Everest Re (EG) 10-K 2 Mar 20 2019 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Feb. 01, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Transition Report	false
Entity File Number	1-15731
Entity Registrant Name	EVEREST RE GROUP, LTD.
Entity Incorporation State Country Code	D0
Entity Tax Identification Number	98-0365432
Entity Address Address Line 1	Seon Place – 4
Entity Address Address Line 2	141 Front Street
Entity Address Address Line 3	PO Box HM 845
Entity Address City Or Town	Hamilton
Entity Address Postal Zip Code	HM 19
Entity Address Country	BM
City Area Code	441
Local Phone Number	295-0006
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 10,070,237
Security 12b Title	Common Shares, $0.01 par value
Trading Symbol	RE
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		40,813,432
Amendment Flag	false
Entity Central Index Key	0001095073
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2019, $16,473,491 ; 2018, $15,406,572 )	$ 16,824,944	$ 15,225,263
Fixed maturities - available for sale, at fair value	5,826	2,337
Equity securities, at fair value	931,457	716,639
Short-term investments (cost: 2019, $414,639 ; 2018, $241,010 )	414,706	240,987
Other invested assets (cost: 2019, $1,763,531 ; 2018, $1,591,745 )	1,763,531	1,591,745
Cash	808,036	656,095
Total investments and cash	20,748,500	18,433,066
Accrued investment income	116,804	104,619
Premiums receivable	2,259,088	2,183,183
Reinsurance receivables	1,763,471	1,787,648
Funds held by reinsureds	489,901	435,031
Deferred acquisition costs	581,863	511,573
Prepaid reinsurance premiums	445,716	343,343
Income taxes	305,711	594,487
Other assets	612,997	358,042
TOTAL ASSETS	27,324,051	24,750,992
LIABILITIES:
Reserve for losses and loss adjustment expenses	13,611,313	13,119,090
Future policy benefit reserve	42,592	46,778
Unearned premium reserve	3,056,735	2,517,612
Funds held under reinsurance treaties	10,668	13,099
Other net payable to reinsurers	291,660	218,439
Loss in course of payment	51,950	85,519
Senior notes due 6/1/2044	397,074	396,954
Long term notes due 5/1/2067	236,758	236,659
Accrued interest on debt and borrowings	2,878	3,093
Equity index put option liability	5,584	11,958
Unsettled securities payable	30,650	51,112
Other liabilities	453,264	189,882
Total liabilities	18,191,126	16,890,195
Commitments and contingencies (Note 15)
SHAREHOLDERS' EQUITY:
Preferred shares, par value
Common shares, par value: $0.01; 200,000 shares authorized; (2019) 69,464 and (2018) 69,202 outstanding before treasury shares	694	692
Additional paid-in capital	2,219,660	2,188,777
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $30,996 at 2019 and ($20,697) at 2018	28,152	(462,557)
Treasury shares, at cost; 28,665 shares (2019) and 28,551 shares (2018)	(3,422,152)	(3,397,548)
Retained earnings	10,306,571	9,531,433
Total shareholders' equity	9,132,925	7,860,797
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 27,324,051	$ 24,750,992

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fixed maturities - available for sale, at market value, amortized cost	$ 16,473,491	$ 15,406,572
Short-term investments, at cost	414,639	241,010
Other invested assets, at cost	$ 1,763,531	$ 1,591,745
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common shares, outstanding	69,464,000	69,202,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit)	$ 30,996	$ (20,697)
Treasury shares	28,665,000	28,551,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt instrument, maturity date	Jun. 1, 2044
6.6 % Long Term Subordinated Notes [Member] | Subordinated Debt [Member]
Debt instrument, maturity date	May 1, 2067

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES:
Premiums earned	$ 7,403,686	$ 6,931,699	$ 5,937,840
Net Investment Income	647,139	581,183	542,898
Other-than-temporary impairments on fixed maturity securities	20,899	8,110	7,093
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income
Other net realized capital gains (losses)	205,903	(119,026)	160,287
Total net realized capital gains (losses)	185,004	(127,136)	153,194
Derivative, Gain (Loss) on Derivative, Net	6,374	520	9,581
Other income (expense)	(11,034)	(24,771)	(21,215)
Total revenues	8,231,169	7,361,495	6,622,298
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	4,922,898	5,651,403	4,522,581
Commission, brokerage, taxes and fees	1,703,726	1,519,030	1,303,963
Other underwriting expenses	440,899	371,541	318,817
Corporate Expenses	32,966	30,672	25,923
Total claims and expenses	7,132,182	7,603,677	6,202,887
INCOME (LOSS) BEFORE TAXES	1,098,987	(242,182)	419,411
Income tax expense (benefit)	89,526	(331,223)	(63,340)
NET INCOME (LOSS)	1,009,461	89,041	482,751
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	496,430	(255,656)	(64,348)
Reclassification adjustment for realized losses (gains) included in net income (loss)	(12,613)	27,496	(6,950)
Total URA(D) on securities arising during the period	483,817	(228,160)	(71,298)
Foreign currency translation adjustments	14,030	(76,816)	121,917
Benefit plan actuarial net gain (loss) for the period	(12,591)	(510)	1,027
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	5,453	5,021	5,477
Total benefit plan net gain (loss) for the period	(7,138)	4,511	6,504
Total other comprehensive income (loss), net of tax	490,709	(300,465)	57,123
COMPREHENSIVE INCOME (LOSS)	$ 1,500,170	$ (211,424)	$ 539,874
EARNINGS PER COMMON SHARE:
Basic	$ 24.77	$ 2.18	$ 11.77
Diluted	$ 24.70	$ 2.17	$ 11.70

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Change to beginning balance due to adoption of Accounting Standards Update 2016-01					$ (1,250)	$ 1,250
Balance at Dec. 31, 2016			$ 689	$ 2,140,783	(216,764)	9,380,653	$ (3,272,244)
Balance, shares at Dec. 31, 2016		40,898,864
Issued during the period, net, shares		172,901
Treasury shares acquired, shares		(236,493)
Issued during the period, net			2
Share-based compensation plans				24,985
Net increase (decrease) during the period	$ 57,123				57,123
Net income (loss)	482,751					482,751
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(207,242)					(207,242)
Purchase of treasury shares							(50,000)
Balance at Dec. 31, 2017	8,340,736		691	2,165,768	(160,891)	9,657,412	(3,322,244)
Balance, shares at Dec. 31, 2017		40,835,272
Change to beginning balance due to adoption of Accounting Standards Update 2016-01					(1,201)	1,201
Net income (loss)	215,186					215,186
Balance at Mar. 31, 2018	8,320,552					9,820,559
Balance at Dec. 31, 2017	8,340,736		691	2,165,768	(160,891)	9,657,412	(3,322,244)
Balance, shares at Dec. 31, 2017		40,835,272
Net income (loss)	275,973					275,973
Balance at Jun. 30, 2018	8,208,613					9,828,106
Balance at Dec. 31, 2017	8,340,736		691	2,165,768	(160,891)	9,657,412	(3,322,244)
Balance, shares at Dec. 31, 2017		40,835,272
Net income (loss)	474,354					474,354
Balance at Sep. 30, 2018	8,289,045					9,973,624
Balance at Dec. 31, 2017	8,340,736		691	2,165,768	(160,891)	9,657,412	(3,322,244)
Balance, shares at Dec. 31, 2017		40,835,272
Issued during the period, net, shares		158,055
Treasury shares acquired, shares		(342,179)
Issued during the period, net			1
Share-based compensation plans				23,009
Net increase (decrease) during the period	(300,465)				(300,465)
Net income (loss)	89,041					89,041
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(216,221)					(216,221)
Purchase of treasury shares							(75,304)
Balance at Dec. 31, 2018	$ 7,860,797		692	2,188,777	(462,557)	9,531,433	(3,397,548)
Balance, shares at Dec. 31, 2018	69,202,000	40,651,148
Balance at Mar. 31, 2018	$ 8,320,552					9,820,559
Net income (loss)	60,787					60,787
Balance at Jun. 30, 2018	8,208,613					9,828,106
Net income (loss)	198,381					198,381
Balance at Sep. 30, 2018	8,289,045					9,973,624
Net income (loss)	(385,313)
Balance at Dec. 31, 2018	$ 7,860,797		692	2,188,777	(462,557)	9,531,433	(3,397,548)
Balance, shares at Dec. 31, 2018	69,202,000	40,651,148
Change to beginning balance due to adoption of Accounting Standards Update 2016-01
Net income (loss)	$ 354,551					354,551
Balance at Mar. 31, 2019	8,389,273					9,828,847
Balance at Dec. 31, 2018	$ 7,860,797		692	2,188,777	(462,557)	9,531,433	(3,397,548)
Balance, shares at Dec. 31, 2018	69,202,000	40,651,148
Net income (loss)	$ 687,419
Balance at Jun. 30, 2019	8,836,817					10,104,716
Balance at Dec. 31, 2018	$ 7,860,797		692	2,188,777	(462,557)	9,531,433	(3,397,548)
Balance, shares at Dec. 31, 2018	69,202,000	40,651,148
Issued during the period, net, shares		262,448
Treasury shares acquired, shares		(114,633)
Issued during the period, net			2
Share-based compensation plans				30,883
Net increase (decrease) during the period	$ 490,709				490,709
Net income (loss)	1,009,461					1,009,461
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(234,322)					(234,322)
Purchase of treasury shares							(24,604)
Balance at Dec. 31, 2019	$ 9,132,925		$ 694	$ 2,219,660	$ 28,152	10,306,571	$ (3,422,152)
Balance, shares at Dec. 31, 2019	69,464,000	40,798,963
Balance at Mar. 31, 2019	$ 8,389,273					9,828,847
Net income (loss)	332,868					332,868
Balance at Jun. 30, 2019	$ 8,836,817					$ 10,104,716

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 5.75	$ 5.30	$ 5.05

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 1,009,461	$ 89,041	$ 482,751
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(62,018)	(382,987)	(350,446)
Decrease (increase) in funds held by reinsureds, net	(56,722)	(153,627)	(33,220)
Decrease (increase) in reinsurance receivables	67,444	(511,592)	(238,485)
Decrease (increase) in income taxes	237,479	(265,065)	(114,077)
Decrease (increase) in prepaid reinsurance premiums	(95,207)	(65,925)	(86,049)
Increase (decrease) in reserve for losses and loss adjustment expenses	402,380	1,377,711	1,376,321
Increase (decrease) in future policy benefit reserve	(4,186)	(4,236)	(4,060)
Increase (decrease) in unearned premiums	521,709	542,023	401,174
Increase (decrease) in other net payable to reinsurers	66,477	12,276	10,071
Increase (decrease) in losses in course of payment	(33,557)	123,209	(105,371)
Change in equity adjustments in limited partnerships	(108,332)	(102,052)	(82,713)
Distribution of limited partnership income	81,300	84,623	50,825
Change in other assets and liabilities, net	(54,176)	(322,107)	(66,998)
Non-cash compensation expense	34,018	32,369	30,297
Amortization of bond premium (accrual of bond discount)	30,936	29,272	45,867
Net realized capital (gains) losses	(185,004)	127,136	(153,194)
Net cash provided by (used in) operating activities	1,852,002	610,069	1,162,693
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	2,302,299	1,973,652	2,160,298
Proceeds from fixed maturities sold - available for sale, at market value	3,280,237	3,148,428	2,401,844
Proceeds from fixed maturities sold - available for sale, at fair value	2,917	1,751
Proceeds from equity securities sold, at market value			19,574
Proceeds from equity securities sold, at fair value	283,965	1,199,409	631,859
Distributions from other invested assets	284,558	3,102,018	5,579,043
Cost of fixed maturities acquired - available for sale, at market value	(6,613,917)	(5,909,504)	(5,131,098)
Cost of fixed maturities acquired - available for sale, at fair value	(4,243)	(4,381)
Cost of equity securities acquired, at market value			(22,033)
Cost of equity securities acquired, at fair value	(329,417)	(921,937)	(438,641)
Cost of other invested assets acquired	(425,438)	(3,370,455)	(5,829,271)
Net change in short-term investments	(167,290)	455,350	(73,923)
Net change in unsettled securities transactions	(26,163)	46,048	(30,229)
Net cash provided by (used in) investing activities	(1,412,492)	(279,621)	(732,577)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period for share-based compensation, net of expense	(3,134)	(8,157)	(5,310)
Purchase of treasury shares	(24,604)	(75,304)	(50,000)
Dividends paid to shareholders	(234,322)	(216,221)	(207,242)
Cost of shares withheld on settlements of share-based compensation awards	(13,627)	(16,912)	(12,906)
Net cash provided by (used in) financing activities	(275,687)	(316,594)	(275,458)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(11,882)	7,174	(1,513)
Net increase (decrease) in cash	151,941	21,028	153,145
Cash, beginning of period	656,095	635,067	481,922
Cash, end of period	808,036	656,095	635,067
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	(148,585)	(65,064)	164,856
Interest paid	31,689	30,447	35,973
NON-CASH TRANSACTIONS:
Fixed maturities - available for sale, at market value		143,656
Short-term investments		243,864
Other invested assets		$ (387,520)

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES A. Business and Basis of Presentation. Everest Re Group, Ltd. (“Group”), a Bermuda company, through its subsidiaries, principally provides reinsurance and insurance in the U.S., Bermuda and international markets. As used in this document, “Company” means Group and its subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The statements include all of the following domestic and foreign direct and indirect subsidiaries of Group: Everest International Reinsurance, Ltd. (“Everest International”), Mt. Logan Insurance Managers, Ltd., Mt. Logan Management, Ltd., Everest International Holdings (Bermuda), Ltd. (“International Holdings”), Everest Corporate Member Limited, Everest Service Company (UK), Ltd., Everest Preferred International Holdings, Ltd. (“Preferred International”), Everest Reinsurance (Bermuda), Ltd. (“Bermuda Re”), Everest Re Advisors, Ltd., Everest Advisors (UK), Ltd., Everest Underwriting Group (Ireland), Limited (“Holdings Ireland”), Everest Global Services, Inc. (“Global Services”), Everest Insurance Company of Canada (“Everest Canada”), Premiere Insurance Underwriting Services (“Premiere”), Everest Dublin Insurance Holdings Limited (Ireland) (“Everest Dublin Holdings”), Everest Insurance (Ireland), designated activity company (“Ireland Insurance”), Everest Reinsurance Company (Ireland), designated activity company (“Ireland Re”), Everest Reinsurance Holdings, Inc. (“Holdings”), Salus Systems, LLC (“Salus”), Everest International Assurance, Ltd. (Bermuda) (“Everest Assurance”), Specialty Insurance Group, Inc. (“Specialty”), Specialty Insurance Group - Leisure and Entertainment Risk Purchasing Group LLC (“Specialty RPG”), Mt. McKinley Managers, L.L.C., Everest Specialty Underwriters Services, LLC, Everest Reinsurance Company (“Everest Re”), Everest National Insurance Company (“Everest National”), Everest Reinsurance Company Ltda. (Brazil), Mt. Whitney Securities, Inc., Everest Indemnity Insurance Company (“Everest Indemnity”), Everest Denali Insurance Company (“Everest Denali”), Everest Premier Insurance Company (“Everest Premier”) and Everest Security Insurance Company (“Everest Security”). All amounts are reported in U.S. dollars. The Company consolidates the results of operations and financial position of all voting interest entities ("VOE") in which the Company has a controlling financial interest and all variable interest entities ("VIE") in which the Company is considered to have control and be the primary beneficiary. The consolidation assessment, including the determination as to whether an entity qualifies as a VIE or VOE, depends on the facts and circumstances surrounding each entity. Effective January 1, 2016, the Company adopted Accounting Standards Update (“ASU”) 2015-02, “Consolidation (Topic 810) Amendments to the Consolidation Analysis” issued by the United States Financial Accounting Standards Board (“FASB”), which changed the method in which the Company determines whether entities are consolidated by the Company. The adoption of this amended accounting guidance was implemented utilizing a full retrospective application for prior periods. The amended guidance includes changes in the identification of the primary beneficiary of companies considered to be VIEs. These changes resulted in the Company concluding that Mt. Logan Re, Ltd. (Bermuda) (“Mt. Logan Re”) is a VIE given it has insufficient equity at risk and that each underlying separate segregated account is likewise a VIE. The Company has concluded that it is the primary beneficiary of Mt. Logan Re, but not of the underlying separate segregated accounts and therefore has deconsolidated these segregated accounts. This change had no impact to the net income or retained earnings of the Company. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Ultimate actual results could differ, possibly materially, from those estimates. All intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior years’ amounts to conform to the 2019 presentation. B. Investments. Fixed maturity investments available for sale, at market value, reflect unrealized appreciation and depreciation, as a result of temporary changes in market value during the period, in shareholders’ equity, net of income taxes in “accumulated other comprehensive income (loss)” in the consolidated balance sheets. Fixed maturity and equity securities carried at fair value reflect fair value re-measurements as net realized capital gains and losses in the consolidated statements of operations and comprehensive income (loss). The Company records changes in fair value for its fixed maturities available for sale, at market value through shareholders’ equity, net of taxes in accumulated other comprehensive income (loss) since cash flows from these investments will be primarily used to settle its reserve for losses and loss adjustment expense liabilities. The Company anticipates holding these investments for an extended period as the cash flow from interest and maturities will fund the projected payout of these liabilities. As of January 1, 2018, the Company carries all of its equity securities at fair value. For equity securities, at fair value, the Company reflects changes in value as net realized capital gains and losses since these securities may be sold in the near term depending on financial market conditions. Interest income on all fixed maturities and dividend income on all equity securities are included as part of net investment income in the consolidated statements of operations and comprehensive income (loss). Unrealized losses on fixed maturities, which are deemed other-than-temporary and related to the credit quality of a security, are charged to net income (loss) as net realized capital losses. Short-term investments are stated at cost, which approximates market value. Realized gains or losses on sales of investments are determined on the basis of identified cost. For some non-publicly traded securities, market prices are determined through the use of pricing models that evaluate securities relative to the U.S. Treasury yield curve, taking into account the issue type, credit quality, and cash flow characteristics of each security. For other non-publicly traded securities, investment managers’ valuation committees will estimate fair value and in many instances, these fair values are supported with opinions from qualified independent third parties. All fair value estimates from investment managers are reviewed by the Company for reasonableness. For publicly traded securities, market value is based on quoted market prices or valuation models that use observable market inputs. When a sector of the financial markets is inactive or illiquid, the Company may use its own assumptions about future cash flows and risk-adjusted discount rates to determine fair value. Retrospective adjustments are employed to recalculate the values of asset-backed securities. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used to effect the calculation of projected and prepayments for pass-through security types. Other invested assets include limited partnerships, rabbi trusts and prior to July 1, 2018, a private placement liquidity sweep facility. Cash contributions to and cash distributions from the sweep facility were reported gross in cash flows from investing activities in the consolidated statements of cash flows. Limited partnerships are accounted for under the equity method of accounting, which can be recorded on a monthly or quarterly lag. C. Uncollectible Receivable Balances. The Company provides reserves for uncollectible reinsurance recoverable and premium receivable balances based on management’s assessment of the collectability of the outstanding balances. Such reserves are presented in the table below for the periods indicated. Years Ended December 31, (Dollars in thousands) 2019 2018 Reinsurance receivables and premium receivables $ 25,605 25,611 D. Deferred Acquisition Costs. Acquisition costs, consisting principally of commissions and brokerage expenses and certain premium taxes and fees incurred at the time a contract or policy is issued and that vary with and are directly related to the Company’s reinsurance and insurance business, are deferred and amortized over the period in which the related premiums are earned. Deferred acquisition costs are limited to their estimated realizable value by line of business based on the related unearned premiums, anticipated claims and claim expenses and anticipated investment income. Deferred acquisition costs amortized to income are presented in the table below for the periods indicated. Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Deferred acquisition costs $ 1,703,726 $ 1,519,030 $ 1,303,963 E. Reserve for Losses and Loss Adjustment Expenses. The reserve for losses and loss adjustment expenses (“LAE”) is based on individual case estimates and reports received from ceding companies. A provision is included for losses and LAE incurred but not reported (“IBNR”) based on past experience. A provision is also included for certain potential liabilities relating to asbestos and environmental (“A&E”) exposures, for which liabilities cannot be estimated using traditional reserving techniques. See also Note 3. The reserves are reviewed periodically and any changes in estimates are reflected in earnings in the period the adjustment is made. The Company’s loss and LAE reserves represent management’s best estimate of the ultimate liability. Loss and LAE reserves are presented gross of reinsurance receivables and incurred losses and LAE are presented net of reinsurance. Accruals for commissions are established for reinsurance contracts that provide for the stated commission percentage to increase or decrease based on the loss experience of the contract. Changes in estimates for such arrangements are recorded as commission expense. Commission accruals for contracts with adjustable features are estimated based on expected loss and LAE. F. Future Policy Benefit Reserve. Liabilities for future policy benefits on annuity policies are carried at their accumulated values. Reserves for policy benefits include mortality claims in the process of settlement and IBNR claims. Actual experience in a particular period may fluctuate from expected results. G. Premium Revenues. Written premiums are earned ratably over the periods of the related insurance and reinsurance contracts. Unearned premium reserves are established relative to the unexpired contract period. For reinsurance contracts, such reserves are established based upon reports received from ceding companies or estimated using pro rata methods based on statistical data. Reinstatement premiums represent additional premium received on reinsurance coverages, most prevalently catastrophe related, when limits have been depleted under the original reinsurance contract and additional coverage is granted. Written and earned premiums and the related costs, which have not yet been reported to the Company, are estimated and accrued. Premiums are net of ceded reinsurance. H. Prepaid Reinsurance Premiums. Prepaid reinsurance premiums represent unearned premium reserves ceded to other reinsurers. Prepaid reinsurance premiums for any foreign reinsurers comprising more than 10% of the outstanding balance at December 31, 2019 were secured either through collateralized trust arrangements, rights of offset or letters of credit, thereby limiting the credit risk to the Company. I. Income Taxes. Holdings and its wholly-owned subsidiaries file a consolidated U.S. federal income tax return. Foreign subsidiaries and branches of subsidiaries file local tax returns as required. Group and subsidiaries not included in Holdings’ consolidated tax return file separate company U.S. federal income tax returns as required. Deferred income taxes have been recorded to recognize the tax effect of temporary differences between the financial reporting and income tax bases of assets and liabilities, which arise because of differences between GAAP and income tax accounting rules. J. Foreign Currency. As a global entity, the Company transacts business in numerous currencies through business units located around the world. The base transactional currency for each business unit is determined by the local currency used for most economic activity in that area. Movements in exchange rates related to assets and liabilities at the business units between the original currency and the base currency are recorded through the consolidated statements of operations and comprehensive income (loss) in other income (expense), except for currency movements related to available for sale investments, which are excluded from net income (loss) and accumulated in shareholders’ equity, net of deferred taxes. The business units’ base currency financial statements are translated to U.S. dollars using the exchange rates at the end of period for the balance sheets and the average exchange rates in effect for the reporting period for the income statements. Gains and losses resulting from translating the foreign currency financial statements, net of deferred income taxes, are excluded from net income loss and accumulated in shareholders’ equity. K. Earnings Per Common Share. Basic earnings per share are calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if options granted under various share-based compensation plans were exercised resulting in the issuance of common shares that would participate in the earnings of the entity. Net income (loss) per common share has been computed as per below, based upon weighted average common basic and dilutive shares outstanding. Years Ended December 31, (Dollars in thousands, except per share amounts) 2019 2018 2017 Net income (loss) per share: Numerator Net income (loss) $ 1,009,461 $ 89,041 $ 482,751 Less: dividends declared-common shares and nonvested common shares ( 234,322) ( 216,221) ( 207,242) Undistributed earnings 775,139 ( 127,180) 275,508 Percentage allocated to common shareholders (1) 98.9 % 99.0 % 98.9 % 766,386 ( 125,848) 272,589 Add: dividends declared-common shareholders 231,796 214,088 205,182 Numerator for basic and diluted earnings per common share $ 998,182 $ 88,239 $ 477,771 Denominator Denominator for basic earnings per weighted-average common shares 40,291 40,388 40,595 Effect of dilutive securities: Options 129 198 248 Denominator for diluted earnings per adjusted weighted-average common shares 40,420 40,586 40,843 Per common share net income (loss) Basic $ 24.77 $ 2.18 $ 11.77 Diluted $ 24.70 $ 2.17 $ 11.70 (1) Basic weighted-average common shares outstanding 40,291 40,388 40,595 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,751 40,816 41,030 Percentage allocated to common shareholders 98.9 % 99.0 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no anti-diluted options outstanding for the years ended December 31, 2019, 2018 and 2017. All outstanding options expire on or between February 24, 2020 and September 19, 2022. L. Segmentation. The Company, through its subsidiaries, operates in four segments: U.S. Reinsurance, International, Bermuda and Insurance. See also Note 17. M. Derivatives. The Company sold seven equity index put option contracts, based on two indices, in 2001 and 2005. The Company sold these equity index put options as insurance products with the intent of achieving a profit. These equity index put option contracts meet the definition of a derivative under FASB guidance and the Company’s position in these equity index put option contracts is unhedged. Accordingly, these equity index put option contracts are carried at fair value in the consolidated balance sheets with changes in fair value recorded in the consolidated statements of operations and comprehensive income (loss). As of December 31, 2019, four of these contracts had already expired, with no liability due under the terms of the contract. The fair value of the equity index put options can be found in the Company’s consolidated balance sheets as follows: (Dollars in thousands) Derivatives not designated as Location of fair value At December 31, hedging instruments in balance sheets 2019 2018 Equity index put option contracts Equity index put option liability $ 5,584 $ 11,958 Total $ 5,584 $ 11,958 The change in fair value of the equity index put option contracts can be found in the Company’s statement of operations and comprehensive income (loss) as follows: (Dollars in thousands) Location of gain (loss) in statements of operations and comprehensive income (loss) For the Years Ended December 31, Derivatives not designated as hedging instruments 2019 2018 2017 Equity index put option contracts Net derivative gain (loss) $ 6,374 $ 520 $ 9,581 Total $ 6,374 $ 520 $ 9,581 N. Deposit Assets and Liabilities. In the normal course of its operations, the Company may enter into contracts that do not meet risk transfer provisions. Such contracts are accounted for using the deposit accounting method and are included in other liabilities in the Company’s consolidated balance sheets. For such contracts, the Company originally records deposit liabilities for an amount equivalent to the assets received. Actuarial studies are used to estimate the final liabilities under such contracts with any change reflected in the consolidated statements of operations and comprehensive income (loss). O. Share-Based Compensation. Share-based compensation stock option, restricted share and performance share unit awards are fair valued at the grant date and expensed over the vesting period of the award. The tax benefit on the recorded expense is deferred until the time the award is exercised or vests (becomes unrestricted). See Note 16. P. Application of Recently Issued Accounting Guidance. Accounting for Income Taxes . In December 2019, The Financial Accounting Standards Board (“FASB”) issued ASU 2019-12, which provides simplification of existing guidance for income taxes, including the removal of certain exceptions related to recognition of deferred tax liabilities on foreign subsidiaries. The guidance is effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. The Company is currently evaluating the impact of the adoption of ASU 2019-12 on its financial statements. Simplification of Disclosure Requirements. In August 2018, the Securities and Exchange Commission (“SEC”) issued Final Rule Release #33-10532 (“the Rule”) which addresses the simplification of the SEC’s disclosure requirements for quarterly and annual financial reports. The main changes addressed by the Rule that are applicable to the Company are 1) elimination of the requirement to disclose dividend per share information on the face of the Statements of Operations and Comprehensive Income (Loss) and 2) a new requirement to disclose changes in equity by line item with subtotals for each interim reporting period on the Statements of Changes in Shareholders’ Equity. The Rule became effective for all financial reports filed after November 5, 2018 (30 days after its publication in the Federal Register), except for the additional requirement for the Statements of Changes in Shareholders’ Equity which was to be implemented for first quarter 2019 reporting. The Company has adopted the portions of the Rule that became effective November 5, 2018. The portion of the Rule related to the new requirement for the Statements of Changes in Shareholders’ Equity was adopted by the Company in the first quarter of 2019. Accounting for Cloud Computing Arrangement. In August 2018, FASB issued ASU 2018-15, which outlines accounting for implementation costs of a cloud computing arrangement that is a service contract. This guidance requires that implementation costs of a cloud computing arrangement that is a service contract must be capitalized and expensed in accordance with the existing provisions provided in Subtopic 350-40 regarding development of internal use software. In addition, any capitalized implementation costs should be amortized over the term of the hosting arrangement. The guidance is effective for annual reporting periods beginning after December 15, 2019 and interim periods within that annual reporting period. The Company does not expect the adoption of ASU 2018-15 to have a material impact on its financial statements. Accounting for Long Duration Contracts. In August 2018, FASB issued ASU 2018-12, which discusses changes to the recognition, measurement and presentation of long duration contracts. The main provisions of this guidance address the following: 1) In determining liability for future policy benefits, companies must review cash flow assumptions at least annually and the discount rate assumption at each reporting period date 2) Amortization of deferred acquisition costs has been simplified to be in constant level proportion to either premiums, gross profits or gross margins 3) Disaggregated roll forwards of beginning and ending liabilities for future policy benefits are required. The guidance was originally effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. However, FASB issued ASU 2019-09 in November 2019 which defers the effective date of ASU 2018-12 until annual reporting periods beginning after December 15, 2021. The Company is currently evaluating the impact of the adoption of ASU 2018-12 on its financial statements. Accounting for Deferred Taxes in Accumulated Other Comprehensive Income (AOCI). In February 2018, FASB issued ASU 2018-02 which outlines guidance on the treatment of trapped deferred taxes contained within AOCI on the consolidated balance sheets. The new guidance allows the amount of trapped deferred taxes in AOCI, resulting from the change in the U.S. tax rate from 35% to 21% upon enactment of the Tax Cuts and Jobs Act (“TCJA”), to be reclassified as part of retained earnings in the consolidated balance sheets. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018, but early adoption is allowed. The Company decided to early adopt the guidance as of December 31, 2017. The adoption resulted in a reclass of $ 1,250 thousand between AOCI and retained earnings during the fourth quarter of 2017. As an accounting policy, the Company has adopted the aggregate portfolio approach for releasing disproportionate income tax effects from AOCI. Accounting for Impact on Income Taxes due to Tax Reform. In December 2017, the SEC issued Staff Accounting Bulletin (“SAB”) 118 which provides guidance on the application of FASB Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, due to the enactment of TCJA. SAB 118 became effective upon release. The Company has adopted the provisions of SAB 118 with respect to measuring the tax effects for the modifications to the determination of tax basis loss reserves. In 2018, the Company recorded adjustments to the amount of tax expense it recorded in 2017 with respect to the TCJA as estimated amounts were finalized, which did not have a material impact on the Company’s financial statements. Amortization of Bond Premium. In March 2017, FASB issued ASU 2017-08 which outlines guidance on the amortization period for premium on callable debt securities. The new guidance requires that the premium on callable debt securities be amortized through the earliest call date rather than through the maturity date of the callable security. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018. The adoption of ASU 2017-08 did not have a material impact on the Company’s financial statements. Presentation and Disclosure of Net Periodic Benefit Costs. In March 2017, FASB issued ASU 2017-07 which outlines guidance on the presentation of net periodic costs of benefit plans. The new guidance requires that the service cost component of net periodic benefit costs be reported within the same line item of the statements of operations as other compensation costs are reported. Other components of net periodic benefit costs should be reported separately. Footnote disclosure is required to state within which line items of the statements of operations the components are reported. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2017-07 did not have a material impact on the Company’s financial statements. Disclosure of Restricted Cash. In November 2016, FASB issued ASU 2016-18 and in August 2016, FASB issued ASU 2016-15 which outline guidance on the presentation in the statements of cash flows of changes in restricted cash. The new guidance requires that the statements of cash flows should reflect all changes in cash, cash equivalents and restricted cash in total and not segregated individually. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-18 and ASU 2016-15 did not have a material impact on the Company’s financial statements. Intra-Entity Asset Transfers. In October 2016, FASB issued ASU 2016-16 which outlines guidance on the tax accounting for intra-entity asset sales and transfers, other than inventory. The new guidance requires that reporting entities recognize tax expense from the intra-entity transfer of an asset in the seller’s tax jurisdiction at the time of transfer and recognize any deferred tax asset in the buyer’s tax jurisdiction at the time of transfer. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-16 did not have a material impact on the Company’s financial statements. Valuation of Financial Instruments. In June 2016, FASB issued ASU 2016-13 (and has subsequently issued related guidance and amendments in ASU 2019-11 and ASU 2019-10 in November 2019) which outline guidance on the valuation of and accounting for assets measured at amortized cost and available for sale debt securities. The carrying value of assets measured at amortized cost will now be presented as the amount expected to be collected on the financial asset (amortized cost less an allowance for credit losses valuation account). Available for sale debt securities will now record credit losses through an allowance for credit losses, which will be limited to the amount by which fair value is below amortized cost. The guidance is effective for annual and interim reporting periods beginning after December 15, 2019. The Company does not expect the adoption of ASU 2016-13, 2019-11 and 2019-10 to have a material impact on its financial statements. Accounting for Share-Based Compensation. In March 2016, the FASB issued ASU 2016-09, authoritative guidance regarding the accounting for share-based compensation. This guidance requires that the income tax effects resulting from the change in the value of share-based compensation awards between grant and settlement will be recorded as part of the consolidated statements of operations and comprehensive income/(loss). Previously, excess tax benefits have been recorded as part of the additional paid in capital within the consolidated balance sheets. The guidance is effective for annual reporting periods beginning after December 15, 2016 and interim periods within that annual reporting period. The Company has implemented this guidance prospectively as of January 1, 2017. The guidance also requires that the cost of employee taxes paid via shares withheld upon settlement of share-based compensation awards must be shown as a financing activity within the Statements of Cash Flows. The Company has implemented this guidance retrospectively as of January 1, 2017.

Investments

Investments	12 Months Ended
	Dec. 31, 2019
Investments [Abstract]
Investments	2. INVESTMENTS The amortized cost, market value and gross unrealized appreciation and depreciation of available for sale, fixed maturity, equity security investments, carried at market value and other-than-temporary impairments (“OTTI”) in accumulated other comprehensive income (“AOCI”) are as follows for the periods indicated: At December 31, 2019 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,489,660 $ 28,357 $ ( 2,214) $ 1,515,803 $ - Obligations of U.S. states and political subdivisions 507,353 29,651 ( 89) 536,915 - Corporate securities 6,227,661 185,052 ( 37,767) 6,374,946 469 Asset-backed securities 892,373 6,818 ( 1,858) 897,333 - Mortgage-backed securities Commercial 814,570 31,236 ( 1,249) 844,557 - Agency residential 2,173,099 36,361 ( 10,879) 2,198,581 - Non-agency residential 5,723 - ( 20) 5,703 - Foreign government securities 1,492,315 47,148 ( 33,513) 1,505,950 71 Foreign corporate securities 2,870,737 107,999 ( 33,580) 2,945,156 447 Total fixed maturity securities $ 16,473,491 $ 472,622 $ ( 121,169) $ 16,824,944 $ 987 At December 31, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,629,454 $ 16,781 $ ( 15,101) $ 2,631,134 $ - Obligations of U.S. states and political subdivisions 490,018 12,915 ( 2,839) 500,094 439 Corporate securities 5,538,582 48,465 ( 141,515) 5,445,532 1,688 Asset-backed securities 545,427 162 ( 5,492) 540,097 - Mortgage-backed securities Commercial 329,883 2,167 ( 5,340) 326,710 - Agency residential 1,832,760 7,325 ( 43,821) 1,796,264 - Non-agency residential 10,198 37 ( 26) 10,209 - Foreign government securities 1,335,328 34,743 ( 55,906) 1,314,165 98 Foreign corporate securities 2,694,922 63,994 ( 97,858) 2,661,058 320 Total fixed maturity securities $ 15,406,572 $ 186,589 $ ( 367,898) $ 15,225,263 $ 2,545 (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date. The amortized cost and market value of fixed maturity securities are shown in the following table by contractual maturity. Mortgage-backed securities are generally more likely to be prepaid than other fixed maturity securities. As the stated maturity of such securities may not be indicative of actual maturities, the totals for mortgage-backed and asset-backed securities are shown separately. At December 31, 2019 At December 31, 2018 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,456,960 $ 1,457,919 $ 1,328,571 $ 1,330,534 Due after one year through five years 6,757,107 6,869,359 8,114,247 8,016,490 Due after five years through ten years 3,471,370 3,609,816 2,455,911 2,413,846 Due after ten years 902,289 941,676 789,575 791,113 Asset-backed securities 892,373 897,333 545,427 540,097 Mortgage-backed securities: Commercial 814,570 844,557 329,883 326,710 Agency residential 2,173,099 2,198,581 1,832,760 1,796,264 Non-agency residential 5,723 5,703 10,198 10,209 Total fixed maturity securities $ 16,473,491 $ 16,824,944 $ 15,406,572 $ 15,225,263 The changes in net unrealized appreciation (depreciation) for the Company’s investments are derived from the following sources for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 534,410 $ ( 247,497) Fixed maturity securities, other-than-temporary impairment ( 1,559) ( 1,071) Change in unrealized appreciation (depreciation), pre-tax 532,851 ( 248,568) Deferred tax benefit (expense) ( 49,149) 20,543 Deferred tax benefit (expense), other-than-temporary impairment 115 ( 135) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ 483,817 $ ( 228,160) The Company frequently reviews all of its fixed maturity, available for sale securities for declines in market value and focuses its attention on securities whose fair value has fallen below 80% of their amortized cost at the time of review. The Company then assesses whether the decline in value is temporary or other-than-temporary. In making its assessment, the Company evaluates the current market and interest rate environment as well as specific issuer information. Generally, a change in a security’s value caused by a change in the market, interest rate or foreign exchange environment does not constitute an other-than-temporary impairment, but rather a temporary decline in market value. Temporary declines in market value are recorded as unrealized losses in accumulated other comprehensive income (loss). If the Company determines that the decline is other-than-temporary and the Company does not have the intent to sell the security; and it is more likely than not that the Company will not have to sell the security before recovery of its cost basis, the carrying value of the investment is written down to fair value. The fair value adjustment that is credit or foreign exchange related is recorded in net realized capital gains (losses) in the Company’s consolidated statements of operations and comprehensive income (loss). The fair value adjustment that is non-credit related is recorded as a component of other comprehensive income (loss), net of tax, and is included in accumulated other comprehensive income (loss) in the Company’s consolidated balance sheets. The Company’s assessments are based on the issuers’ current and expected future financial position, timeliness with respect to interest and/or principal payments, speed of repayments and any applicable credit enhancements or breakeven constant default rates on mortgage-backed and asset-backed securities, as well as relevant information provided by rating agencies, investment advisors and analysts. Retrospective adjustments are employed to recalculate the values of asset-backed securities. All of the Company’s asset-backed and mortgage-backed securities have a pass-through structure. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used in the calculation of projected prepayments for pass-through security types. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at December 31, 2019 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 85,527 $ ( 1,005) $ 249,371 $ ( 1,209) $ 334,898 $ ( 2,214) Obligations of U.S. states and political subdivisions 4,600 ( 38) 5,522 ( 51) 10,122 ( 89) Corporate securities 547,120 ( 9,877) 395,369 ( 27,890) 942,489 ( 37,767) Asset-backed securities 176,222 ( 1,027) 94,190 ( 831) 270,412 ( 1,858) Mortgage-backed securities Commercial 83,127 ( 689) 23,063 ( 560) 106,190 ( 1,249) Agency residential 344,267 ( 1,834) 488,680 ( 9,045) 832,947 ( 10,879) Non-agency residential 332 - 3,976 ( 20) 4,308 ( 20) Foreign government securities 210,766 ( 4,770) 283,648 ( 28,743) 494,414 ( 33,513) Foreign corporate securities 278,403 ( 7,553) 365,808 ( 26,027) 644,211 ( 33,580) Total fixed maturity securities $ 1,730,364 $ ( 26,793) $ 1,909,627 $ ( 94,376) $ 3,639,991 $ ( 121,169) Duration of Unrealized Loss at December 31, 2019 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 67,879 $ ( 1,237) $ 416,583 $ ( 23,004) $ 484,462 $ ( 24,241) Due in one year through five years 464,753 ( 7,960) 689,195 ( 38,138) 1,153,948 ( 46,098) Due in five years through ten years 495,741 ( 12,388) 103,612 ( 11,100) 599,353 ( 23,488) Due after ten years 98,043 ( 1,658) 90,328 ( 11,678) 188,371 ( 13,336) Asset-backed securities 176,222 ( 1,027) 94,190 ( 831) 270,412 ( 1,858) Mortgage-backed securities 427,726 ( 2,523) 515,719 ( 9,625) 943,445 ( 12,148) Total fixed maturity securities $ 1,730,364 $ ( 26,793) $ 1,909,627 $ ( 94,376) $ 3,639,991 $ ( 121,169) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2019 were $ 3,639,991 thousand and $ 121,169 thousand, respectively. The market value of securities for the single issuer whose securities comprised the largest unrealized loss position at December 31, 2019, did not exceed 0.8% of the overall market value of the Company’s fixed maturity securities. In addition, as indicated on the above table, there was no significant concentration of unrealized losses in any one market sector. The $ 26,793 thousand of unrealized losses related to fixed maturity securities that have been in an unrealized loss position for less than one year were generally comprised of domestic and foreign corporate securities and foreign government securities. Of these unrealized losses, $ 23,104 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. The $ 94,376 thousand of unrealized losses related to fixed maturity securities in an unrealized loss position for more than one year related primarily to foreign and domestic corporate securities, foreign government securities and agency residential mortgage-backed securities. Of these unrealized losses, $ 73,144 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. There was no The Company, given the size of its investment portfolio and capital position, does not have the intent to sell these securities; and it is more likely than not that the Company will not have to sell the security before recovery of its cost basis. In addition, all securities currently in an unrealized loss position are current with respect to principal and interest payments. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at December 31, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 76,226 $ ( 158) $ 777,409 $ ( 14,943) $ 853,635 $ ( 15,101) Obligations of U.S. states and political subdivisions 71,559 ( 1,444) 38,105 ( 1,395) 109,664 ( 2,839) Corporate securities 2,513,463 ( 69,619) 1,683,729 ( 71,896) 4,197,192 ( 141,515) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities Commercial 71,167 ( 1,128) 154,201 ( 4,212) 225,368 ( 5,340) Agency residential 156,930 ( 975) 1,373,629 ( 42,846) 1,530,559 ( 43,821) Non-agency residential 10,174 ( 26) - - 10,174 ( 26) Foreign government securities 196,303 ( 9,719) 494,156 ( 46,187) 690,459 ( 55,906) Foreign corporate securities 939,808 ( 35,023) 782,405 ( 62,835) 1,722,213 ( 97,858) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898) Duration of Unrealized Loss at December 31, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 454,239 $ ( 2,558) $ 427,513 $ ( 20,675) $ 881,752 $ ( 23,233) Due in one year through five years 2,014,704 ( 45,148) 2,764,981 ( 129,940) 4,779,685 ( 175,088) Due in five years through ten years 1,082,568 ( 51,300) 492,216 ( 34,210) 1,574,784 ( 85,510) Due after ten years 245,848 ( 16,957) 91,094 ( 12,431) 336,942 ( 29,388) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities 238,271 ( 2,129) 1,527,830 ( 47,058) 1,766,101 ( 49,187) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2018 were $ 9,814,849 thousand and $ 367,898 thousand, respectively. The market value of securities for the single issuer (the United States government) whose securities comprised the largest unrealized loss position at December 31, 2018, did not exceed 5.7% of the overall market value of the Company’s fixed maturity securities. The market value of the securities for the issuer with the second largest unrealized loss comprised less than 1.0% of the Company’s fixed maturity securities. In addition, as indicated on the above table, there was no significant concentration of unrealized losses in any one market sector. The $ 120,838 thousand of unrealized losses related to fixed maturity securities that have been in an unrealized loss position for less than one year were generally comprised of domestic and foreign corporate securities, foreign government securities and asset-backed securities. Of these unrealized losses, $ 74,729 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. The $ 247,060 thousand of unrealized losses related to fixed maturity securities in an unrealized loss position for more than one year related primarily to domestic and foreign corporate securities, foreign government securities, agency residential mortgage-backed securities and U.S. government agencies and corporations. Of these unrealized losses, $ 230,560 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. There was no The components of net investment income are presented in the table below for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Fixed maturities $ 520,291 $ 465,793 $ 427,379 Equity securities 19,505 25,327 34,523 Short-term investments and cash 17,619 14,395 4,177 Other invested assets Limited partnerships 105,815 93,327 83,569 Other 14,117 16,960 10,125 Gross investment income before adjustments 677,347 615,802 559,773 Funds held interest income (expense) 13,271 6,300 11,874 Future policy benefit reserve income (expense) ( 1,380) ( 1,419) ( 1,282) Gross investment income 689,238 620,683 570,365 Investment expenses ( 42,099) ( 39,500) ( 27,467) Net investment income $ 647,139 $ 581,183 $ 542,898 The Company records results from limited partnership investments on the equity method of accounting with changes in value reported through net investment income. Due to the timing of receiving financial information from these partnerships, the results are generally reported on a one month or quarter lag. If the Company determines there has been a significant decline in value of a limited partnership during this lag period, a loss will be recorded in the period in which the Company identifies the decline. The Company had contractual commitments to invest up to an additional $ 1,016,811 thousand in limited partnerships and private placement loans at December 31, 2019. These commitments will be funded when called in accordance with the partnership and loan agreements, which have investment periods that expire, unless extended, through 2026 Beginning in 2016, the Company participated in a private placement liquidity sweep facility (“the facility”). The primary purpose of the facility is to enhance the Company’s return on its short-term investments and cash positions. The facility invests in high quality, short-duration securities and permits daily liquidity. Through the second quarter of 2018, the Company’s participation in the facility was classified within other invested assets on the Company’s Balance Sheets. Starting in the third quarter of 2018, the Company consolidated its participation in the facility. As a result of the consolidation of the underlying investments of the facility, effective July 1, 2018, the Company reclassified $ 143,656 thousand from other invested assets to fixed maturity securities, available for sale, at market value and reclassified $ 243,864 thousand from other invested assets to short-term investments. As of December 31, 2019, the market value of investments in the facility consolidated within the Company’s balance sheets was $ 308,711 thousand. The components of net realized capital gains (losses) are presented in the table below for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Fixed maturity securities, market value: Other-than-temporary impairments $ ( 20,899) $ ( 8,110) $ ( 7,093) Gains (losses) from sales 28,025 ( 21,719) 17,714 Fixed maturity securities, fair value: Gains (losses) from sales 355 ( 1,799) - Gains (losses) from fair value adjustments 1,808 1,506 - Equity securities, market value: Gains (losses) from sales - - ( 3,424) Equity securities, fair value: Gains (losses) from sales 4,148 ( 29,941) 6,969 Gains (losses) from fair value adjustments 165,200 ( 68,832) 138,973 Other invested assets 6,003 1,815 61 Short-term investments gain (loss) 364 ( 56) ( 6) Total net realized capital gains (losses) $ 185,004 $ ( 127,136) $ 153,194 The Company recorded as net realized capital gains (losses) in the consolidated statements of operations and comprehensive income (loss) both fair value re-measurements and write-downs in the value of securities deemed to be impaired on an other-than-temporary basis as displayed in the table above. The Company had no other-than-temporary impaired securities where the impairment had both a credit and non-credit component. The proceeds and split between gross gains and losses, from sales of fixed maturity and equity securities, are presented in the table below for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Proceeds from sales of fixed maturity securities $ 3,283,154 $ 3,150,179 $ 2,401,844 Gross gains from sales 63,721 33,996 58,589 Gross losses from sales ( 35,341) ( 57,514) ( 40,875) Proceeds from sales of equity securities $ 283,965 $ 1,199,409 $ 651,433 Gross gains from sales 14,274 31,718 24,809 Gross losses from sales ( 10,126) ( 61,659) ( 21,264)

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	12 Months Ended
	Dec. 31, 2019
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Reserve For Losses LAE And Future Policy Benefit Reserve	3. RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE Reserves for losses and LAE. Activity in the reserve for losses and LAE is summarized for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross reserves beginning of period $ 13,119,090 $ 11,884,321 10,312,313 Less reinsurance recoverables ( 1,619,641) ( 1,212,649) ( 990,862) Net reserves beginning of period 11,499,449 10,671,672 9,321,451 Incurred related to: Current year 4,986,456 5,264,327 4,815,967 Prior years ( 63,558) 387,076 ( 293,386) Total incurred losses and LAE 4,922,898 5,651,403 4,522,581 Paid related to: Current year 2,042,246 1,700,765 1,280,605 Prior years 2,460,825 3,011,175 2,062,634 Total paid losses and LAE 4,503,071 4,711,940 3,343,239 Foreign exchange/translation adjustment 51,325 ( 111,686) 170,879 Net reserves end of period 11,970,601 11,499,449 10,671,672 Plus reinsurance recoverables 1,640,712 1,619,641 1,212,649 Gross reserves end of period $ 13,611,313 $ 13,119,090 11,884,321 (Some amounts may not reconcile due to rounding.) Current year incurred losses were $ 4,986,456 thousand, $ 5,264,327 thousand and $ 4,815,967 thousand at December 31, 2019, 2018 and 2017, respectively. The decrease in current year incurred losses from 2018 to 2019 was primarily due to $ 693,458 thousand of lower catastrophe losses in 2019 compared to 2018, partially offset by $ 415,585 thousand of additional attritional losses related to higher premiums earned in 2019 compared to 2018. Incurred prior years losses decreased by $ 63,558 thousand in 2019, increased by $ 387,076 thousand in 2018 and decreased by $293,386 thousand in 2017. The decrease for 2019 primarily related to reserve reductions associated short-tail lines of business and worker’s compensation. The increase for 2018 was mainly due to $ 561,197 thousand of adverse development on prior years catastrophe losses, primarily related to Hurricanes Harvey, Irma and Maria, as well as the 2017 California wildfires. The increase in loss estimates for Hurricanes Harvey, Irma and Maria was mostly driven by re-opened claims, loss inflation from higher than expected loss adjustment expenses and in particular, their impact on aggregate covers. This reserve increase was partially offset by $ 174,121 thousand of favorable development on prior years attritional losses which mainly related to U.S. and international property and casualty reinsurance business, as well as favorable development in the Insurance segment which largely related to workers’ compensation business. The decrease for 2017 was attributable to favorable development in the reinsurance segments of $ 238,378 thousand, related primarily to property and short-tail business in the U.S. and Bermuda as well as favorable development on prior year catastrophe losses, partially offset by $ 37,137 thousand of adverse development on A&E reserves. The insurance segment also experienced favorable development on prior year reserves of $ 55,007 thousand mainly on its workers compensation business, which is largely written in California. The following is information about incurred and paid claims development as of December 31, 2019, net of reinsurance, as well as cumulative claim frequency and the total of incurred but not reported liabilities (IBNR) plus expected development on reported claims included within the net incurred claims amounts. Each of the Company’s financial reporting segments has been disaggregated into casualty and property business. The casualty and property segregation results in groups that have homogeneous loss development characteristics and are large enough to represent credible trends. Generally, casualty claims take longer to be reported and settled, resulting in longer payout patterns and increased volatility. Property claims on the other hand, tend to be reported and settled quicker and therefore tend to exhibit less volatility. The property business is more exposed to catastrophe losses, which can result in year over year fluctuations in incurred claims depending on the frequency and severity of catastrophes claims in any one accident year. The information about incurred and paid claims development for the years ended December 31, 2012 to December 31, 2018 is presented as supplementary information. These tables present eight years of incurred and paid claims development as it is impracticable to retrospectively create the tables for ten years. For the reinsurance groups, for the years prior to 2012, the total of IBNR plus expected development on reported claims was not prepared on an accident year basis. The Company calculated these IBNR amounts in the aggregate for each business unit in total as of prior year end points in time. While business written in the United States would have been allocated to accident year for regulatory reporting purposes, business written outside of the United States would not have been similarly allocated. Attempting to allocate the non-U.S. business IBNR reserves to accident year currently for older year end valuations would require making assumptions and estimates which may not be in line with assumptions that would have been made at the time. A similar situation applies to insurance where the accumulation of the business lines reported in the regulatory filings are not consistent with the breakout of the tables presented below. As a result of not being able to present the information prior to 2012, prospectively an additional year will be added to the tables each reporting year until a ten year table is presented. The Cumulative Number of Reported Claims is shown only for Insurance Casualty as it is impracticable to provide the information for the remaining groups. The reinsurance groups each include pro rata contracts for which ceding companies provide only summary information via a bordereau. This summary information does not include the number of reported claims underlying the paid and reported losses. Therefore, it is not possible to provide this information. The Insurance Property group includes Accident & Health insurance business. This business is written via a master contract and individual claim counts are not provided. This business represents a significant enough portion of the business in the Insurance Property group so that including the number of reported claims for the remaining business would distort any analytics performed on the group. The Cumulative Number of Reported Claims shown for the Insurance Casualty is determined by claim and line of business. For example, a claim event with three claimants in the same line of business is a single claim. However, a claim event with a single claimant that spans two lines of business contributes two claims. The following tables present the ultimate loss and ALAE and the paid loss and ALAE, net of reinsurance for casualty and property, as well as the average annual percentage payout of incurred claims by age, net of reinsurance for each of our disclosed lines of business. U.S. Reinsurance – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 401,018 $ 395,794 $ 329,084 $ 325,134 $ 321,099 $ 320,958 $ 324,139 $ 312,483 1,539 N/A 2013 310,935 388,323 385,643 388,287 372,409 362,781 355,118 3,851 N/A 2014 367,492 383,657 392,379 375,404 357,608 351,033 2,232 N/A 2015 326,346 354,265 352,983 350,790 337,332 10,184 N/A 2016 330,362 354,822 355,804 343,004 56,353 N/A 2017 346,836 347,147 342,896 105,550 N/A 2018 484,218 472,532 259,800 N/A 2019 767,529 488,182 N/A $ 3,281,926 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 9,986 $ 38,496 $ 82,995 $ 143,510 $ 187,286 $ 218,653 $ 272,046 $ 286,409 2013 14,842 48,929 108,801 170,868 211,273 285,756 310,168 2014 18,809 54,255 110,249 164,552 254,077 294,533 2015 19,902 53,621 107,458 206,397 257,511 2016 18,927 58,310 137,219 193,804 2017 25,800 73,023 142,335 2018 63,140 104,690 2019 103,453 $ 1,692,901 All outstanding liabilities prior to 2012, net of reinsurance 607,385 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,196,410 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 8.4 % 10.3 % 17.7 % 19.6 % 16.6 % 14.4 % 11.7 % 4.6 % U.S. Reinsurance – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 937,720 $ 723,851 $ 723,151 $ 715,961 $ 713,237 $ 706,782 $ 692,079 $ 694,576 1,112 N/A 2013 622,108 405,338 352,687 314,637 310,942 308,557 310,199 1,099 N/A 2014 603,258 516,189 437,409 402,129 396,641 397,683 2,674 N/A 2015 673,913 534,178 476,348 451,694 456,195 5,655 N/A 2016 972,881 816,765 797,339 788,551 10,293 N/A 2017 1,564,165 2,117,747 2,231,384 16,538 N/A 2018 1,728,705 1,572,138 88,063 N/A 2019 970,831 329,576 N/A $ 7,421,556 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 242,315 $ 402,305 $ 520,244 $ 598,289 $ 621,013 $ 646,572 $ 651,550 $ 666,768 2013 234,464 250,850 269,014 289,130 296,074 300,708 302,756 2014 189,598 289,430 338,030 362,825 373,060 375,988 2015 225,655 320,310 378,235 405,614 419,757 2016 291,462 582,985 681,502 735,678 2017 545,551 1,422,328 1,744,822 2018 409,225 1,064,431 2019 568,556 $ 5,878,758 All outstanding liabilities prior to 2012, net of reinsurance 29,929 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,572,727 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 36.5 % 34.0 % 13.6 % 7.7 % 2.9 % 2.4 % 0.7 % 2.2 % International – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 224,614 $ 146,421 $ 135,234 $ 135,230 $ 117,350 $ 118,941 $ 116,283 101,872 6,225 N/A 2013 184,497 168,277 164,973 144,869 141,645 138,355 130,124 13,641 N/A 2014 195,753 187,451 168,865 166,576 166,605 158,117 27,302 N/A 2015 193,714 179,392 172,811 172,061 167,290 30,299 N/A 2016 184,267 180,284 177,979 178,255 46,648 N/A 2017 191,492 139,214 150,276 48,308 N/A 2018 309,673 319,752 148,582 N/A 2019 291,237 189,506 N/A $ 1,496,922 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 18,875 $ 30,090 $ 46,015 $ 56,420 $ 66,234 $ 76,921 $ 83,253 $ 88,278 2013 17,865 41,481 54,619 67,605 75,964 86,851 95,799 2014 25,910 44,805 62,508 73,955 86,607 99,522 2015 24,237 48,806 69,674 82,465 96,180 2016 26,446 50,824 70,108 87,191 2017 26,541 52,774 77,614 2018 57,962 97,222 2019 52,808 $ 694,615 All outstanding liabilities prior to 2012, net of reinsurance 116,104 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 918,411 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 16.7 % 13.9 % 12.6 % 8.8 % 8.0 % 8.8 % 6.6 % 4.9 % International – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 437,946 $ 397,747 $ 338,496 $ 346,116 $ 342,251 $ 340,618 $ 344,626 $ 358,428 754 N/A 2013 473,767 413,959 374,216 366,182 365,106 362,370 369,876 920 N/A 2014 589,489 541,484 497,317 443,210 445,914 446,412 3,613 N/A 2015 545,360 393,027 388,795 384,816 385,980 4,466 N/A 2016 539,447 543,428 593,567 595,512 15,930 N/A 2017 857,100 954,835 970,874 15,997 N/A 2018 544,258 574,521 84,717 N/A 2019 879,698 389,242 N/A $ 4,581,301 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 126,001 $ 230,203 $ 279,611 $ 303,002 $ 311,706 $ 319,112 $ 324,936 $ 355,887 2013 121,461 246,893 294,024 325,155 337,087 341,831 354,102 2014 162,647 295,731 360,679 392,731 410,715 416,735 2015 127,511 235,921 299,773 334,271 345,693 2016 159,425 316,190 447,094 481,029 2017 247,895 641,832 773,790 2018 90,429 330,681 2019 151,893 $ 3,209,811 All outstanding liabilities prior to 2012, net of reinsurance 54,040 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,425,530 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 25.9 % 34.1 % 15.6 % 7.2 % 3.2 % 1.5 % 2.5 % 8.6 % Bermuda – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 284,509 $ 262,122 $ 240,949 $ 230,441 $ 236,883 $ 237,315 $ 241,312 $ 241,631 30,273 N/A 2013 228,258 258,432 252,704 261,259 250,627 234,668 230,654 33,689 N/A 2014 211,439 244,163 261,523 257,904 234,196 226,434 48,168 N/A 2015 273,468 301,791 307,957 308,042 309,983 82,925 N/A 2016 292,353 351,182 349,522 357,169 114,651 N/A 2017 354,391 365,767 365,823 181,139 N/A 2018 547,267 546,367 376,744 N/A 2019 667,150 551,529 N/A $ 2,945,212 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 12,864 $ 29,660 $ 51,278 $ 75,680 $ 102,019 $ 130,159 $ 149,629 $ 164,775 2013 16,996 33,951 52,270 77,270 102,866 124,708 144,010 2014 13,580 24,915 42,872 67,716 91,981 115,098 2015 13,643 58,956 93,220 127,930 153,080 2016 45,671 84,152 121,553 155,397 2017 29,904 64,197 103,915 2018 36,678 93,727 2019 61,239 $ 991,242 All outstanding liabilities prior to 2012, net of reinsurance 356,351 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,310,321 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 7.8 % 9.7 % 9.8 % 10.5 % 10.0 % 10.5 % 8.2 % 6.3 % Bermuda – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 238,152 $ 180,775 $ 119,168 $ 117,221 $ 117,909 $ 118,999 $ 117,734 $ 120,824 593 N/A 2013 217,531 142,666 124,191 115,029 114,252 114,800 112,900 272 N/A 2014 186,492 164,139 138,381 134,776 137,389 136,813 1,092 N/A 2015 192,520 157,711 143,625 146,196 143,266 2,204 N/A 2016 206,279 181,593 186,735 187,607 4,619 N/A 2017 393,969 365,405 346,472 10,115 N/A 2018 394,542 396,488 85,786 N/A 2019 343,602 184,640 N/A $ 1,787,971 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 45,573 $ 85,175 $ 90,147 $ 108,172 $ 111,772 $ 113,508 $ 113,816 $ 116,429 2013 34,745 64,560 101,614 108,535 110,378 111,655 111,833 2014 32,813 86,611 106,564 126,552 129,891 131,455 2015 33,814 73,041 109,401 131,387 134,862 2016 26,737 78,499 130,319 167,562 2017 38,106 137,127 250,661 2018 72,580 170,831 2019 66,370 $ 1,150,003 All outstanding liabilities prior to 2012, net of reinsurance 26,236 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 664,204 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 19.6 % 28.5 % 25.2 % 14.9 % 2.4 % 1.2 % 0.2 % 2.2 % Insurance – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 349,597 $ 351,402 $ 346,953 $ 348,180 $ 353,320 $ 343,931 $ 346,882 $ 351,320 20,199 15,769 2013 393,539 393,390 392,827 393,035 351,295 344,388 350,815 23,120 21,350 2014 431,068 457,043 454,576 460,642 397,061 397,834 38,872 25,188 2015 519,509 528,050 535,671 542,176 468,584 54,740 26,896 2016 553,437 551,321 580,323 615,168 166,117 31,517 2017 612,967 602,985 625,039 226,898 34,701 2018 705,789 711,001 353,806 33,817 2019 850,832 653,255 30,144 $ 4,370,593 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 33,185 $ 101,288 $ 157,897 $ 213,451 $ 246,407 $ 272,055 $ 294,380 $ 306,833 2013 33,311 117,037 176,312 224,611 260,184 285,822 303,726 2014 41,190 124,915 201,646 256,807 297,644 325,856 2015 44,311 134,730 218,853 291,943 353,232 2016 54,731 164,225 268,909 342,325 2017 53,898 172,200 280,797 2018 63,492 208,081 2019 72,375 $ 2,193,224 All outstanding liabilities prior to 2012, net of reinsurance 300,347 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,477,716 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 9.1 % 19.8 % 17.4 % 14.0 % 10.9 % 7.2 % 6.7 % 3.3 % Insurance – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 106,325 $ 89,000 $ 81,747 $ 82,448 $ 82,019 $ 81,802 $ 81,979 $ 82,526 68 N/A 2013 112,037 98,106 91,251 92,144 92,233 92,393 92,246 471 N/A 2014 131,679 123,668 119,928 119,464 119,282 119,413 407 N/A 2015 172,904 152,895 143,944 146,780 144,769 405 N/A 2016 290,264 275,154 280,170 291,672 736 N/A 2017 496,905 501,407 494,844 13,043 N/A 2018 407,855 401,900 14,862 N/A 2019 348,590 81,655 N/A $ 1,975,961 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 56,504 $ 81,772 $ 80,469 $ 81,749 $ 81,891 $ 81,682 $ 81,820 $ 82,457 2013 68,695 93,110 91,841 92,110 91,720 91,759 91,777 2014 81,827 116,037 118,220 118,211 118,545 118,660 2015 102,170 141,280 142,437 145,225 146,719 2016 162,548 249,517 271,938 289,194 2017 178,666 424,181 458,811 2018 244,772 358,324 2019 227,387 $ 1,773,329 All outstanding liabilities prior to 2012, net of reinsurance 644 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 203,277 (Some amounts may not reconcile due to rounding.) Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 56.8 % 35.0 % 4.7 % 3.0 % 0.4 % - % 0.1 % - % Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Liability for Unpaid Claims and Claim Adjustment Expenses The reconciliation of the net incurred and paid claims development tables to the liability for claims and claim adjustment expenses in the consolidated statement of financial position is as follows. December 31, 2019 (Dollars in thousands) Net outstanding liabilities U.S. Reinsurance Casualty $ 2,196,410 U.S. Reinsurance Property 1,572,727 International Casualty 918,411 International Property 1,425,530 Bermuda Casualty 2,310,321 Bermuda Property 664,204 Insurance Casualty 2,477,716 Insurance Property 203,277 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 11,768,596 Reinsurance recoverable on unpaid claims U.S. Reinsurance Casualty 363,925 U.S. Reinsurance Property 207,967 International Casualty 91,193 International Property 149,803 Bermuda Casualty 9,975 Bermuda Property 68,639 Insurance Casualty 631,827 Insurance Property 117,382 Total reinsurance recoverable on unpaid claims 1,640,712 Insurance lines other than short-duration - Unallocated claims adjustment expenses 163,563 Other 38,442 202,005 Total gross liability for unpaid claims and claim adjustment expense $ 13,611,313 (Some amounts may not reconcile due to rounding.) Reserving Methodology The Company maintains reserves equal to our estimated ultimate liability for losses and loss adjustment expense (LAE) for reported and unreported claims for our insurance and reinsurance businesses. Because reserves are based on estimates of ultimate losses and LAE by underwriting or accident year, the Company uses a variety of statistical and actuarial techniques to monitor reserve adequacy over time, evaluate new information as it becomes known, and adjust reserves whenever an adjustment appears warranted. The Company considers many factors when setting reserves including: (1) exposure base and projected ultimate premium; (2) expected loss ratios by product and class of business, which are developed collaboratively by underwriters and actuaries; (3) actuarial methodologies and assumptions which analyze loss reporting and payment experience, reports from ceding companies and historical trends, such as reserving patterns, loss payments, and product mix; (4) current legal interpretations of coverage and liability; and (5) economic conditions. Insurance and reinsurance loss and LAE reserves represent the Company’s best estimate of its ultimate liability. Actual loss and LAE ultimately paid may deviate, perhaps substantially, from such reserves. Net income (gain or loss) will be impacted in a period in which the change in estimated ultimate loss and LAE is recorded. The detailed data required to evaluate ultimate losses for the Company’s insurance business is accumulated from its underwriting and claim systems. Reserving for reinsurance requires evaluation of loss information received from ceding companies. Ceding companies report losses in many forms depending on the type of contract and the agreed or contractual reporting requirements. Generally, pro rata contracts require the submission of a monthly/quarterly account, which includes premium and loss activity for the period with corresponding reserves as established by the ceding company. This information is recorded into the Company’s records. For certain pro rata contracts, the Company may require a detailed loss report for claims that exceed a certain dollar threshold or relate to a particular type of loss. Excess of loss and facultative contracts generally require individual loss reporting with precautionary notices provided when a loss reaches a significant percentage of the attachment point of the contract or when certain causes of loss or types of injury occur. Experienced claims staff handles individual loss reports and supporting claim information. Based on evaluation of a claim, the Company may establish additional case reserves in addition to the case reserves reported by the ceding company. To ensure ceding companies are submitting required and accurate data, Everest’s Underwriting, Claim, Reinsurance Accounting, and Internal Audit Departments perform various reviews of ceding companies, particularly larger ceding companies, including on-site audits. The Company segments both reinsurance and insurance reserves into exposure groupings for actuarial analysis. The Company assigns business to exposure groupings so that the underlying exposures have reasonably homogeneous loss development characteristics and are large enough to facilitate credible estimation of ultimate losses. The Company periodically reviews its exposure groupings and may change groupings over time as business changes. The Company currently uses approximately 200 exposure groupings to develop reserve estimates. One of the key selection characteristics for the exposure groupings is the historical duration of the claims settlement process. Business in which claims are reported and settled relatively quickly are commonly referred to as short tail lines, principally property lines. On the other hand, casualty claims tend to take longer to be reported and settled and casualty lines are generally referred to as long tail lines. Estimates of ultimate losses for shorter tail lines, with the exception of loss estimates for large catastrophic events, generally exhibit less volatility than those for the longer tail lines. The Company uses a variety of actuarial methodologies, such as the expected loss ratio method, chain ladder methods, and Bornhuetter-Ferguson methods, supplemented by judgment where appropriate, to estimate ultimate loss and LAE for each exposure group. Expected Loss Ratio Method: The expected loss ratio method uses earned premium times an expected loss ratio to calculate ultimate losses for a given underwriting or accident year. This method relies entirely on expectation to project ultimate losses with no consideration given to actual losses. As such, it may be appropriate for an immature underwriting or accident year where few, if any, losses have been reported or paid, but less appropriate for a more mature year. Chain Ladder Method: Chain ladder methods use a standard loss development triangle to project ultimate losses. Age-to-age development factors are selected for each development period and combined to calculate age-to-ultimate development factors which are then applied to paid or reported losses to project ultimate losses. This method relies entirely on actual paid or reported losses to project ultimate losses. No other factors such as changes in pricing or other expectations are taken into account. It is most appropriate for groups with homogeneous, stable experience where past development patterns are expected to continue in the future. It is least appropriate for groups which have changed significantly over time or which are more volatile. Bornhuetter-Ferguson Method: The Bornhuetter-Ferguson method is a combination of the expected loss ratio method and the chain ladder method. Ultimate losses are projected based partly on actual paid or reported losses and partly on expectation. Incurred but not reported (IBNR) reserves are calculated using earned premium, an a priori loss ratio, and selected age-to-age development factors and added to actual reported (paid) losses to determine ultimate losses. It is more responsive to actual reported or paid development than the expected loss ratio method but less responsive than the chain ladder method. The reliability of the method depends on the accuracy of the selected a priori loss ratio. Although the Company uses similar actuarial methods for both short tail and long tail lines, the faster reporting of experience for the short tail lines allows the Company to have greater confidence in its estimates of ultimate losses for short tail lines at an earlier stage than for long tail lines. As a result, the Company utilizes, as well, exposure-based methods to estimate its ultimate losses for longer tail lines, especially for immature underwriting or accident years. For both short and long tail lines, the Company supplements these general approaches with analytically based judgments. Key actuarial assumptions contain no explicit provisions for reserve uncertainty nor does the Company supplement the actuarially determined reserves for uncertainty. Carried reserves at each reporting date are the Company’s best estimate of ultimate unpaid losses and LAE at that date. The Company completes detailed reserve studies for each exposure group annually for both reinsurance and insurance operations. The completed annual reserve studies are “rolled-forward” for each accounting period until the subsequent reserve study is completed. Analyzing the roll-forward process involves comparing actual reported losses to expected losses based on the most recent reserve study. The Company analyzes significant variances between actual and expected losses and post adjustments to its reserves as warranted. The Company continues to receive claims under expired insurance and reinsurance contracts asserting injuries and/or damages relating to or resulting from environmental pollution and hazardous substances, including asbestos. Environmental claims typically assert liability for (a) the mitigation or remediation of environmental contamination or (b) bodily injury or property damage caused by the release of hazardous substances into the land, air or water. Asbestos claims typically assert liability for bodily injury from exposure to asbestos or for property damage resulting from asbestos or products containing asbestos. The Company’s reserves include an estimate of the Company’s ultimate liability for A&E claims. The Company’s A&E liabilities emanate from Mt. McKinley’s direct insurance business and Everest Re’s assumed reinsurance business. All of the contracts of insurance and reinsurance, under which the Company has received claims during the past three years, expired more than 20 years ago. There are significant uncertainties surrounding the Company’s reserves for its A&E losses. A&E exposures represent a separate exposure group for monitoring and evaluating reserve adequacy. The following table summarizes incurred losses with respect to A&E reserves on both a gross and net of reinsurance basis for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 2017 Gross basis: Beginning of period reserves $ 347,495 $ 448,994 $ 441,111 Incurred losses

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2019
Fair Value [Abstract]
Fair Value	4. FAIR VALUE GAAP guidance regarding fair value measurements address how companies should measure fair value when they are required to use fair value measures for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based on the transparency of inputs to the valuation of an asset or liability. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement, with Level 1 being the highest priority and Level 3 being the lowest priority. The levels in the hierarchy are defined as follows: Level 1: Inputs to the valuation methodology are observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in an active market; Level 2: Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument; Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The Company’s fixed maturity and equity securities are primarily managed by third party investment asset managers. The investment asset managers obtain prices from nationally recognized pricing services. These services seek to utilize market data and observations in their evaluation process. They use pricing applications that vary by asset class and incorporate available market information and when fixed maturity securities do not trade on a daily basis the services will apply available information through processes such as benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. In addition, they use model processes, such as the Option Adjusted Spread model to develop prepayment and interest rate scenarios for securities that have prepayment features. In limited instances where prices are not provided by pricing services or in rare instances when a manager may not agree with the pricing service, price quotes on a non-binding basis are obtained from investment brokers. The investment asset managers do not make any changes to prices received from either the pricing services or the investment brokers. In addition, the investment asset managers have procedures in place to review the reasonableness of the prices from the service providers and may request verification of the prices. In addition, the Company continually performs analytical reviews of price changes and tests the prices on a random basis to an independent pricing source. No material variances were noted during these price validation procedures. In limited situations, where financial markets are inactive or illiquid, the Company may use its own assumptions about future cash flows and risk-adjusted discount rates to determine fair value. At December 31, 2019, $ 772,979 thousand of fixed maturities, market value and $ 5,826 thousand of fixed maturities, fair value were fair valued using unobservable inputs. The majority of the fixed maturities, market value, $ 610,873 thousand, were valued by investment managers’ valuation committees and a majority of these fair values and all of the $ 5,826 thousand of fixed maturities, fair value were substantiated by valuations from independent third parties. The Company has procedures in place to review and evaluate these independent third party valuations. The remaining Level 3 fixed maturities of $ 162,106 thousand were valued at either par or amortized cost, which the Company believes approximates fair value. At December 31, 2018, $ 435,959 thousand of fixed maturities, market value and $ 2,337 thousand of fixed maturities, fair value were fair valued using unobservable inputs. The majority of the fixed maturities, market value, $ 354,143 thousand and all of the $ 2,337 thousand of fixed maturities, fair value were valued by investment managers’ valuation committees and a majority of these fair values were substantiated by valuations from independent third parties. The remaining Level 3 fixed maturities of $ 80,663 thousand were fair valued by the Company at either par or amortized cost and $ 1,153 thousand were priced using a non-binding broker quote. The Company internally manages a public equity portfolio which had a fair value at December 31, 2019 and December 31, 2018 of $ 170,888 thousand and $ 124,228 thousand, respectively, and all prices were obtained from publicly published sources. Equity securities denominated in U.S. currency with quoted prices in active markets for identical assets are categorized as level 1 since the quoted prices are directly observable. Equity securities traded on foreign exchanges are categorized as level 2 due to the added input of a foreign exchange conversion rate to determine fair or market value. The Company uses foreign currency exchange rates published by nationally recognized sources. All categories of fixed maturity securities listed in the tables below are generally categorized as level 2, since a particular security may not have traded but the pricing services are able to use valuation models with observable market inputs such as interest rate yield curves and prices for similar fixed maturity securities in terms of issuer, maturity and seniority. For foreign government securities and foreign corporate securities, the fair values provided by the third party pricing services in local currencies, and where applicable, are converted to U.S. dollars using currency exchange rates from nationally recognized sources. The fixed maturities with fair values categorized as level 3 result when prices are not available from the nationally recognized pricing services. The asset managers will then obtain non-binding price quotes for the securities from brokers. The single broker quotes are provided by market makers or broker-dealers who are recognized as market participants in the markets in which they are providing the quotes. The prices received from brokers are reviewed for reasonableness by the third party asset managers and the Company. If the broker quotes are for foreign denominated securities, the quotes are converted to U.S. dollars using currency exchange rates from nationally recognized sources. In limited circumstances when broker prices are not available for private placements, the Company will value the securities using comparable market information or receive fair values from investment managers. The composition and valuation inputs for the presented fixed maturities categories are as follows: • U.S. Treasury securities and obligations of U.S. government agencies and corporations are primarily comprised of U.S. Treasury bonds and the fair value is based on observable market inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields; • Obligations of U.S. states and political subdivisions are comprised of state and municipal bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; • Corporate securities are primarily comprised of U.S. corporate and public utility bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; • Asset-backed and mortgage-backed securities fair values are based on observable inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields and cash flow models using observable inputs such as prepayment speeds, collateral performance and default spreads; • Foreign government securities are comprised of global non-U.S. sovereign bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source; • Foreign corporate securities are comprised of global non-U.S. corporate bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source. The Company sold seven equity index put option contracts, based on two indices, in 2001 and 2005. The Company sold these equity index put options as insurance products with the intent of achieving a profit. These equity index put option contracts meet the definition of a derivative under FASB guidance and the Company’s position in these equity index put option contracts is unhedged. Accordingly, these equity index put option contracts are carried at fair value in the consolidated balance sheets with changes in fair value recorded in the consolidated statements of operations and comprehensive income (loss). Four of these contracts had expired prior to December 31, 2019 with no liabilities due under the terms of the expired contracts. The Company had two remaining equity index put option contracts at December 31, 2019, based on the Standard & Poor’s 500 (“S&P 500”) index. Based on historical index volatilities and trends and the December 31, 2019 S&P 500 index value, the Company estimates the probability that each equity index put option contract of the S&P 500 index falling below the strike price on the exercise date to be less than 0.4%. The theoretical maximum payouts under these equity index put option contracts would occur if on each of the exercise dates the S&P 500 index value were zero. At December 31, 2019, the present value of the theoretical maximum payouts using a 3% discount factor was $ 208,359 thousand. Conversely, if the contracts had all expired on December 31, 2019, with the S&P index at 3,230.78, there would have been no settlement amount. The Company has one equity index put option contract based on the FTSE 100 index. Based on historical index volatilities and trends and the December 31, 2019 FTSE 100 index value, the Company estimates the probability that the equity index put option contract of the FTSE 100 index will fall below the strike price on the exercise date to be less than 4%. The theoretical maximum payout under the equity index put option contract would occur if on the exercise date the FTSE 100 index value was zero. At December 31, 2019, the present value of the theoretical maximum payout using a 3% discount factor and current exchange rate was $ 42,899 thousand. Conversely, if the contract had expired on December 31, 2019, with the FTSE index at 7,542.44, there would have been no settlement amount. At December 31, 2019 and December 31, 2018, the fair value for these equity put options was $ 5,584 thousand and $ 11,958 thousand, respectively. The Company’s liability for equity index put options is categorized as level 3 since there is no active market for these equity put options. The fair values for these options are calculated by the Company using an industry accepted pricing model, Black-Scholes. The model inputs and assumptions are: risk free interest rates, equity market indexes values, volatilities and dividend yields and duration. The model results are then adjusted for the Company’s credit default swap rate. All of these inputs and assumptions are updated quarterly. One of the option contacts is in British Pound Sterling so the fair value for this contract is converted to U.S. dollars using an exchange rate from a nationally recognized source. The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value (fair and market value) as of the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,515,803 $ - $ 1,515,803 $ - Obligations of U.S. States and political subdivisions 536,915 - 536,915 - Corporate securities 6,374,946 - 5,757,358 617,588 Asset-backed securities 897,333 - 743,692 153,641 Mortgage-backed securities Commercial 844,557 - 844,557 - Agency residential 2,198,581 - 2,198,581 - Non-agency residential 5,703 - 5,703 - Foreign government securities 1,505,950 - 1,505,950 - Foreign corporate securities 2,945,156 - 2,943,406 1,750 Total fixed maturities, market value 16,824,944 - 16,051,965 772,979 Fixed maturities, fair value 5,826 - - 5,826 Equity securities, fair value 931,457 864,584 66,873 - Liabilities: Equity index put option contracts $ 5,584 $ - $ - $ 5,584 There were no transfers between Level 1 and Level 2 for the twelve months ended December 31, 2019. The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value (fair and market value) as of the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,631,134 $ - $ 2,631,134 $ - Obligations of U.S. States and political subdivisions 500,094 - 500,094 - Corporate securities 5,445,532 - 5,017,317 428,215 Asset-backed securities 540,097 - 540,097 - Mortgage-backed securities Commercial 326,710 - 326,710 - Agency residential 1,796,264 - 1,796,264 - Non-agency residential 10,209 - 10,209 - Foreign government securities 1,314,165 - 1,314,165 - Foreign corporate securities 2,661,058 - 2,653,314 7,744 Total fixed maturities, market value 15,225,263 - 14,789,304 435,959 Fixed maturities, fair value 2,337 - - 2,337 Equity securities, fair value 716,639 674,433 42,206 - Liabilities: Equity index put option contracts $ 11,958 $ - $ - $ 11,958 In addition, $ 209,578 thousand and $ 117,662 thousand of investments within other invested assets on the consolidated balance sheets as of December 31, 2019 and 2018, respectively, are not included within the fair value hierarchy tables as the assets are measured at NAV as a practical expedient to determine fair value. The following tables present the activity under Level 3, fair value measurements using significant unobservable inputs by asset type, for the periods indicated: Total Fixed Maturities, Market Value December 31, 2019 December 31, 2018 Corporate Asset-Backed Foreign Corporate Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 428,215 $ - $ 7,744 $ 435,959 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 4,937 - ( 12) 4,925 ( 92) ( 660) ( 752) Included in other comprehensive income (loss) ( 20) 3,632 ( 110) 3,502 1,091 - 1,091 Purchases, issuances and settlements 179,761 150,009 ( 5,872) 323,898 215,838 ( 298) 215,540 Transfers in and/or (out) of Level 3 4,695 - - 4,695 1,192 1,750 2,942 Ending balance $ 617,588 $ 153,641 $ 1,750 $ 772,979 $ 428,215 $ 7,744 $ 435,959 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value December 31, 2019 December 31, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 2,337 $ 2,337 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings 2,163 2,163 ( 293) ( 293) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements 1,326 1,326 2,630 2,630 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 5,826 $ 5,826 $ 2,337 $ 2,337 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ 1,795 $ 1,795 $ - $ - (Some amounts may not reconcile due to rounding.) The net transfers to/(from) level 3, fair value measurements using significant unobservable inputs for fixed maturities, market value were $ 4,695 thousand and $ 2,942 thousand as of December 31, 2019 and 2018, respectively. The transfers during 2019 and 2018 were related to securities that were priced using a recognized pricing service as of December 31, 2018 and 2017, respectively. These securities were subsequently priced by investment managers as of December 31, 2019 and 2018, respectively. The following table presents the activity under Level 3, fair value measurements using significant unobservable inputs for equity index put option contracts, for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 Liabilities: Balance, beginning of period $ 11,958 $ 12,477 Total (gains) or losses (realized/unrealized) Included in earnings ( 6,374) ( 520) Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 5,584 $ 11,958 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ - $ - (Some amounts may not reconcile due to rounding.)

Credit Facilities

Credit Facilities	12 Months Ended
	Dec. 31, 2019
Credit Facilities [Abstract]
Credit Facilities	5. CREDIT FACILITIES The Company has two active credit facilities for a total commitment of up to $ 1,000,000 thousand and an additional credit facility for a total commitment of up to £, 47000 thousand, providing for the issuance of letters of credit and/or unsecured revolving credit lines. The following table presents the interest and fees incurred in connection with the two credit facilities for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Credit facility interest and fees incurred $ 420 $ 420 $ 420 The terms and outstanding amounts for each facility are discussed below: Group Credit Facility Effective May 26, 2016, Group, Everest Reinsurance (Bermuda), Ltd. (“Bermuda Re”) and Everest International Reinsurance, Ltd. (“Everest International”), both direct subsidiaries of Group, entered into a five year, $ 800,000 thousand senior credit facility with a syndicate of lenders, which amended and restated in its entirety the June 22, 2012, four year, $ 800,000 thousand senior credit facility. Both the May 26, 2016 and June 22, 2012 senior credit facilities, which have similar terms, are referred to as the “Group Credit Facility”. Wells Fargo Corporation (“Wells Fargo Bank”) is the administrative agent for the Group Credit Facility, which consists of two tranches. Tranche one provides up to $ 200,000 thousand of unsecured revolving credit for liquidity and general corporate purposes, and for the issuance of unsecured standby letters of credit. The interest on the revolving loans shall, at the Company’s option, be either (1) the Base Rate (as defined below) or (2) an adjusted London Interbank Offered Rate (“LIBOR”) plus a margin. The Base Rate is the higher of (a) the prime commercial lending rate established by Wells Fargo Bank, (b) the Federal Funds Rate plus 0.5% per annum or (c) the one month LIBOR Rate plus 1.0% per annum. The amount of margin and the fees payable for the Group Credit Facility depends on Group’s senior unsecured debt rating. Tranche two exclusively provides up to $ 600,000 thousand for the issuance of standby letters of credit on a collateralized basis. The Group Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 to 1 and to maintain a minimum net worth. Minimum net worth is an amount equal to the sum of $ 5,370,979 thousand plus 25% of consolidated net income for each of Group’s fiscal quarters, for which statements are available ending on or after March 31, 2016 and for which consolidated net income is positive, plus 25% of any increase in consolidated net worth during such period attributable to the issuance of ordinary and preferred shares, which at December 31, 2019, was $ 6,256,094 thousand. As of December 31, 2019, the Company was in compliance with all Group Credit Facility covenants. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ 33,737 12/31/2020 $ 200,000 $ - Tranche Two 2,381 7/29/2020 Tranche Two 1,649 9/30/2020 Tranche Two 573,353 12/31/2020 Tranche Two 600,000 12,364 1/4/2021 600,000 558,818 12/31/2019 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 623,484 $ 800,000 $ 558,818 Bermuda Re Letter of Credit Facility Effective December 31, 2019, Bermuda Re renewed its letter of credit issuance facility with Citibank N.A. referred to as the “Bermuda Re Letter of Credit Facility”, which commitment is reconfirmed annually with updated fees. The current renewal of the Bermuda Re Letter of Credit Facility provides for the issuance of up to $ 200,000 thousand of secured letters of credit to collateralize reinsurance obligations as a non-admitted reinsurer. The interest on drawn letters of credit shall be (A) 0.35% per annum of the principal amount of issued standard letters of credit (expiry of 15 months or less) and (B) 0.45% per annum of the principal amount of issued extended tenor letters of credit (expiry maximum of up to 60 months). The commitment fee on undrawn credit shall be 0.15% per annum. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 4,425 02/29/2020 $ 200,000 $ 3,482 02/28/2019 512 09/03/2020 3,672 11/24/2019 3,672 11/24/2020 72,443 12/31/2019 177 12/16/2020 296 08/15/2020 125 12/20/2020 177 12/16/2020 101,404 12/31/2020 125 12/20/2020 559 08/15/2021 1,851 11/04/2022 37,096 12/30/2023 407 11/13/2022 - 59,293 12/30/2022 Total Citibank Bilateral Agreement $ 200,000 $ 147,970 $ 200,000 $ 141,746 Everest International Credit Facility Effective November 7, 2019, Everest International renewed its credit facility with Lloyds Bank plc (“Everest International Credit Facility”). The current renewal of the Everest International Credit Facility has a four year term and provides up to £ 47,000 thousand for the issuance of standby letters of credit on a collateralized basis. The Company pays a commitment fee of 0.1% per annum on the average daily amount of the remainder of (1) the aggregate amount available under the facility and (2) the aggregate amount of drawings outstanding under the facility. The Company pays a credit commission fee of 0.35% per annum on drawings outstanding under the facility. The Everest International Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 to 1 and to maintain a minimum net worth. Minimum net worth is an amount equal to the sum of $ 5,326,009 thousand ( 70% of consolidated net worth as of December 31, 2015), plus 25% of consolidated net income for each of Group’s fiscal quarters, for which statements are available ending on or after January 1, 2015 and for which net income is positive, plus 25% of any increase in consolidated net worth of Group during such period attributable to the issuance of ordinary and preferred shares, which at December 31, 2019, was $ 6,246,842 thousand. As of December 31, 2019, the Company was in compliance with all Everest International Credit Facility requirements. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 47,000 £ 47,000 12/31/2023 £ 30,000 £ 26,000 12/31/2022 - - - - Total Lloyd's Bank Credit Facility £ 47,000 £ 47,000 £ 30,000 £ 26,000 Federal Home Loan Bank Membership Effective August 15, 2019, Everest Reinsurance Company (“Everest Re”) became a member of the Federal Home Loan Bank (“FHLB”) organization, which allows Everest Re to borrow up to 10% of its statutory admitted assets. As of December 31, 2019, Everest Re had admitted assets of $ 12,518,844 thousand which provides borrowing capacity of up to $ 1,251,884 thousand. Through December 31, 2019, Everest had no borrowings through the FLHB.

Senior Notes

Senior Notes	12 Months Ended
	Dec. 31, 2019
Senior Notes [Abstract]
Senior Notes	6. SENIOR NOTES The table below displays Holdings’ outstanding senior notes. Market value is based on quoted market prices, but due to limited trading activity, these senior notes are considered Level 2 in the fair value hierarchy. December 31, 2019 December 31, 2018 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value Senior notes 6/5/2014 6/1/2044 400,000 $ 397,074 $ 452,848 $ 396,954 $ 396,968 On June 5, 2014, Holdings issued $ 400,000 thousand of 30 year senior notes at 4.868%, which will mature on June 1, 2044. Interest will be paid semi-annually on June 1 and December 1 of each year. Interest expense incurred in connection with these senior notes is as follows for the periods indicated: Years Ended December 31, (Dollars In thousands 2019 2018 2017 Interest expense incurred $ 19,472 $ 19,472 $ 19,472

Long Term Subordinated Notes

Long Term Subordinated Notes	12 Months Ended
	Dec. 31, 2019
Long Term Subordinated Notes [Abstract]
Long Term Subordinated Notes	7. LONG TERM SUBORDINATED NOTES The table below displays Holdings’ outstanding fixed to floating rate long term subordinated notes. Market value is based on quoted market prices, but due to limited trading activity, these subordinated notes are considered Level 2 in the fair value hierarchy. Maturity Date December 31, 2019 December 31, 2018 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value Long term subordinated notes 4/26/2007 $ 400,000 5/15/2037 5/1/2067 $ 236,758 $ 233,191 $ 236,659 $ 200,390 During the fixed rate interest period from May 3, 2007 May 14, 2017 6.6%, payable semi-annually in arrears on November 15 and May 15 of each year, commencing on November 15, 2007. During the floating rate interest period from May 15, 2017 through maturity, interest will be based on the 3 month LIBOR plus 238.5 basis points, reset quarterly, payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year, subject to Holdings’ right to defer interest on one or more occasions for up to ten 4.3%. Holdings may redeem the long term subordinated notes on or after May 15, 2017, in whole or in part at 100% of the principal amount plus accrued and unpaid interest; however, redemption on or after the scheduled maturity date and prior to May 1, 2047 is subject to a replacement capital covenant. This covenant is for the benefit of certain senior note holders and it mandates that Holdings receive proceeds from the sale of another subordinated debt issue, of at least similar size, before it may redeem the subordinated notes. Effective upon the maturity of the Company’s 5.40% senior notes on October 15, 2014, the Company’s 4.868% senior notes, due on June 1, 2044, have become the Company’s long term indebtedness that ranks senior to the long term subordinated notes. On March 19, 2009, Group announced the commencement of a cash tender offer for any and all of the 6.60% fixed to floating rate long term subordinated notes. Upon expiration of the tender offer, the Company had reduced its outstanding debt by $ 161,441 thousand. Interest expense incurred in connection with these long term subordinated notes is as follows for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Interest expense incurred $ 11,587 $ 10,926 $ 11,498

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	12 Months Ended
	Dec. 31, 2019
Collateralized Reinsurance And Trust Agreements [Abstract]
Collateralized Reinsurance And Trust Agreements	8. COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS Certain subsidiaries of Group have established trust agreements, which effectively use the Company’s investments as collateral, as security for assumed losses payable to certain non-affiliated ceding companies. At December 31, 2019, the total amount on deposit in trust accounts was $ 989,693 thousand. The Company reinsures some of its catastrophe exposures with the segregated accounts of Mt. Logan Re. Mt. Logan Re is a Class 3 insurer registered in Bermuda effective February 27, 2013 under The Segregated Accounts Companies Act 2000 and 100% of the voting common shares are owned by Group. Separate segregated accounts for Mt. Logan Re began being established effective July 1, 2013 and non-voting, redeemable preferred shares have been issued to capitalize the segregated accounts. Each segregated account invests predominantly in a diversified set of catastrophe exposures, diversified by risk/peril and across different geographic regions globally. The following table summarizes the premiums and losses that are ceded by the Company to Mt. Logan Re segregated accounts and assumed by the Company from Mt. Logan Re segregated accounts. Years Ended December 31, Mt. Logan Re Segregated Accounts 2019 2018 2017 (Dollars in thousands) Ceded written premiums 291,979 260,612 245,453 Ceded earned premiums 294,762 262,518 242,793 Ceded losses and LAE 187,192 319,046 320,315 Assumed written premiums 17,005 11,032 25,970 Assumed earned premiums 17,005 11,032 25,970 Assumed losses and LAE - - - Each segregated account is permitted to assume net risk exposures equal to the amount of its available posted collateral, which in the aggregate was $ 993,036 thousand and $ 1,156,853 thousand at December 31, 2019 and 2018, respectively. Of this amount, Group had investments recorded at $ 46,390 thousand and $ 45,625 thousand at December 31, 2019 and 2018, respectively, in the segregated accounts. Effective April 1, 2018, the Company entered into a retroactive reinsurance transaction with one of the Mt. Logan Re segregated accounts to retrocede $ 269,198 thousand of casualty reserves held by Bermuda Re related to accident years 2002 through 2015. As consideration for entering the agreement, the Company transferred cash of $ 252,000 thousand to the Mt. Logan Re segregated account. The maximum liability to be retroceded under the agreement will be $ 319,000 thousand. The Company will retain liability for any amounts exceeding the maximum liability. On April 24, 2014, the Company entered into two collateralized reinsurance agreements with Kilimanjaro Re Limited (“Kilimanjaro”), a Bermuda based special purpose reinsurer, to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover specified named storm and earthquake events. The first agreement provides up to $ 250,000 thousand of reinsurance coverage from named storms in specified states of the Southeastern United States. The second agreement provides up to $ 200,000 thousand of reinsurance coverage from named storms in specified states of the Southeast, Mid-Atlantic and Northeast regions of the United States and Puerto Rico as well as reinsurance coverage from earthquakes in specified states of the Southeast, Mid-Atlantic, Northeast and West regions of the United States, Puerto Rico and British Columbia. These reinsurance agreements expired in April, 2018 On November 18, 2014, the Company entered into a collateralized reinsurance agreement with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. This agreement is a multi-year reinsurance contract which covers specified earthquake events. The agreement provides up to $ 500,000 thousand of reinsurance coverage from earthquakes in the United States, Puerto Rico and Canada. These reinsurance agreements expired in November, 2019 On December 1, 2015 the Company entered into two collateralized reinsurance agreements with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover named storm and earthquake events. The first agreement provides up to $ 300,000 thousand of reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. The second agreement provides up to $ 325,000 thousand of reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. On April 13, 2017 the Company entered into six collateralized reinsurance agreements with Kilimanjaro to provide the Company with annual aggregate catastrophe reinsurance coverage. The initial three agreements are four year reinsurance contracts which cover named storm and earthquake events. These agreements provide up to $ 225,000 thousand, $ 400,000 thousand and $ 325,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. The subsequent three agreements are five year reinsurance contracts which cover named storm and earthquake events. These agreements provide up to $ 50,000 thousand, $ 75,000 thousand and $ 175,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. On April 30, 2018 the Company entered into four collateralized reinsurance agreements with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover named storm and earthquake events. The first two agreements are four year reinsurance contracts which provide up to $ 62,500 thousand and $ 200,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico, the U.S. Virgin Islands and Canada. The remaining two agreements are five year reinsurance contracts which provide up to $ 62,500 thousand and $ 200,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico, the U.S. Virgin Islands and Canada. On December 12, 2019, the Company entered into four collateralized reinsurance agreements with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover named storm and earthquake events. The first two agreements are four year reinsurance contracts which provide up to $ 150,000 thousand and $ 275,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico, the U.S. Virgin Islands and Canada. The remaining two agreements are five year reinsurance contracts which provide up to $ 150,000 thousand and $ 275,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United State, Puerto Rico, the U.S. Virgin Islands and Canada. Recoveries under these collateralized reinsurance agreements with Kilimanjaro are primarily dependent on estimated industry level insured losses from covered events, as well as, the geographic location of the events. The estimated industry level of insured losses is obtained from published estimates by an independent recognized authority on insured property losses. Currently, none of the published insured loss estimates for catastrophe events during the applicable covered periods of the various agreements have exceeded the single event retentions or aggregate retentions under the terms of the agreements that would result in a recovery. Kilimanjaro has financed the various property catastrophe reinsurance coverages by issuing catastrophe bonds to unrelated, external investors. On April 24, 2014, Kilimanjaro issued $ 450,000 thousand of notes (“Series 2014-1 Notes”). The $ 450,000 thousand of Series 2014-1 Notes were fully redeemed on April 30, 2018 and are no longer outstanding. On November 18, 2014, Kilimanjaro issued $ 500,000 thousand of notes (“Series 2014-2 Notes”). On December 1, 2015, Kilimanjaro issued $ 625,000 thousand of notes (“Series 2015-1 Notes”). On April 13, 2017, Kilimanjaro issued $ 950,000 thousand of notes (“Series 2017-1 Notes”) and $ 300,000 thousand of notes (“Series 2017-2 Notes”). On April 30, 2018, Kilimanjaro issued $ 262,500 thousand of notes (“Series 2018-1 Notes”) and $ 262,500 thousand of notes (“Series 2018-2 Notes”). On December 12, 2019, Kilimanjaro issued $ 425,000 thousand of notes (“Series 2019-1 Notes”) and $ 425,000 thousand of notes (“Series 2019-2 Notes”).The proceeds from the issuance of the Notes listed above are held in reinsurance trust throughout the duration of the applicable reinsurance agreements and invested solely in US government money market funds with a rating of at least “AAAm” by Standard & Poor’s.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	9. LEASES Effective January 1, 2019, the Company adopted ASU 2016-02 and ASU 2018-11 which outline new guidance on the accounting for leases. The Company enters into lease agreements for real estate that is primarily used for office space in the ordinary course of business. These leases are accounted for as operating leases, whereby lease expense is recognized on a straight-line basis over the term of the lease. Most leases include an option to extend or renew the lease term. The exercise of the renewal is at the Company’s discretion. The operating lease liability includes lease payments related to options to extend or renew the lease term if the Company is reasonably certain of exercise those options. The Company, in determining the present value of lease payments utilizes either the rate implicit in the lease if that rate is readily determinable or the Company’s incremental secured borrowing rate commensurate with terms of the underlying lease. Supplemental information related to operating leases is as follows for the periods indicated: Year Ended December 31, (Dollars in thousands) 2019 Lease expense incurred: Operating lease cost $ 24,524 At December 31, (Dollars in thousands) 2019 Operating lease right of use assets $ 161,435 Operating lease liabilities 169,909 Year Ended December 31, (Dollars in thousands) 2019 Operating cash flows from operating leases $ ( 20,041) At December 31, 2019 Weighted average remaining operating lease term 12.6 years Weighted average discount rate on operating leases 3.91 % Maturities of the existing lease liabilities are expected to occur as follows: (Dollars in thousands) 2020 $ 19,945 2021 17,153 2022 18,985 2023 18,169 2024 17,872 Thereafter 126,250 Undiscounted lease payments 218,374 Less: present value adjustment 48,465 Total operating lease liability $ 169,909 As of December 31, 2018, the Company accounted for leases per the guidance codified in Accounting Standards Codification, Topic 740-Leases. Based on prior guidance, the future minimum rental commitments, exclusive of cost escalation clauses, at December 31, 2018, for all of the Company’s operating leases were $ 91,841 thousand. The breakdown of the minimum rental commitments as of December 31, 2018, were as follows: $ 18,992 thousand for 2019, $ 18,365 thousand for 2020, $ 9,469 thousand for 2021, $ 9,180 thousand for 2022, $ 8,919 thousand for 2023 and $ 26,916 thousand for all years thereafter. On July 2, 2019, the Company entered into a lease agreement to relocate its corporate offices from Liberty Corner, New Jersey to a corporate complex in Warren, New Jersey. The new lease, which covers approximately 315,000 square feet of office space, became effective in October, 2019 and runs through 2036. The initial base rent payment of the lease will be approximately $ 650 thousand per month or $ 7,800 thousand per year. The Company expects to relocate the existing operations and employees of the Liberty Corner, New Jersey facility to the new corporate complex during 2021.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Taxes [Abstract]
Income Taxes	10. INCOME TAXES Under Bermuda law, no income or capital gains taxes are imposed on Group and its Bermuda Subsidiaries. The Minister of Finance of Bermuda has assured Group and its Bermuda subsidiaries that, pursuant to The Exempted Undertakings Tax Protection Amendment Act of 2011, they will be exempt until 2035 from imposition of any such taxes. All of the income of Group's non-Bermuda subsidiaries is subject to the applicable federal, foreign, state and local taxes on corporations. Additionally, the income of the foreign branches of the Company's insurance operating companies, in particular the UK branch of Bermuda Re, is subject to various rates of income tax. Group's U.S. subsidiaries conduct business in and are subject to taxation in the U.S. Should the U.S. subsidiaries distribute current or accumulated earnings and profits in the form of dividends or otherwise, the Company would be subject to an accrual of 5% U.S. withholding tax. Currently, however, no withholding tax has been accrued with respect to such un-remitted earnings as management has no intention of remitting them. The cumulative amount that would be subject to withholding tax, if distributed, is not practicable to compute. The provision for income taxes in the consolidated statement of operations and comprehensive income (loss) has been determined in accordance with the individual income of each entity and the respective applicable tax laws. The provision reflects the permanent differences between financial and taxable income relevant to each entity. The TCJA, enacted on December 22, 2017, caused the Company to record income tax expense of $ 8,246 thousand in 2017. The income tax expense reflects the lower 21% tax benefit to be realized by the Company under the TCJA upon the reversal of the temporary differences in its deferred tax inventory account versus the 35% tax benefit that had been expected to be realized before TCJA. The significant components of the provision are as follows for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Current tax expense (benefit): U.S. $ ( 5,044) $ ( 38,625) $ ( 117,173) Non-U.S. 14,420 6,497 2,849 Total current tax expense (benefit) 9,376 ( 32,128) ( 114,324) Deferred tax expense (benefit): U.S. 80,247 ( 298,998) 50,207 Non-U.S. ( 97) ( 97) 777 Total deferred tax expense (benefit) 80,150 ( 299,095) 50,984 Total income tax expense (benefit) $ 89,526 $ ( 331,223) $ ( 63,340) (Some amounts may not reconcile due to rounding.) The weighted average expected tax provision has been calculated using the pre-tax income (loss) in each jurisdiction multiplied by that jurisdiction's applicable statutory tax rate. Reconciliation of the difference between the provision for income taxes and the expected tax provision at the weighted average tax rate for the periods indicated is provided below: Years Ended December 31, 2019 2018 2017 (Dollars in thousands) U.S. Non-U.S. U.S. Non-U.S. U.S. Non-U.S. Underwriting gain (loss) $ 38,964 $ 297,199 $ ( 1,407,020) $ 796,745 $ ( 516,167) $ 308,646 Net investment income 325,179 321,960 283,569 297,614 255,310 287,588 Net realized capital gains (losses) 155,609 29,394 ( 90,033) ( 37,103) 148,099 5,095 Net derivative gain (loss) - 6,374 - 520 - 9,581 Corporate expenses ( 13,063) ( 19,903) ( 11,035) ( 19,637) ( 7,394) ( 18,529) Interest, fee and bond issue cost amortization expense ( 34,931) 3,239 ( 30,611) ( 420) ( 31,183) ( 420) Other income (expense) ( 1,976) ( 9,057) ( 5,894) ( 18,877) 32,441 ( 53,656) Pre-tax income (loss) $ 469,782 $ 629,206 $ ( 1,261,024) $ 1,018,842 $ ( 118,894) $ 538,305 Expected tax provision at the applicable statutory rate(s) 98,766 17,205 ( 264,912) 9,647 ( 41,614) 6,843 Increase (decrease) in taxes resulting from: Tax exempt income ( 3,680) - ( 3,824) - ( 8,488) - Dividend received deduction ( 998) - ( 1,520) - ( 4,639) - Proration 1,050 - 1,150 - 1,760 - Affiliated preferred stock dividends 6,517 - 6,517 - 10,861 - Creditable foreign premium tax ( 9,852) - ( 13,475) - ( 7,515) - Tax audit settlement ( 1,576) - ( 2,094) - ( 11,516) - U.S. rate differential on carryback of net operation losses to PY - - ( 43,734) - - - U.S. rate differential on deferred tax 2017 return to provision - - ( 28,411) - - - Share based compensation tax benefits formerly in APIC ( 2,984) ( 373) ( 3,333) ( 120) ( 6,716) ( 235) Impact of U.S. tax reform - - - - 8,246 - Impact of prior year accounting adjustment - - - - ( 8,986) - Change in uncertain tax positions ( 8,434) - 8,434 - - - Other ( 3,606) ( 2,509) 7,579 ( 3,127) 1,641 ( 2,982) Total income tax provision $ 75,203 $ 14,323 $ ( 337,623) $ 6,400 $ ( 66,966) $ 3,626 (Some amounts may not reconcile due to rounding.) Reconciliation of the beginning and ending unrecognized tax benefits, for the periods indicated, is as follows: (Dollars in thousands) 2019 2018 2017 Balance at January 1 $ 8,434 $ - $ - Additions based on tax positions related to the current year - - - Additions for tax positions of prior years - 8,434 - Reductions for tax positions of prior years ( 8,434) - - Settlements with taxing authorities - - - Lapses of applicable statutes of limitations - - - Balance at December 31 $ - $ 8,434 $ - At December 31, 2019, the Company’s unrecognized tax benefits, excluding interest and penalties, that would impact the effective tax rate was $ 0 Interest and penalties related to unrecognized tax benefits are recognized in income tax expense. At December 31, 2019, the Company accrued $ 0 thousand for the payment of interest (net of the federal benefit) and penalties. At December 31, 2019 and 2018, there were no accrued liabilities, respectively, for the payment of interest and penalties. The Company’s 2014 and subsequent U.S. tax years are open to audit by the IRS. In 2018, the IRS opened an audit of the 2014 tax year. To date, the Company has received only one notice of proposed adjustment for an immaterial amount of tax. The Company did propose affirmative beneficial tax return adjustments to the IRS at the start of the audit. In total, the Company expects a net tax refund of $ 34,972 thousand plus net interest of $ 2,421 thousand for the 2014 tax year. The refund is subject to IRS Joint Committee review and approval. In 2019, the IRS opened an audit of the 2015 through 2017 tax years. To date, the Company has not received any Information Document Requests or notices of proposed adjustment. The Company had filed amended tax returns for 2015 and 2016 for $ 1,519 thousand and $ 4,685 thousand respectively. Those refunds, plus accrued interest of $ 978 thousand and $ 247 thousand respectively, will be settled at the conclusion of the audit. Deferred Income taxes reflect the tax effect of the temporary differences between the value of assets and liabilities for financial statement purposes and such values as measured by the U.S. tax laws and regulations. The principal items making up the net deferred income tax assets/(liabilities) are as follows for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 Deferred tax assets: Foreign Tax Credits $ 186,706 $ 167,685 Unearned premium reserves 75,130 63,309 Loss reserves 66,025 64,135 Net operating loss carryforward 31,698 106,543 Net unrealized losses on benefit plans 19,818 17,921 Unrealized foreign currency losses 7,964 12,596 Investment impairments 3,961 1,291 Uncollectible reinsurance reserves 3,142 3,142 Other Tax Credits 2,294 - Net unrealized investment losses - 10,815 Net fair value losses - 7,196 Other assets 13,869 11,521 Total deferred tax assets 410,607 466,154 Deferred tax liabilities: Deferred acquisition costs 81,931 74,736 Net unrealized investment gains 39,413 - Net fair value income 25,936 - Partnership investments 15,039 14,936 Benefit plan asset 2,333 3,600 Other liabilities 4,937 3,868 Total deferred tax liabilities 169,589 97,140 Net deferred tax assets 241,018 369,014 Less: Valuation allowance ( 12,997) ( 9,309) Total net deferred tax assets $ 228,021 $ 359,705 (Some amounts may not reconcile due to rounding.) At December 31, 2019, the Company has $ 186,706 thousand of Foreign Tax Credits (“FTCs”). The FTCs expire in various amounts between 2020 2029 19,027 thousand. This NOL carryforward expires in 2038 In performing our assessment of the recoverability of the Company’s deferred tax assets pursuant to ASC 740, we considered the tax laws governing the utilization of the NOL and FTC carryforwards as well as our other deferred tax assets in each applicable tax jurisdiction. We then evaluated all the positive and negative evidence impacting the realizability of the Company’s deferred tax assets as of December 31, 2019 in the U.S. tax jurisdiction. Evidence considered in the analysis included the Company’s ability to carryback the net operating losses generated in 2017 and 2018 as well as that a company generally must use any remaining net operating loss carryforward before it can utilize its foreign tax credit carryforwards. Consequently, the Company implemented planning actions during 2018, 2019 and early 2020 to increase its planned U.S. source and foreign source income to better enable it to utilize its U.S. deferred tax assets and tax attributes. As of December 31, 2019, based on all available evidence, the Company concluded that it is “more likely than not” that it will use its U.S. NOL and FTC carryforwards prior to their respective expirations and, thus, no valuation allowance has been established in the U.S. jurisdiction. With respect to operations in foreign tax jurisdictions, a valuation allowance of $ 12,671 thousand and $ 9,309 thousand has been recorded in 2019 and 2018, respectively, against the NOL deferred tax assets in its Canadian and UK subsidiaries. The tax-effected Canadian NOLs of $ 2,511 begin to expire in 2035 10,160 do not expire. As a result of the TCJA, the Company recognized an $ 8,246 thousand tax expense in the Company’s Consolidated Statements of Operations for the year ended December 31, 2017. In accordance with SEC Staff Accounting Bulletin 118, in 2017 the Company recorded the effects of the TCJA at that time using reasonable estimates due to the need for further analysis to complete the accounting. During 2018, the Company completed its accounting, including interpretation of additional guidance issued by the IRS and U.S. Department of the Treasury, and recognized an income tax benefit of $ 28,411 thousand primarily related to the 2017 tax return to tax provision true-up recorded in 2018. Effective January 1, 2017, the Company adopted ASU 2016-09 which provided new guidance on the treatment of the tax effects of share based compensation transactions. ASU 2016-09 required that the income tax effects of restricted stock vestings and stock option exercises resulting from the change in value of share based compensation awards between the grant date and settlement (vesting/exercise) date be recorded as part of income tax expense (benefit) within the consolidated statements of operations and comprehensive income (loss). Per the new guidance, the Company recorded excess tax benefits of $ 3,357 thousand, $ 3,453 thousand and $ 6,951 thousand related to restricted stock vestings and stock option exercises as part of income tax expense (benefit) within the consolidated statements of operations and comprehensive income (loss) in 2019, 2018 and 2017, respectively. In years prior to 2017, the Company recorded tax benefits related to restricted stock vestings and stock option exercises as part of additional paid-in capital in the shareholders' equity section of the consolidated balance sheets. The adoption of ASU 2016-09 did not impact the accounting treatment of tax benefits related to dividends on restricted stock. The tax benefits related to the payment of dividends on restricted stock have been recorded as part of additional paid-in capital in the shareholders' equity section of the consolidated balance sheets in all years. The tax benefits related to the payment of dividends on restricted stock were $ 484 thousand, $ 403 thousand and $ 626 thousand in 2019, 2018 and 2017, respectively.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2019
Reinsurance [Abstract]
Reinsurance	11. REINSURANCE The Company utilizes reinsurance agreements to reduce its exposure to large claims and catastrophic loss occurrences. These agreements provide for recovery from reinsurers of a portion of losses and LAE under certain circumstances without relieving the Company of its underlying obligations to the policyholders. Losses and LAE incurred and premiums earned are reported after deduction for reinsurance. In the event that one or more of the reinsurers were unable to meet their obligations under these reinsurance agreements, the Company would not realize the full value of the reinsurance recoverable balances. The Company may hold partial collateral, including letters of credit and funds held, under these agreements. See also Note 1C, Note 3 and Note 8. Premiums written and earned and incurred losses and LAE are comprised of the following for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Written premiums: Direct $ 2,783,036 $ 2,240,951 $ 2,083,555 Assumed 6,350,328 6,234,203 5,090,367 Ceded ( 1,308,940) ( 1,060,726) ( 929,261) Net written premiums $ 7,824,424 $ 7,414,428 $ 6,244,661 Premiums earned: Direct $ 2,551,662 $ 2,129,320 $ 1,825,705 Assumed 6,059,222 5,807,332 4,945,522 Ceded ( 1,207,198) ( 1,004,953) ( 833,387) Net premiums earned $ 7,403,686 $ 6,931,699 $ 5,937,840 Incurred losses and LAE: Direct $ 1,618,686 $ 1,372,589 $ 1,311,682 Assumed 3,923,298 5,046,947 3,909,816 Ceded ( 619,086) ( 768,133) ( 698,917) Net incurred losses and LAE $ 4,922,898 $ 5,651,403 $ 4,522,581

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2019
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	12. OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the components of comprehensive income (loss) in the consolidated statements of operations for the periods indicated: Years Ended December 31, 2019 2019 2018 2017 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ 547,539 $ ( 49,665) $ 497,874 $ ( 275,511) $ 21,061 $ ( 254,450) $ ( 81,915) $ 21,597 $ ( 60,318) URA(D) on securities - OTTI ( 1,559) 115 ( 1,444) ( 1,071) ( 135) ( 1,206) ( 5,618) 1,588 ( 4,030) Reclassification of net realized losses (gains) included in net income (loss) ( 13,129) 516 ( 12,613) 28,014 ( 518) 27,496 ( 7,258) 308 ( 6,950) Foreign currency translation adjustments 18,585 ( 4,555) 14,030 ( 86,520) 9,704 ( 76,816) 142,054 ( 20,137) 121,917 Benefit plan actuarial net gain (loss) ( 15,938) 3,347 ( 12,591) ( 646) 136 ( 510) 1,300 ( 273) 1,027 Reclassification of benefit plan liability amortization included in net income (loss) 6,902 ( 1,449) 5,453 6,356 ( 1,335) 5,021 8,426 ( 2,949) 5,477 Total other comprehensive income (loss) $ 542,400 $ ( 51,691) $ 490,709 $ ( 329,378) $ 28,913 $ ( 300,465) $ 56,989 $ 134 $ 57,123 The following table presents details of the amounts reclassified from AOCI for the periods indicated: Years Ended December 31, Affected line item within the statements of AOCI component 2019 2018 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 13,129) $ 28,014 Other net realized capital gains (losses) 516 ( 518) Income tax expense (benefit) $ ( 12,613) $ 27,496 Net income (loss) Benefit plan net gain (loss) $ 6,902 $ 6,356 Other underwriting expenses ( 1,449) ( 1,335) Income tax expense (benefit) $ 5,453 $ 5,021 Net income (loss) The following table presents the components of accumulated other comprehensive income (loss), net of tax, in the consolidated balance sheets for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 Beginning balance of URA (D) on securities $ ( 179,392) $ 49,969 Change to beginning balance due to adoption of ASU 2016-01 - ( 1,201) Current period change in URA (D) of investments - temporary 485,261 ( 226,954) Current period change in URA (D) of investments - non-credit OTTI ( 1,444) ( 1,206) Ending balance of URA (D) on securities 304,425 ( 179,392) Beginning balance of foreign currency translation adjustments ( 215,747) ( 138,931) Current period change in foreign currency translation adjustments 14,030 ( 76,816) Ending balance of foreign currency translation adjustments ( 201,717) ( 215,747) Beginning balance of benefit plan net gain (loss) ( 67,418) ( 71,929) Current period change in benefit plan net gain (loss) ( 7,138) 4,511 Ending balance of benefit plan net gain (loss) ( 74,556) ( 67,418) Ending balance of accumulated other comprehensive income (loss) $ 28,152 $ ( 462,557) (Some amounts may not reconcile due to rounding.)

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Employee Benefit Plans [Abstract]
Employee Benefit Plans	13. EMPLOYEE BENEFIT PLANS Defined Benefit Pension Plans. The Company maintains both qualified and non-qualified defined benefit pension plans for its U.S. employees employed prior to April 1, 2010. Generally, the Company computes the benefits based on average earnings over a period prescribed by the plans and credited length of service. The Company’s non-qualified defined benefit pension plan provided compensating pension benefits for participants whose benefits have been curtailed under the qualified plan due to Internal Revenue Code limitations. Effective January 1, 2018, participants of the Company’s non-qualified defined benefit pension plan may no longer accrue additional service benefits. Although not required to make contributions under IRS regulations, the following table summarizes the Company’s contributions to the defined benefit pension plans for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Company contributions $ 4,750 $ 77,743 $ 10,534 The following table summarizes the Company’s pension expense for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Pension expense $ 10,042 $ 9,728 $ 16,299 The following table summarizes the status of these defined benefit plans for U.S. employees for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 Change in projected benefit obligation: Benefit obligation at beginning of year $ 300,244 $ 316,202 Service cost 8,255 9,801 Interest cost 11,712 10,290 Actuarial (gain)/loss 46,206 ( 29,966) Curtailment - - Benefits paid ( 11,062) ( 6,084) Projected benefit obligation at end of year 355,356 300,244 Change in plan assets: Fair value of plan assets at beginning of year 260,531 210,267 Actual return on plan assets 47,247 ( 21,395) Actual contributions during the year 4,750 77,743 Administrative expenses paid - - Benefits paid ( 11,062) ( 6,084) Fair value of plan assets at end of year 301,467 260,531 Funded status at end of year $ ( 53,889) $ ( 39,713) (Some amounts may not reconcile due to rounding.) Amounts recognized in the consolidated balance sheets for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Other assets (due beyond one year) $ - $ - Other liabilities (due within one year) ( 7,362) ( 7,530) Other liabilities (due beyond one year) ( 46,527) ( 32,182) Net amount recognized in the consolidated balance sheets $ ( 53,889) $ ( 39,713) (Some amounts may not reconcile due to rounding.) Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Accumulated income (loss) $ ( 97,466) $ ( 88,580) Accumulated other comprehensive income (loss) $ ( 97,466) $ ( 88,580) (Some amounts may not reconcile due to rounding.) Other changes in other comprehensive income (loss) for the periods indicated are as follows: Years Ended December 31, (Dollars in thousands) 2019 2018 Other comprehensive income (loss) at December 31, prior year $ ( 88,580) $ ( 86,788) Net gain (loss) arising during period ( 16,927) ( 8,631) Recognition of amortizations in net periodic benefit cost: Actuarial loss 8,042 6,839 Curtailment loss recognized - - Other comprehensive income (loss) at December 31, current year $ ( 97,466) $ ( 88,580) (Some amounts may not reconcile due to rounding.) Net periodic benefit cost for U.S. employees included the following components for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Service cost $ 8,255 $ 9,801 $ 10,949 Interest cost 11,712 10,290 10,034 Expected return on assets ( 17,968) ( 17,202) ( 13,050) Amortization of actuarial loss from earlier periods 7,635 6,839 8,366 Settlement 408 - - Net periodic benefit cost $ 10,042 $ 9,728 $ 16,299 Other changes recognized in other comprehensive income (loss): Other comprehensive income (loss) attributable to change from prior year 8,885 1,792 Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 18,927 $ 11,520 (Some amounts may not reconcile due to rounding.) The estimated transition obligation, actuarial loss and prior service cost that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next year are $ 0 thousand, $ 9,461 thousand and $ 0 thousand, respectively. The weighted average discount rates used to determine net periodic benefit cost for 2019, 2018 and 2017 were 4.27%, 3.62% and 4.16%, respectively. The rate of compensation increase used to determine the net periodic benefit cost for 2019, 2018 and 2017 was 4.00%. The expected long-term rate of return on plan assets was 7.00% for 2019, 7.00% for 2018 and was 7.50% for 2017 based on expected portfolio returns and allocations. The weighted average discount rates used to determine the actuarial present value of the projected benefit obligation for years end 2019, 2018 and 2017 were 3.28%, 4.27% and 3.62%, respectively. The following table summarizes the accumulated benefit obligation for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Qualified Plan $ 288,328 $ 237,855 Non-qualified Plan 21,642 24,472 Total $ 309,970 $ 262,327 (Some amounts may not reconcile due to rounding.) The following table displays the plans with projected benefit obligations in excess of plan assets for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Qualified Plan Projected benefit obligation $ 333,715 $ 275,772 Fair value of plan assets 301,467 260,531 Non-qualified Plan Projected benefit obligation $ 21,642 $ 24,472 Fair value of plan assets - - The following table displays the plans with accumulated benefit obligations in excess of plan assets for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Qualified Plan Accumulated benefit obligation $ - $ - Fair value of plan assets - - Non-qualified Plan Accumulated benefit obligation $ 21,642 $ 24,472 Fair value of plan assets - - The following table displays the expected benefit payments in the periods indicated: (Dollars in thousands) 2019 15,670 2020 11,458 2021 12,198 2022 12,902 2023 13,985 Next 5 years 84,334 Plan assets consist of shares in investment trusts with 62%, 30%, 7% and 1% of the underlying assets consisting of equity securities, fixed maturities, limited partnerships and multi-strategy equity funds and cash, respectively. The Company manages the qualified plan investments for U.S. employees. The assets in the plan consist of debt and equity mutual funds. Due to the long term nature of the plan, the target asset allocation has historically been 70% equities and 30% bonds. The following tables present the fair value measurement levels for the qualified plan assets at fair value for the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 1,749 $ 1,749 $ - $ - Mutual funds, fair value Fixed income (b) 90,483 90,483 - - Equities (c) 188,884 188,884 - - Total $ 281,116 $ 281,116 $ - $ - (Some amounts may not reconcile due to rounding.) (a) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70% in U.S. securities and 30% in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50% in U.S. equities and 50% in international equities. There were no transfers between Level 1 and Level 2 for the twelve months ended December 31, 2018. Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 2,872 $ 2,872 $ - $ - Mutual funds, fair value Fixed income (b) 82,633 82,633 - - Equities (c) 154,935 154,935 - - Total $ 240,440 $ 240,440 $ - $ - (Some amounts may not reconcile due to rounding.) (a) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70% in U.S. securities and 30% in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50% in U.S. equities and 50% in international equities. In addition, $ 20,351 thousand and $ 20,091 thousand of investments which were recorded as part of the qualified plan assets at December 31, 2019 and 2018, respectively, are not included within the fair value hierarchy tables as the assets are valued using the NAV practical expedient guidance within ASU 2015-07. The Company contributed $ 0 77,000 thousand to the qualified pension benefit plan for the years ended December 31, 2019 and 2018, respectively. Defined Contribution Plans. The Company also maintains both qualified and non-qualified defined contribution plans (“Savings Plan” and “Non-Qualified Savings Plan”, respectively) covering U.S. employees. Under the plans, the Company contributes up to a maximum 3% of the participants’ compensation based on the contribution percentage of the employee. The Non-Qualified Savings Plan provides compensating savings plan benefits for participants whose benefits have been curtailed under the Savings Plan due to Internal Revenue Code limitations. In addition, effective for new hires (and rehires) on or after April 1, 2010, the Company will contribute between 3% and 8% of an employee’s earnings for each payroll period based on the employee’s age. These contributions will be 100% vested after three years. The following table presents the Company’s incurred expenses related to these plans for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Incurred expenses $ 10,794 $ 9,301 $ 7,167 In addition, the Company maintains several defined contribution pension plans covering non-U.S. employees. Each non-U.S. office (Brazil, Canada, London, Belgium, Singapore, Ireland, Zurich and Bermuda) maintains a separate plan for the non-U.S. employees working in that location. The Company contributes various amounts based on salary, age and/or years of service. In the current year, the contributions as a percentage of salary for the branch offices ranged from 4.9% to 45.7%. The contributions are generally used to purchase pension benefits from local insurance providers. The following table presents the Company’s incurred expenses related to these plans for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Incurred expenses $ 2,216 $ 2,057 $ 1,849 Post-Retirement Plan. The Company sponsors a Retiree Health Plan for employees employed prior to April 1, 2010. This plan provides healthcare benefits for eligible retired employees (and their eligible dependants), who have elected coverage. The Company anticipates that most covered employees will become eligible for these benefits if they retire while working for the Company. The cost of these benefits is shared with the retiree. The Company accrues the post-retirement benefit expense during the period of the employee’s service. A medical cost trend rate of 7.00% in 2019 was assumed to decrease gradually to 4.50% in 2029 and then remain at that level. Changes in the assumed healthcare cost trend can have a significant effect on the amounts reported for the healthcare plans. A one percent change in the rate would have the following effects on: Percentage Percentage Point Increase Point Decrease (Dollars in thousands) ($ Impact) ($ Impact) a. Effect on total service and interest cost components $ 434 $ ( 335) b. Effect on accumulated post-retirement benefit obligation 6,257 ( 4,833) The following table presents the post-retirement benefit expenses for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Post-retirement benefit expenses $ 1,231 $ 1,829 $ 2,814 The following table summarizes the status of this plan for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Change in projected benefit obligation: Benefit obligation at beginning of year $ 28,483 $ 34,717 Service cost 983 1,312 Interest cost 980 999 Amendments ( 582) - Actuarial (gain)/loss - ( 7,985) Benefits paid ( 488) ( 561) Benefit obligation at end of year 29,376 28,483 Change in plan assets: Fair value of plan assets at beginning of year - - Employer contributions 488 561 Benefits paid ( 488) ( 561) Fair value of plan assets at end of year - - Funded status at end of year $ ( 29,376) $ ( 28,483) Amounts recognized in the consolidated balance sheets for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Other liabilities (due within one year) $ ( 611) $ ( 608) Other liabilities (due beyond one year) ( 28,764) ( 27,875) Net amount recognized in the consolidated balance sheets $ ( 29,376) $ ( 28,483) (Some amounts may not reconcile due to rounding.) Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 Accumulated income (loss) $ 188 $ ( 238) Accumulated prior service credit (cost) 2,904 3,480 Accumulated other comprehensive income (loss) $ 3,092 $ 3,242 Other changes in other comprehensive income (loss) for the periods indicated are as follows: Years Ended December 31, (Dollars in thousands) 2019 2018 Other comprehensive income (loss) at December 31, prior year $ 3,242 $ ( 4,260) Net gain (loss) arising during period 582 7,985 Prior Service credit (cost) arising during period - - Recognition of amortizations in net periodic benefit cost: Actuarial loss (gain) ( 155) 94 Prior service cost ( 577) ( 577) Other comprehensive income (loss) at December 31, current year $ 3,092 $ 3,242 Net periodic benefit cost included the following components for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Service cost $ 983 $ 1,312 $ 1,570 Interest cost 980 999 1,184 Prior service credit recognition ( 577) ( 577) ( 131) Net gain recognition ( 155) 94 192 Net periodic cost $ 1,231 $ 1,829 $ 2,814 Other changes recognized in other comprehensive income (loss): Other comprehensive gain (loss) attributable to change from prior year 150 ( 7,502) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 1,381 $ ( 5,673) (Some amounts may not reconcile due to rounding.) The estimated transition obligation, actuarial loss and prior service credit that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year are $ 0 thousand, $ 0 thousand and ($ 577) thousand, respectively. The weighted average discount rates used to determine net periodic benefit cost for 2019, 2018 and 2017 were 4.27 %, 3.62% and 4.16%, respectively. The weighted average discount rates used to determine the actuarial present value of the projected benefit obligation at year end 2019, 2018 and 2017 were 3.28%, 4.27% and 3.62%, respectively. The following table displays the expected benefit payments in the years indicated: (Dollars in thousands) 2019 $ 611 2020 673 2021 768 2022 851 2023 896 Next 5 years 6,377

Dividend Restrictions And Statu

Dividend Restrictions And Statutory Financial Information	12 Months Ended
	Dec. 31, 2019
Dividend Restrictions And Statutory Financial Information [Abstract]
Dividend Restrictions And Statutory Financial Information	14. DIVIDEND RESTRICTIONS AND STATUTORY FINANCIAL INFORMATION Group and its operating subsidiaries are subject to various regulatory restrictions, including the amount of dividends that may be paid and the level of capital that the operating entities must maintain. These regulatory restrictions are based upon statutory capital as opposed to GAAP basis equity or net assets. Group and one of its primary operating subsidiaries, Bermuda Re, are regulated by Bermuda law and its other primary operating subsidiary, Everest Re, is regulated by Delaware law. Bermuda Re is subject to the Bermuda Solvency Capital Requirement (“BSCR”) administered by the Bermuda Monetary Authority (“BMA”) and Everest Re is subject to the Risk-Based Capital Model (“RBC”) developed by the National Association of Insurance Commissioners (“NAIC”). These models represent the aggregate regulatory restrictions on net assets and statutory capital and surplus. Dividend Restrictions. Under Bermuda law, Group is prohibited from declaring or paying a dividend if such payment would reduce the realizable value of its assets to an amount less than the aggregate value of its liabilities and its issued share capital and share premium (additional paid-in capital) accounts. Group’s ability to pay dividends and its operating expenses is dependent upon dividends from its subsidiaries. Under Bermuda law, Bermuda Re is prohibited from declaring or making payment of a dividend if it fails to meet its minimum solvency margin or minimum liquidity ratio. As a long term insurer, Bermuda Re is also unable to declare or pay a dividend to anyone who is not a policyholder unless, after payment of the dividend, the value of the assets in their long term business fund, as certified by their approved actuary, exceeds their liabilities for long term business by at least the $ 250 thousand minimum solvency margin. Prior approval of the BMA is required if Bermuda Re’s dividend payments would exceed 25% of their prior year-end total statutory capital and surplus. Bermuda Re prepares its statutory financial statements in conformity with the accounting principles set forth in Bermuda in The Insurance Act 1978, amendments thereto and related regulations. The statutory capital and surplus of Bermuda Re was $ 3,197,418 thousand and $ 3,068,534 thousand at December 31, 2019 and 2018, respectively. The statutory net income of Bermuda Re was $ 503,610 thousand, $ 873,111 thousand and $ 582,128 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. Delaware law provides that an insurance company which is a member of an insurance holding company system and is domiciled in the state shall not pay dividends without giving prior notice to the Insurance Commissioner of Delaware and may not pay dividends without the approval of the Insurance Commissioner if the value of the proposed dividend, together with all other dividends and distributions made in the preceding twelve months, exceeds the greater of (1) 10% of statutory surplus or (2) net income, not including realized capital gains, each as reported in the prior year’s statutory annual statement. In addition, no dividend may be paid in excess of unassigned earned surplus. At December 31, 2019, Everest Re has $ 373,914 thousand available for payment of dividends in 2020 without the need for prior regulatory approval. Everest Re prepares its statutory financial statements in accordance with accounting practices prescribed or permitted by the NAIC and the Delaware Insurance Department. Prescribed statutory accounting practices are set forth in the NAIC Accounting Practices and Procedures Manual. The capital and statutory surplus of Everest Re was $ 3,739,140 thousand and $ 3,650,594 thousand at December 31, 2019 and 2018, respectively. The statutory net income of Everest Re was $ 363,034 thousand for the year ended December 31, 2019, and statutory net loss of Everest Re was $ 1,317,991 thousand and $ 391,419 thousand for the years ended December 31, 2018 and 2017, respectively. There are certain regulatory and contractual restrictions on the ability of Holdings’ operating subsidiaries to transfer funds to Holdings in the form of cash dividends, loans or advances. The insurance laws of the State of Delaware, where Holdings’ direct insurance subsidiaries are domiciled, require regulatory approval before those subsidiaries can pay dividends or make loans or advances to Holdings that exceed certain statutory thresholds. Capital Restrictions. In Bermuda, Bermuda Re is subject to the BSCR administered by the BMA. No regulatory action is taken if an insurer’s capital and surplus is equal to or in excess of their enhanced capital requirement determined by the BSCR model. In addition, the BMA has established a target capital level for each insurer, which is 120% of the enhanced capital requirement. In the United States, Everest Re is subject to the RBC developed by the NAIC which determines an authorized control level risk-based capital. As long as the total adjusted capital is 200% or more of the authorized control level capital, no action is required by the Company. The regulatory targeted capital and the actual statutory capital for Bermuda Re and Everest Re were as follows: Bermuda Re (1) Everest Re (1) At December 31, At December 31, (Dollars in thousands) 2019 (1) 2018 2019 2018 Regulatory targeted capital $ - $ 1,753,156 $ 2,001,226 $ 2,172,958 Actual capital $ 3,197,418 $ 3,068,534 $ 3,739,140 $ 3,650,594 (a) Regulatory targeted capital represents the target capital level from the applicable year's BSCR calculation. (b) Regulatory targeted capital represents 200% of the RBC authorized control level calculation for the applicable year. (c) The 2019 BSCR calculation is not yet due to be completed; however, the Company anticipates that Bermuda Re's December 31, 2019 actual capital will exceed the targeted capital level.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Commitments And Contingencies	15. COMMITMENTS AND CONTINGENCIES In the ordinary course of business, the Company is involved in lawsuits, arbitrations and other formal and informal dispute resolution procedures, the outcomes of which will determine the Company’s rights and obligations under insurance and reinsurance agreements. In some disputes, the Company seeks to enforce its rights under an agreement or to collect funds owing to it. In other matters, the Company is resisting attempts by others to collect funds or enforce alleged rights. These disputes arise from time to time and are ultimately resolved through both informal and formal means, including negotiated resolution, arbitration and litigation. In all such matters, the Company believes that its positions are legally and commercially reasonable. The Company considers the statuses of these proceedings when determining its reserves for unpaid loss and loss adjustment expenses. Aside from litigation and arbitrations related to these insurance and reinsurance agreements, the Company is not a party to any other material litigation or arbitration. The Company has entered into separate annuity agreements with The Prudential Insurance of America (“The Prudential”) and an additional unaffiliated life insurance company in which the Company has either purchased annuity contracts or become the assignee of annuity proceeds that are meant to settle claim payment obligations in the future. In both instances, the Company would become contingently liable if either The Prudential or the unaffiliated life insurance company were unable to make payments related to the respective annuity contract. The table below presents the estimated cost to replace all such annuities for which the Company was contingently liable for the periods indicated: At December 31, (Dollars in thousands) 2019 2018 The Prudential $ 141,703 $ 142,754 Unaffiliated life insurance company 35,082 34,717

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2019
Share-Based Compensation Plans [Abstract]
Share-Based Compensation Plans	16. SHARE-BASED COMPENSATION PLANS The Company has a 2010 Stock Incentive Plan (“2010 Employee Plan”), a 2009 Non-Employee Director Stock Option and Restricted Stock Plan (“2009 Director Plan”) and a 2003 Non-Employee Director Equity Compensation Plan (“2003 Director Plan”). Under the 2010 Employee Plan, 4,000,000 common shares have been authorized to be granted as non-qualified share options, incentive share options, share appreciation rights, restricted share awards or performance share unit awards to officers and key employees of the Company. At December 31, 2019, there were 2,303,555 remaining shares available to be granted under the 2010 Employee Plan. The 2010 Employee Plan replaced a 2002 Employee Plan, which replaced a 1995 Employee Plan; therefore, no 37,439 common shares have been authorized to be granted as share options or restricted share awards to non-employee directors of the Company. At December 31, 2019, there were 34,957 remaining shares available to be granted under the 2009 Director Plan. The 2009 Director Plan replaced a 1995 Director Plan, which expired. Under the 2003 Director Plan, 500,000 common shares have been authorized to be granted as share options or share awards to non-employee directors of the Company. At December 31, 2019 there were 324,913 remaining shares available to be granted under the 2003 Director Plan. Options and restricted shares granted under the 2010 Employee Plan and the 2002 Employee Plan vest at the earliest of 20% per year over five years or in accordance with any applicable employment agreement. Options and restricted shares granted under the 2003 Director Plan generally vest at 33% per year over three years, unless an alternate vesting period is authorized by the Board. Options and restricted shares granted under the 2009 Director Plan will vest as provided in the award agreement. All options are exercisable at fair market value of the stock at the date of grant and expire ten years after the date of grant. Performance Share Unit awards granted under the 2010 Employee Plan will vest 100% after three years. The Performance Share Unit awards represent the right to receive between and 0 1.75 shares of stock for each unit awarded depending upon performance in relation to certain metrics. The performance share unit valuation will be based 50% on growth in book value per share over the three year vesting period, compared to designated peer companies. The remaining 50% of the performance share valuation will be based upon operating return on equity for each of the separate operating years within the vesting period. For share options, restricted shares and performance share units granted under the 2010 Employee Plan, the 2002 Employee Plan, the 2009 Director Plan and the 2003 Director Plan, share-based compensation expense recognized in the consolidated statements of operations and comprehensive income (loss) was $ 34,018 thousand, $ 32,369 thousand and $ 30,297 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. The corresponding income tax benefit recorded in the consolidated statements of operations and comprehensive income (loss) for share-based compensation was $ 8,384 thousand, $ 7,401 thousand and $ 14,824 thousand for the years ended December 31, 2019, 2018 and 2017, respectively. In accordance with ASU 2016-09, the income tax effect resulting from the change in the value of share based compensation awards between grant date and settlement date has been recorded as part of the income tax benefit in the consolidation statements of operations and comprehensive income (loss) effective January 1, 2017. Prior to that date, the income tax impact of the change in value of share based compensation awards between grant date and settlement date was recorded within additional paid in capital in the Consolidated Balance Sheets. For the year ended December 31, 2019, a total of 232,601 restricted shares were granted on February 27, 2019, May 15, 2019, May 23, 2019, September 18, 2019, and November 19, 2019, with a fair value of $223.45, $247.93, $249.83, $260.555 and $266.2325 per share, respectively. Additionally, 16,855 performance share units were awarded on February 27, 2019, with a fair value of $223.45 per unit. No The Company recognizes, as an increase to additional paid-in capital, a realized income tax benefit from dividends, charged to retained earnings and paid to employees on equity classified non-vested equity shares. In addition, the amount recognized in additional paid-in capital for the realized income tax benefit from dividends on those awards is included in the pool of excess tax benefits available to absorb tax deficiencies on share-based payment awards. For the years ended December 31, 2019, 2018 and 2017, the Company recognized $ 484 thousand, $ 403 thousand and $ 626 thousand, respectively, of additional paid-in capital due to tax benefits from dividends on restricted shares. A summary of the option activity under the Company’s shareholder approved plans as of December 31, 2019, 2018 and 2017, and changes during the year then ended is presented in the following tables: Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2019 279,164 $ 83.84 Granted – - Exercised 108,460 78.58 Forfeited/Cancelled/Expired – - Outstanding at December 31, 2019 170,704 87.18 1.4 $ 32,376 . Exercisable at December 31, 2019 170,704 87.18 1.4 $ 32,376 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2018 360,364 $ 84.10 Granted - - Exercised 81,200 84.99 Forfeited/Cancelled/Expired - - Outstanding at December 31, 2018 279,164 83.84 1.9 $ 37,386 Exercisable at December 31, 2018 279,164 83.84 1.9 $ 37,386 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2017 454,994 $ 84.88 Granted - - Exercised 94,630 87.84 Forfeited/Cancelled/Expired - - Outstanding at December 31, 2017 360,364 84.10 2.7 $ 49,428 Exercisable at December 31, 2017 360,364 84.10 2.7 $ 49,428 There were no 16,297 thousand, $ 11,737 thousand and $ 14,130 thousand, respectively. The cash received from the exercised share options for the year ended December 31, 2019 was $ 8,523 thousand. The tax benefit realized from the options exercised for the year ended December 31, 2019 was $ 3,198 thousand. The following table summarizes information about share options outstanding for the period indicated: At December 31, 2019 Options Outstanding Opotions Exercisable Weighted- Average Weighted- Weighted- Number Remaining Average Number Average Range of Outstanding Contractual Exercise Exercisable Exercise Exercise Prices at 12/31/19 Life Price at 12/31/19 Price $ 84.6300 - $ 85.6300 31,100 0.2 $ 84.63 31,100 $ 84.63 $ 85.6400 - $ 87.4700 59,900 1.2 86.62 59,900 86.62 $ 87.4800 - $ 89.4100 73,750 2.1 88.32 73,750 88.32 $ 89.4200 - $ 110.1300 5,954 1.5 91.99 5,954 91.99 170,704 1.4 87.18 170,704 87.18 The following table summarizes the status of the Company’s non-vested shares and changes for the periods indicated: Years Ended December 31, 2019 2018 2017 Weighted- Weighted- Weighted- Average Average Average Grant Date Grant Date Grant Date Restricted (non-vested) Shares Shares Fair Value Shares Fair Value Shares Fair Value Outstanding at January 1, 414,407 $ 217.15 421,261 $ 194.01 435,338 $ 164.21 Granted 232,601 - 173,065 240.59 160,185 234.01 Vested 138,322 - 141,982 178.31 152,397 151.80 Forfeited 13,549 - 37,937 212.48 21,865 187.82 Outstanding at December 31, 495,137 - 414,407 217.15 421,261 194.01 As of December 31, 2019, there was $ 79,780 thousand of total unrecognized compensation cost related to non-vested share-based compensation expense. That cost is expected to be recognized over a weighted-average period of 3.4 years. The total fair value of shares vested during the years ended December 31, 2019, 2018 and 2017, was $ 28,135 thousand, $ 25,317 thousand and $ 23,134 thousand, respectively. The tax benefit realized from the shares vested for the year ended December 31, 2019 was $ 5,774 thousand. In addition to the 2010 Employee Plan, the 2009 Director Plan and the 2003 Director Plan, Group issued 459 common shares in 2019, 480 common shares in 2018 and 404 common shares in 2017 to the Company’s non-employee directors as compensation for their service as directors. These issuances had aggregate values of approximately $ 107 thousand, $ 113 thousand and $ 94 thousand, respectively. Since its 1995 initial public offering, the Company has issued to certain key employees of the Company 2,525,422 restricted common shares, of which 331,938 restricted shares have been cancelled. The Company has issued to non-employee directors of the Company 167,618 restricted common shares, of which no restricted shares have been cancelled. The Company acquired 71,437, 65,974 and 60,453 common shares at a cost of $ 14,181 thousand, $ 14,202 thousand and $ 14,240 thousand in 2019, 2018 and 2017, respectively, from employees who chose to pay required withholding taxes and/or the exercise cost on option exercises or restricted share vestings by withholding shares. The following table summarized the status of the Company’s non-vested performance share unit awards and changes for the period indicated: Years Ended December 31, 2019 2018 2017 Weighted- Weighted- Weighted- Average Average Average Grant Date Grant Date Grant Date Performance Share Unit Awards Shares Fair Value Shares Fair Value Shares Fair Value Outstanding at January 1, 32,382 $ - 33,454 $ - 21,223 $ - Granted 16,855 223.45 13,325 242.39 11,245 234.03 Increase/(Decrease) on vesting units due to performance ( 3,455) - ( 267) - 986 - Vested 10,922 223.45 12,435 242.39 - - Forfeited - - 1,695 - - - Outstanding at December 31, 34,850 - 32,382 - 33,454 - The Company acquired 5,008 and 5,214 common shares at a cost of $ 1,119 thousand and $ 1,264 thousand in 2019 and 2018, respectively, from employees who chose to pay required withholding taxes on performance shares units settlements by withholding shares.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Reporting	17. SEGMENT REPORTING The U.S. Reinsurance operation writes property and casualty reinsurance and specialty lines of business, including Marine, Aviation, Surety and Accident and Health (“A&H”) business, on both a treaty and facultative basis, through reinsurance brokers, as well as directly with ceding companies primarily within the U.S. The International operation writes non-U.S. property and casualty reinsurance through Everest Re’s branches in Canada and Singapore and through offices in Brazil, Miami and New Jersey. The Bermuda operation provides reinsurance and insurance to worldwide property and casualty markets through brokers and directly with ceding companies from its Bermuda office and reinsurance to the United Kingdom and European markets through its UK branch and Ireland Re. The Insurance operation writes property and casualty insurance directly and through brokers, surplus lines brokers and general agents within the U.S., Canada and Europe. These segments are managed independently, but conform with corporate guidelines with respect to pricing, risk management, control of aggregate catastrophe exposures, capital, investments and support operations. Management generally monitors and evaluates the financial performance of these operating segments based upon their underwriting results. Underwriting results include earned premium less losses and loss adjustment expenses (“LAE”) incurred, commission and brokerage expenses and other underwriting expenses. We measure our underwriting results using ratios, in particular loss, commission and brokerage and other underwriting expense ratios, which, respectively, divide incurred losses, commissions and brokerage and other underwriting expenses by premiums earned. For inter-affiliate reinsurance and business written through the Lloyd’s Syndicate, business is generally reported within the segment in which the business was first produced, consistent with how the business is managed. The Company does not maintain separate balance sheet data for its operating segments. Accordingly, the Company does not review and evaluate the financial results of its operating segments based upon balance sheet data. The following tables present the underwriting results for the operating segments for the periods indicated: U.S. Reinsurance Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 2,962,416 $ 3,014,338 $ 2,592,972 Net written premiums 2,513,579 2,642,182 2,245,422 Premiums earned $ 2,471,447 $ 2,528,991 $ 2,181,160 Incurred losses and LAE 1,514,151 2,784,181 1,632,795 Commission and brokerage 703,803 568,374 462,487 Other underwriting expenses 68,796 60,266 55,881 Underwriting gain (loss) $ 184,697 $ ( 883,830) $ 29,997 International Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 1,648,598 $ 1,543,946 $ 1,316,701 Net written premiums 1,551,753 1,458,745 1,229,597 Premiums earned $ 1,475,669 $ 1,439,882 $ 1,202,043 Incurred losses and LAE 1,193,816 992,704 1,059,640 Commission and brokerage 342,400 364,010 287,688 Other underwriting expenses 41,690 39,042 38,844 Underwriting gain (loss) $ ( 102,237) $ 44,126 $ ( 184,129) Bermuda Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 1,744,875 $ 1,666,317 $ 1,205,001 Net written premiums 1,666,940 1,605,526 1,139,082 Premiums earned $ 1,544,180 $ 1,324,198 $ 1,093,250 Incurred losses and LAE 967,211 808,717 735,292 Commission and brokerage 354,044 319,197 303,707 Other underwriting expenses 50,348 43,566 38,011 Underwriting gain (loss) $ 172,577 $ 152,718 $ 16,240 Insurance Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 2,777,475 $ 2,250,552 $ 2,059,248 Net written premiums 2,092,152 1,707,975 1,630,560 Premiums earned $ 1,912,390 $ 1,638,628 $ 1,461,387 Incurred losses and LAE 1,247,720 1,065,801 1,094,854 Commission and brokerage 303,479 267,449 250,081 Other underwriting expenses 280,065 228,667 186,081 Underwriting gain (loss) $ 81,126 $ 76,711 $ ( 69,629) The following table reconciles the underwriting results for the operating segments to income before taxes as reported in the consolidated statements of operations and comprehensive income (loss) for the periods indicated: Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Underwriting gain (loss) $ 336,163 $ ( 610,275) $ ( 207,521) Net investment income 647,139 581,183 542,898 Net realized capital gains (losses) 185,004 ( 127,136) 153,194 Net derivative gain (loss) 6,374 520 9,581 Corporate expenses ( 32,966) ( 30,672) ( 25,923) Interest, fee and bond issue cost amortization expense ( 31,693) ( 31,031) ( 31,603) Other income (expense) ( 11,034) ( 24,771) ( 21,215) Income (loss) before taxes $ 1,098,987 $ ( 242,182) $ 419,411 The Company produces business in the U.S., Bermuda and internationally. The net income deriving from and assets residing in the individual foreign countries in which the Company writes business are not identifiable in the Company’s financial records. Based on gross written premium, the table below presents the largest country, other than the U.S., in which the Company writes business, for the periods indicated: Year Ended December 31, (Dollars in thousands) 2019 2018 2017 United Kingdom gross written premium $ 964,358 $ 914,612 $ 730,826 Approximately 23.1%, 19.7% and 20.4% of the Company’s gross written premiums in 2019, 2018 and 2017, respectively, were sourced through the Company’s largest intermediary.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	18. SUBSEQUENT EVENTS The Company has evaluated known recognized and non-recognized subsequent events. In late 2019 and early 2020, wildfires, flooding and hailstorms have been impacting Australia. In addition, the Coronavirus outbreak is currently affecting many countries around the world. Due to the recentness of these events, the Company is unable to estimate the amount of losses at this time. However, the Company anticipates that the losses from these events will adversely impact first quarter 2020 financial statements.

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data	12 Months Ended
	Dec. 31, 2019
Unaudited Quarterly Financial Data [Abstract]
Unaudited Quarterly Financial Data	19. UNAUDITED QUARTERLY FINANCIAL DATA Summarized quarterly financial data for the periods indicated: 2019 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 2,127,108 $ 2,166,655 $ 2,403,274 $ 2,436,327 Net written premiums 1,851,698 1,783,983 2,068,557 2,120,186 Premiums earned 1,732,697 1,817,299 1,905,619 1,948,071 Net investment income 140,976 179,028 181,058 146,077 Net realized capital gains (losses) 92,232 30,272 ( 12,943) 75,443 Total claims and underwriting expenses 1,537,009 1,620,413 1,933,158 1,976,943 Net income (loss) 354,551 332,868 104,398 217,644 Earnings per common share attributable to Everest Re Group: Basic $ 8.70 $ 8.17 $ 2.56 $ 5.34 Diluted $ 8.67 $ 8.15 $ 2.56 $ 5.32 2018 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,931,607 $ 2,066,521 $ 2,198,664 $ 2,278,361 Net written premiums 1,672,206 1,746,378 1,938,773 2,057,071 Premiums earned 1,619,427 1,729,818 1,731,479 1,850,975 Net investment income 138,294 141,322 161,363 140,204 Net realized capital gains (losses) ( 24,901) 15,776 54,804 ( 172,815) Total claims and underwriting expenses 1,511,100 1,817,815 1,731,201 2,481,858 Net income (loss) 215,186 60,787 198,381 ( 385,313) Earnings per common share attributable to Everest Re Group: Basic $ 5.26 $ 1.49 $ 4.87 $ ( 9.58) Diluted $ 5.23 $ 1.48 $ 4.84 $ ( 9.58)

Revisions To Financial Statemen

Revisions To Financial Statements	12 Months Ended
	Dec. 31, 2019
Revisions To Financial Statements [Abstract]
Revisions To Financial Statements	20. REVISIONS TO FINANCIAL STATEMENTS In preparing its current period financial statements, the Company identified errors in the handling of foreign exchange related to premium funds held from reinsureds. Although management determined that the impact of the foreign exchange differences were not material to prior period financial statements, the impact of recording the cumulative difference would have significantly impacted results within the current period. As a result, prior period balances have been revised in the applicable financial statements and corresponding footnotes to correct the foreign exchange adjustments. Management assessed the materiality of this change within prior period financial statements based upon SEC Staff Accounting Bulletin Number 99, Materiality, which is since codified in Accounting Standards Codification ("ASC") 250, Accounting Changes and Error Corrections. The prior period comparative financial statements that are presented herein have been revised. The following tables present line items for prior period financial statements that have been affected by the revision. For these line items, the tables detail the amounts as previously reported, the impact upon those line items due to the revision, and the amounts as currently revised within the financial statements. CONSOLIDATED BALANCE SHEETS December 31, 2018 December 31, 2017 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) ASSETS: Premiums Receivable $ 2,218,283 $ ( 35,100) $ 2,183,183 $ 1,844,881 $ ( 25,106) $ 1,819,775 Funds held by reinsureds 445,040 ( 10,009) 435,031 292,927 ( 4,292) 288,635 Income taxes 592,385 2,102 594,487 299,438 902 300,340 TOTAL ASSETS $ 24,793,999 $ ( 43,007) $ 24,750,992 $ 23,591,792 $ ( 28,496) $ 23,563,296 SHAREHOLDERS' EQUITY: Retained earnings 9,574,440 ( 43,007) 9,531,433 9,685,908 ( 28,496) 9,657,412 Total shareholders' equity 7,903,804 ( 43,007) 7,860,797 8,369,232 ( 28,496) 8,340,736 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 24,793,999 $ ( 43,007) $ 24,750,992 $ 23,591,792 $ ( 28,496) $ 23,563,296 CONSOLIDATED BALANCE SHEETS June 30, 2019 March 31, 2019 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) ASSETS: Premiums Receivable $ 2,389,943 $ ( 38,836) $ 2,351,107 $ 2,392,094 $ ( 29,831) $ 2,362,263 Funds held by reinsureds 498,043 ( 10,768) 487,275 432,736 ( 9,525) 423,211 Income taxes 358,457 2,261 360,718 475,851 2,000 477,851 TOTAL ASSETS $ 26,387,791 $ ( 47,343) $ 26,340,448 $ 25,630,507 $ ( 37,356) $ 25,593,151 SHAREHOLDERS' EQUITY: Retained earnings 10,152,059 ( 47,343) 10,104,716 9,866,203 ( 37,356) 9,828,847 Total stockholder's equity 8,884,160 ( 47,343) 8,836,817 8,426,629 ( 37,356) 8,389,273 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 26,387,791 $ ( 47,343) $ 26,340,448 $ 25,630,507 $ ( 37,356) $ 25,593,151 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Year Ended December 31, 2018 Year Ended December 31, 2017 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 9,060) $ ( 15,711) $ ( 24,771) $ ( 35,442) $ 14,227 $ ( 21,215) Total revenues $ 7,377,206 $ ( 15,711) $ 7,361,495 $ 6,608,071 $ 14,227 $ 6,622,298 INCOME (LOSS) BEFORE TAXES $ ( 226,471) $ ( 15,711) $ ( 242,182) $ 405,184 $ 14,227 $ 419,411 Income tax expense (benefit) ( 330,023) ( 1,200) ( 331,223) ( 63,784) 444 ( 63,340) NET INCOME (LOSS) $ 103,552 $ ( 14,511) $ 89,041 $ 468,968 $ 13,783 $ 482,751 COMPREHENSIVE INCOME (LOSS) $ ( 196,913) $ ( 14,511) $ ( 211,424) $ 526,091 $ 13,783 $ 539,874 EARNINGS PER COMMON SHARE: Basic $ 2.54 $ ( 0.36) $ 2.18 $ 11.43 $ 0.34 $ 11.77 Diluted $ 2.53 $ ( 0.36) $ 2.17 $ 11.36 $ 0.34 $ 11.70 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 7,977) $ ( 10,248) $ ( 18,225) $ ( 17,030) $ ( 4,495) $ ( 21,525) Total revenues $ 2,018,975 $ ( 10,248) $ 2,008,727 $ 3,979,058 $ ( 4,495) $ 3,974,563 INCOME (LOSS) BEFORE TAXES $ 382,593 $ ( 10,248) $ 372,345 $ 791,384 $ ( 4,495) $ 786,889 Income tax expense (benefit) 39,738 ( 261) 39,477 99,629 ( 159) 99,470 NET INCOME (LOSS) $ 342,855 $ ( 9,987) $ 332,868 $ 691,755 $ ( 4,336) $ 687,419 COMPREHENSIVE INCOME (LOSS) $ 514,064 $ ( 9,987) $ 504,077 $ 1,109,410 $ ( 4,336) $ 1,105,074 EARNINGS PER COMMON SHARE: Basic $ 8.42 $ ( 0.25) $ 8.17 $ 16.98 $ ( 0.10) $ 16.88 Diluted $ 8.39 $ ( 0.24) $ 8.15 $ 16.93 $ ( 0.11) $ 16.82 CONSOLIDATED STATEMENTS OF OPERATIONS Three Months Ended March 31, 2,019 AND COMPREHENSIVE INCOME (LOSS): As Previously Impact of Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 9,053) $ 5,753 $ ( 3,300) Total revenues $ 1,960,083 $ 5,753 $ 1,965,836 INCOME (LOSS) BEFORE TAXES $ 408,791 $ 5,753 $ 414,544 Income tax expense (benefit) 59,891 102 59,993 NET INCOME (LOSS) $ 348,900 $ 5,651 $ 354,551 COMPREHENSIVE INCOME (LOSS) $ 595,346 $ 5,651 $ 600,997 EARNINGS PER COMMON SHARE: Basic $ 8.57 $ 0.13 $ 8.70 Diluted $ 8.54 $ 0.13 $ 8.67 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 5,458) $ ( 7,950) $ ( 13,408) $ 9,642 $ ( 12,590) $ ( 2,948) Total revenues $ 1,944,413 $ ( 7,950) $ 1,936,463 $ 5,582,509 $ ( 12,590) $ 5,569,919 INCOME (LOSS) BEFORE TAXES $ 197,421 $ ( 7,950) $ 189,471 $ 475,827 $ ( 12,590) $ 463,237 Income tax expense (benefit) ( 8,192) ( 718) ( 8,910) ( 9,999) ( 1,118) ( 11,117) NET INCOME (LOSS) $ 205,613 $ ( 7,232) $ 198,381 $ 485,826 $ ( 11,472) $ 474,354 COMPREHENSIVE INCOME (LOSS) $ 180,634 $ ( 7,232) $ 173,402 $ 177,601 $ ( 11,472) $ 166,129 EARNINGS PER COMMON SHARE: Basic $ 5.04 $ ( 0.17) $ 4.87 $ 11.89 $ ( 0.28) $ 11.61 Diluted $ 5.02 $ ( 0.18) $ 4.84 $ 11.83 $ ( 0.28) $ 11.55 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ 3,036 $ ( 9,609) $ ( 6,573) $ 15,100 $ ( 4,640) $ 10,460 Total revenues $ 1,892,939 $ ( 9,609) $ 1,883,330 $ 3,638,096 $ ( 4,640) $ 3,633,456 INCOME (LOSS) BEFORE TAXES $ 60,763 $ ( 9,609) $ 51,154 $ 278,406 $ ( 4,640) $ 273,766 Income tax expense (benefit) ( 9,132) ( 501) ( 9,633) ( 1,807) ( 400) ( 2,207) NET INCOME (LOSS) $ 69,895 $ ( 9,108) $ 60,787 $ 280,213 $ ( 4,240) $ 275,973 COMPREHENSIVE INCOME (LOSS) $ ( 33,469) $ ( 9,108) $ ( 42,577) $ ( 3,033) $ ( 4,240) $ ( 7,273) EARNINGS PER COMMON SHARE: Basic $ 1.71 $ ( 0.22) $ 1.49 $ 6.85 $ ( 0.10) $ 6.75 Diluted $ 1.70 $ ( 0.22) $ 1.48 $ 6.81 $ ( 0.10) $ 6.71 CONSOLIDATED STATEMENTS OF OPERATIONS Three Months Ended March 31, 2018 AND COMPREHENSIVE INCOME (LOSS): As Previously Impact of Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ 12,064 $ 4,969 $ 17,033 Total revenues $ 1,745,157 $ 4,969 $ 1,750,126 INCOME (LOSS) BEFORE TAXES $ 217,643 $ 4,969 $ 222,612 Income tax expense (benefit) 7,325 101 7,426 NET INCOME (LOSS) $ 210,318 $ 4,868 $ 215,186 COMPREHENSIVE INCOME (LOSS) $ 30,436 $ 4,868 $ 35,304 EARNINGS PER COMMON SHARE: Basic $ 5.14 $ 0.12 $ 5.26 Diluted $ 5.11 $ 0.12 $ 5.23 CONSOLIDATED STATEMENTS OF Year Ended December 31, 2018 Year Ended December 31, 2017 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,685,908 $ ( 28,496) $ 9,657,412 $ 9,422,932 $ ( 42,279) $ 9,380,653 Net income (loss) 103,552 ( 14,511) 89,041 468,968 13,783 482,751 Balance, end of period 9,574,440 ( 43,007) 9,531,433 9,685,908 ( 28,496) 9,657,412 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 7,903,804 $ ( 43,007) $ 7,860,797 $ 8,369,232 $ ( 28,496) $ 8,340,736 CONSOLIDATED STATEMENTS OF Six Months Ended June 30, 2019 Three Months Ended March 31, 2019 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, January 1 $ 9,574,440 $ ( 43,007) $ 9,531,433 $ 9,574,440 $ ( 43,007) $ 9,531,433 Net income (loss) 348,900 5,651 354,551 348,900 5,651 354,551 Balance, March 31 9,866,203 ( 37,356) 9,828,847 9,866,203 ( 37,356) 9,828,847 Net income (loss) 342,855 ( 9,987) 332,868 Balance, June 30, 10,152,059 ( 47,343) 10,104,716 TOTAL STOCKHOLDER'S EQUITY, June 30 $ 8,884,160 $ ( 47,343) $ 8,836,817 $ 8,426,629 $ ( 37,356) $ 8,389,273 CONSOLIDATED STATEMENTS OF Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,860,842 $ ( 32,736) $ 9,828,106 $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 205,613 ( 7,232) 198,381 485,826 ( 11,472) 474,354 Balance, end of period 10,013,592 ( 39,968) 9,973,624 10,013,592 ( 39,968) 9,973,624 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,329,013 $ ( 39,968) $ 8,289,045 $ 8,329,013 $ ( 39,968) $ 8,289,045 CONSOLIDATED STATEMENTS OF Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,844,187 $ ( 23,628) $ 9,820,559 $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 69,895 ( 9,108) 60,787 280,213 ( 4,240) 275,973 Balance, end of period 9,860,842 ( 32,736) 9,828,106 9,860,842 ( 32,736) 9,828,106 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,241,349 $ ( 32,736) $ 8,208,613 $ 8,241,349 $ ( 32,736) $ 8,208,613 CONSOLIDATED STATEMENTS OF Three Months Ended March 31, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 210,318 4,868 215,186 Balance, end of period 9,844,187 ( 23,628) 9,820,559 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,344,180 $ ( 23,628) $ 8,320,552 CONSOLIDATED STATEMENTS OF CASH FLOWS Year Ended December 31, 2018 Year Ended December 31, 2017 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 103,552 $ ( 14,511) $ 89,041 $ 468,968 $ 13,783 $ 482,751 Decrease (increase) in premiums receivable ( 392,981) 9,994 ( 382,987) ( 338,335) ( 12,111) ( 350,446) Decrease (increase) in funds held by reinsureds, net ( 159,344) 5,717 ( 153,627) ( 31,104) ( 2,116) ( 33,220) Decrease (increase) in income taxes ( 263,865) ( 1,200) ( 265,065) ( 114,521) 444 ( 114,077) CONSOLIDATED STATEMENTS OF CASH FLOWS Six Months Ended June 30, 2019 Three Months Ended March 31, 2019 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 691,755 $ ( 4,336) $ 687,419 $ 348,900 $ 5,651 $ 354,551 Decrease (increase) in premiums receivable ( 178,319) 3,736 ( 174,583) ( 163,108) ( 5,269) ( 168,377) Decrease (increase) in funds held by reinsureds, net ( 56,180) 759 ( 55,421) 9,837 ( 484) 9,353 Decrease (increase) in income taxes 180,285 ( 159) 180,126 91,754 102 91,856 CONSOLIDATED STATEMENTS OF CASH FLOWS Nine Months Ended September 30, 2018 Six Months Ended June 30, 2018 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 485,826 $ ( 11,472) $ 474,354 $ 280,213 $ ( 4,240) $ 275,973 Decrease (increase) in premiums receivable ( 264,556) 7,265 ( 257,291) ( 126,355) 2,733 ( 123,622) Decrease (increase) in funds held by reinsureds, net ( 78,514) 5,325 ( 73,189) ( 77,794) 1,907 ( 75,887) Decrease (increase) in income taxes 59,034 ( 1,118) 57,916 43,516 ( 400) 43,116 CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2018 As Previously Impact of Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 210,318 $ 4,868 $ 215,186 Decrease (increase) in premiums receivable ( 56,826) ( 4,489) ( 61,315) Decrease (increase) in funds held by reinsureds, net 95,416 ( 480) 94,936 Decrease (increase) in income taxes 55,905 101 56,006

Schedule I - Summary Of Investm

Schedule I - Summary Of Investments - Other Than Investments In Related Parties	12 Months Ended
	Dec. 31, 2019
Schedule I - Summary Of Investments - Other Than Investments In Related Parties [Abstract]
Schedule I - Summary Of Investments - Other Than Investments In Related Parties	SCHEDULE I — SUMMARY OF INVESTMENTS — OTHER THAN INVESTMENTS IN RELATED PARTIES December 31, 2019 Column A Column B Column C Column D Amount Shown in Market Balance (Dollars in thousands) Cost Value Sheet Fixed maturities-available for sale Bonds: U.S. government and government agencies $ 1,489,660 $ 1,515,803 $ 1,515,803 State, municipalities and political subdivisions 507,353 536,915 536,915 Foreign government securities 1,492,315 1,505,950 1,505,950 Foreign corporate securities 2,870,737 2,945,156 2,945,156 Public utilities 322,525 332,818 332,818 All other corporate bonds 6,789,362 6,931,485 6,931,485 Mortgage - backed securities: Commercial 814,570 844,557 844,557 Agency residential 2,173,099 2,198,581 2,198,581 Non-agency residential 5,723 5,703 5,703 Redeemable preferred stock 8,147 7,976 7,976 Total fixed maturities-available for sale 16,473,491 16,824,944 16,824,944 Fixed maturities - available for sale at fair value (1) 3,966 5,826 5,826 Equity securities - at fair value (1) 814,548 931,457 931,457 Short-term investments 414,639 414,706 414,706 Other invested assets 1,763,531 1,763,531 1,763,531 Cash 808,036 808,036 808,036 Total investments and cash $ 20,278,211 $ 20,748,500 $ 20,748,500 (1) Original cost does not reflect fair value adjustments, which have been realized through the statements of operations and comprehensive income (loss).

Schedule II - Condensed Financi

Schedule II - Condensed Financial Information Of The Registrant	12 Months Ended
	Dec. 31, 2019
Schedule II - Condensed Financial Information Of The Registrant [Abstract]
Schedule II - Condensed Financial Information Of The Registrant	SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT CONDENSED BALANCE SHEETS December 31, (Dollars and share amounts in thousands, except par value per share) 2019 2018 ASSETS: Fixed maturities - available for sale, at market value $ 201,666 $ 76,170 (amortized cost: 2019, $ 201,581; 2018, $ 76,274) Other invested assets (cost: 2019, $ 41,700; 2018, $ 91) 41,700 91 Cash 3,471 198 Investment in subsidiaries, at equity in the underlying net assets 9,134,038 7,733,933 Accrued investment income 652 277 Receivable from subsidiaries 9,361 6,726 Other assets 44,646 44,737 TOTAL ASSETS $ 9,435,534 $ 7,862,132 LIABILITIES: Long term note payable, affiliated due 12/1/2028 $ 300,000 $ - Due to subsidiaries 1,491 1,065 Other liabilities 1,118 270 Total liabilities 302,609 1,335 SHAREHOLDERS' EQUITY: Preferred shares, par value: $ 0.01 ; 50,000 shares authorized; no shares issued and outstanding - - Common shares, par value: $ 0.01 ; 200,000 shares authorized (2019) 69,464and (2018) 69,202 issued outstanding before treasury shares 694 692 Additional paid-in capital 2,219,660 2,188,777 Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $ 30,996 at 2019 and $( 20,697) at 2018 28,152 ( 462,557) Treasury shares, at cost; 28,665 shares (2019) and 28,551 shares (2018) ( 3,422,152) ( 3,397,548) Retained earnings 10,306,571 9,531,433 Total shareholders' equity 9,132,925 7,860,797 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 9,435,534 $ 7,862,132 See notes to consolidated financial statements. SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT CONDENSED STATEMENTS OF OPERATIONS Years Ended December 31, 2019 2018 2017 (Dollars in thousands) REVENUES: Net investment income $ 3,484 $ 3,790 $ 1,344 Net realized capital gains (losses) ( 66) ( 57) 80 Other income (expense) 458 ( 5,299) ( 6,872) Net income (loss) of subsidiaries 1,026,233 112,859 509,279 Total revenues 1,030,109 111,293 503,831 EXPENSES: Interest expense - affiliated 2,087 4,085 4,300 Other expenses 18,561 18,167 16,780 Total expenses 20,648 22,252 21,080 INCOME (LOSS) BEFORE TAXES 1,009,461 89,041 482,751 NET INCOME (LOSS) $ 1,009,461 $ 89,041 $ 482,751 Other comprehensive income (loss), net of tax: Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period 496,430 ( 255,656) ( 64,348) Reclassification adjustment for realized losses (gains) included in net income (loss) ( 12,613) 27,496 ( 6,950) Total URA(D) on securities arising during the period 483,817 ( 228,160) ( 71,298) Foreign currency translation adjustments 14,030 ( 76,816) 121,917 Benefit plan actuarial net gain (loss) for the period ( 12,591) ( 510) 1,027 Reclassification adjustment for amortization of net (gain) loss included in net income (loss) 5,453 5,021 5,477 Total benefit plan net gain (loss) for the period ( 7,138) 4,511 6,504 Total other comprehensive income (loss), net of tax 490,709 ( 300,465) 57,123 COMPREHENSIVE INCOME (LOSS) $ 1,500,170 $ ( 211,424) $ 539,874 See notes to consolidated financial statements. SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, (Dollars in thousands) 2019 2018 2017 CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 1,009,461 $ 89,041 $ 482,751 Adjustments to reconcile net income to net cash provided by operating activities: Equity in retained (earnings) deficit of subsidiaries ( 1,026,233) ( 112,859) ( 509,279) Dividends received from Bermuda Re 600,000 750,000 400,000 Dividends received from Everest International - 200,000 - Dividends received from Mt. Logan Re - - 25,000 Change in other assets and liabilities, net 564 4,824 6,107 Increase (decrease) in due to/from affiliates ( 2,209) 683 ( 6,470) Amortization of bond premium (accrual of bond discount) ( 9) ( 577) 12 Realized capital losses (gains) 66 57 ( 80) Non-cash compensation expense 2,796 2,740 3,448 Net cash provided by (used in) operating activities 584,436 933,909 401,489 CASH FLOWS FROM INVESTING ACTIVITIES: Additional investment in subsidiaries ( 478,125) ( 542,965) ( 109,815) Proceeds from fixed maturities matured/called - available for sale, at market value 63 93 696 Proceeds from fixed maturities sold - available for sale, at market value 74,841 24,856 90,154 Distribution from other invested assets 644,918 1,026,297 546,414 Cost of fixed maturities acquired - available for sale, at market value ( 200,267) - ( 189,308) Cost of other invested assets acquired ( 686,528) ( 923,828) ( 503,937) Net change in short-term investments - - - Net cash provided by (used in) investing activities ( 645,098) ( 415,547) ( 165,796) CASH FLOWS FROM FINANCING ACTIVITIES: Common shares issued during the period, net 22,861 20,086 22,790 Purchase of treasury shares ( 24,604) ( 75,304) ( 50,000) Dividends paid to shareholders ( 234,322) ( 216,221) ( 207,242) Proceeds from issuance (cost of repayment) of long term note - affiliated 300,000 (250,000) - Net cash provided by (used in) financing activities 63,935 ( 521,439) ( 234,452) EFFECT OF EXCHANGE RATE CHANGES ON CASH - - - Net increase (decrease) in cash 3,273 ( 3,077) 1,241 Cash, beginning of period 198 3,275 2,034 Cash, end of period $ 3,471 $ 198 $ 3,275 See notes to consolidated financial statements. SCHEDULE II – CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT NOTES to conDENSED financial information 1.) The accompanying condensed financial information should be read in conjunction with the consolidated financial statements and related Notes of Everest Re Group, Ltd. and its Subsidiaries. 2.) Everest Re Group, Ltd. entered into a $ 300,000 thousand long term note agreement with Everest Reinsurance Company, an affiliated company, as of December 17, 2019. The note will pay interest annually at a rate of 1.69 % and is scheduled to mature in December, 2028 3.) Everest Re Group, Ltd. has invested funds in the segregated accounts of Mt. Logan Re, Ltd. (“Mt. Logan Re”), an affiliated entity. On the Condensed Balance Sheets, investments in Mt. Logan Re valued at $ 46,390 thousand and $ 45,625 thousand as of December 31, 2019 and 2018, respectively, have been recorded within Other Assets. On the Condensed Statements of Operations, income of $ 765 thousand, expense of $, 4695 thousand and expense of $ 6,352 thousand for the years ended December 31, 2019, 2018 and 2017, respectively, have been recorded in other income (expense).

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2019
Schedule III - Supplementary Insurance Information [Abstract]
Schedule III - Supplementary Insurance Information	SCHEDULE III — SUPPLEMENTARY INSURANCE INFORMATION Column A Column B Column C Column D Column E Column F Column G Column H Column I Column J Reserve Incurred Geographic Area for Losses Loss and Amortization Deferred and Loss Unearned Net Loss of Deferred Other Net Acquisition Adjustment Premium Premiums Investment Adjustment Acquisition Operating Written (Dollars in thousands) Costs Expenses Reserves Earned Income Expenses Costs Expenses Premium As of and the Year Ended December 31, 2019 Domestic $ 358,108 $ 7,823,095 $ 2,014,712 $ 4,383,837 $ 320,923 $ 2,761,871 $ 1,007,282 $ 348,861 $ 4,605,731 International 66,183 2,655,458 344,222 1,475,669 37,297 1,193,816 342,400 41,690 1,551,753 Bermuda 157,572 3,132,760 697,801 1,544,180 288,919 967,211 354,044 50,348 1,666,940 Total $ 581,863 $ 13,611,313 $ 3,056,735 $ 7,403,686 $ 647,139 $ 4,922,898 $ 1,703,726 $ 440,899 $ 7,824,424 As of and the Year Ended December 31, 2018 Domestic $ 334,818 $ 8,154,003 $ 1,695,208 $ 4,167,619 $ 287,002 $ 3,849,982 $ 835,823 $ 288,933 $ 4,350,157 International 54,253 2,209,202 261,611 1,439,882 34,965 992,704 364,010 39,042 1,458,745 Bermuda 122,502 2,755,885 560,793 1,324,198 259,216 808,717 319,197 43,566 1,605,526 Total $ 511,573 $ 13,119,090 $ 2,517,612 $ 6,931,699 $ 581,183 $ 5,651,403 $ 1,519,030 $ 371,541 $ 7,414,428 As of and the Year Ended December 31, 2017 Domestic $ 289,636 7,254,043 $ 1,460,291 $ 3,642,547 $ 259,621 $ 2,727,649 $ 712,568 $ 241,962 $ 3,875,982 International 53,186 2,175,500 253,626 1,202,043 32,407 1,059,640 287,688 38,844 1,229,597 Bermuda 68,765 2,454,778 286,639 1,093,250 250,870 735,292 303,707 38,011 1,139,082 Total $ 411,587 $ 11,884,321 $ 2,000,556 $ 5,937,840 $ 542,898 $ 4,522,581 $ 1,303,963 $ 318,817 $ 6,244,661 (Some amounts may not reconcile due to rounding.)

Schedule IV - Reinsurance

Schedule IV - Reinsurance	12 Months Ended
	Dec. 31, 2019
Schedule IV - Reinsurance [Abstract]
Schedule IV - Reinsurance	SCHEDULE IV — REINSURANCE Column A Column B Column C Column D Column E Column F Ceded to Assumed Gross Other from Other Net Assumed (Dollars in thousands) Amount Companies Companies Amount to Net December 31, 2019 Total property and liability insurance premiums earned $ 2,556,386 $ 1,207,198 $ 6,054,498 $ 7,403,686 $ 81.8% December 31, 2018 Total property and liability insurance premiums earned $ 2,129,320 $ 1,004,953 $ 5,807,332 $ 6,931,699 $ 83.8% December 31, 2017 Total property and liability insurance premiums earned $ 1,825,705 $ 833,387 $ 4,945,522 $ 5,937,840 $ 83.3%

Summary Of Significant Accoun_2

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Business And Basis Of Presentation	A. Business and Basis of Presentation. Everest Re Group, Ltd. (“Group”), a Bermuda company, through its subsidiaries, principally provides reinsurance and insurance in the U.S., Bermuda and international markets. As used in this document, “Company” means Group and its subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). The statements include all of the following domestic and foreign direct and indirect subsidiaries of Group: Everest International Reinsurance, Ltd. (“Everest International”), Mt. Logan Insurance Managers, Ltd., Mt. Logan Management, Ltd., Everest International Holdings (Bermuda), Ltd. (“International Holdings”), Everest Corporate Member Limited, Everest Service Company (UK), Ltd., Everest Preferred International Holdings, Ltd. (“Preferred International”), Everest Reinsurance (Bermuda), Ltd. (“Bermuda Re”), Everest Re Advisors, Ltd., Everest Advisors (UK), Ltd., Everest Underwriting Group (Ireland), Limited (“Holdings Ireland”), Everest Global Services, Inc. (“Global Services”), Everest Insurance Company of Canada (“Everest Canada”), Premiere Insurance Underwriting Services (“Premiere”), Everest Dublin Insurance Holdings Limited (Ireland) (“Everest Dublin Holdings”), Everest Insurance (Ireland), designated activity company (“Ireland Insurance”), Everest Reinsurance Company (Ireland), designated activity company (“Ireland Re”), Everest Reinsurance Holdings, Inc. (“Holdings”), Salus Systems, LLC (“Salus”), Everest International Assurance, Ltd. (Bermuda) (“Everest Assurance”), Specialty Insurance Group, Inc. (“Specialty”), Specialty Insurance Group - Leisure and Entertainment Risk Purchasing Group LLC (“Specialty RPG”), Mt. McKinley Managers, L.L.C., Everest Specialty Underwriters Services, LLC, Everest Reinsurance Company (“Everest Re”), Everest National Insurance Company (“Everest National”), Everest Reinsurance Company Ltda. (Brazil), Mt. Whitney Securities, Inc., Everest Indemnity Insurance Company (“Everest Indemnity”), Everest Denali Insurance Company (“Everest Denali”), Everest Premier Insurance Company (“Everest Premier”) and Everest Security Insurance Company (“Everest Security”). All amounts are reported in U.S. dollars. The Company consolidates the results of operations and financial position of all voting interest entities ("VOE") in which the Company has a controlling financial interest and all variable interest entities ("VIE") in which the Company is considered to have control and be the primary beneficiary. The consolidation assessment, including the determination as to whether an entity qualifies as a VIE or VOE, depends on the facts and circumstances surrounding each entity. Effective January 1, 2016, the Company adopted Accounting Standards Update (“ASU”) 2015-02, “Consolidation (Topic 810) Amendments to the Consolidation Analysis” issued by the United States Financial Accounting Standards Board (“FASB”), which changed the method in which the Company determines whether entities are consolidated by the Company. The adoption of this amended accounting guidance was implemented utilizing a full retrospective application for prior periods. The amended guidance includes changes in the identification of the primary beneficiary of companies considered to be VIEs. These changes resulted in the Company concluding that Mt. Logan Re, Ltd. (Bermuda) (“Mt. Logan Re”) is a VIE given it has insufficient equity at risk and that each underlying separate segregated account is likewise a VIE. The Company has concluded that it is the primary beneficiary of Mt. Logan Re, but not of the underlying separate segregated accounts and therefore has deconsolidated these segregated accounts. This change had no impact to the net income or retained earnings of the Company. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Ultimate actual results could differ, possibly materially, from those estimates. All intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior years’ amounts to conform to the 2019 presentation.
Investments	B. Investments. Fixed maturity investments available for sale, at market value, reflect unrealized appreciation and depreciation, as a result of temporary changes in market value during the period, in shareholders’ equity, net of income taxes in “accumulated other comprehensive income (loss)” in the consolidated balance sheets. Fixed maturity and equity securities carried at fair value reflect fair value re-measurements as net realized capital gains and losses in the consolidated statements of operations and comprehensive income (loss). The Company records changes in fair value for its fixed maturities available for sale, at market value through shareholders’ equity, net of taxes in accumulated other comprehensive income (loss) since cash flows from these investments will be primarily used to settle its reserve for losses and loss adjustment expense liabilities. The Company anticipates holding these investments for an extended period as the cash flow from interest and maturities will fund the projected payout of these liabilities. As of January 1, 2018, the Company carries all of its equity securities at fair value. For equity securities, at fair value, the Company reflects changes in value as net realized capital gains and losses since these securities may be sold in the near term depending on financial market conditions. Interest income on all fixed maturities and dividend income on all equity securities are included as part of net investment income in the consolidated statements of operations and comprehensive income (loss). Unrealized losses on fixed maturities, which are deemed other-than-temporary and related to the credit quality of a security, are charged to net income (loss) as net realized capital losses. Short-term investments are stated at cost, which approximates market value. Realized gains or losses on sales of investments are determined on the basis of identified cost. For some non-publicly traded securities, market prices are determined through the use of pricing models that evaluate securities relative to the U.S. Treasury yield curve, taking into account the issue type, credit quality, and cash flow characteristics of each security. For other non-publicly traded securities, investment managers’ valuation committees will estimate fair value and in many instances, these fair values are supported with opinions from qualified independent third parties. All fair value estimates from investment managers are reviewed by the Company for reasonableness. For publicly traded securities, market value is based on quoted market prices or valuation models that use observable market inputs. When a sector of the financial markets is inactive or illiquid, the Company may use its own assumptions about future cash flows and risk-adjusted discount rates to determine fair value. Retrospective adjustments are employed to recalculate the values of asset-backed securities. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used to effect the calculation of projected and prepayments for pass-through security types. Other invested assets include limited partnerships, rabbi trusts and prior to July 1, 2018, a private placement liquidity sweep facility. Cash contributions to and cash distributions from the sweep facility were reported gross in cash flows from investing activities in the consolidated statements of cash flows. Limited partnerships are accounted for under the equity method of accounting, which can be recorded on a monthly or quarterly lag.
Uncollectible Receivable Balances	C. Uncollectible Receivable Balances. The Company provides reserves for uncollectible reinsurance recoverable and premium receivable balances based on management’s assessment of the collectability of the outstanding balances. Such reserves are presented in the table below for the periods indicated. Years Ended December 31, (Dollars in thousands) 2019 2018 Reinsurance receivables and premium receivables $ 25,605 25,611
Deferred Acquisition Costs	D. Deferred Acquisition Costs. Acquisition costs, consisting principally of commissions and brokerage expenses and certain premium taxes and fees incurred at the time a contract or policy is issued and that vary with and are directly related to the Company’s reinsurance and insurance business, are deferred and amortized over the period in which the related premiums are earned. Deferred acquisition costs are limited to their estimated realizable value by line of business based on the related unearned premiums, anticipated claims and claim expenses and anticipated investment income. Deferred acquisition costs amortized to income are presented in the table below for the periods indicated. Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Deferred acquisition costs $ 1,703,726 $ 1,519,030 $ 1,303,963
Reserve For Losses And Loss Adjustment Expenses	E. Reserve for Losses and Loss Adjustment Expenses. The reserve for losses and loss adjustment expenses (“LAE”) is based on individual case estimates and reports received from ceding companies. A provision is included for losses and LAE incurred but not reported (“IBNR”) based on past experience. A provision is also included for certain potential liabilities relating to asbestos and environmental (“A&E”) exposures, for which liabilities cannot be estimated using traditional reserving techniques. See also Note 3. The reserves are reviewed periodically and any changes in estimates are reflected in earnings in the period the adjustment is made. The Company’s loss and LAE reserves represent management’s best estimate of the ultimate liability. Loss and LAE reserves are presented gross of reinsurance receivables and incurred losses and LAE are presented net of reinsurance. Accruals for commissions are established for reinsurance contracts that provide for the stated commission percentage to increase or decrease based on the loss experience of the contract. Changes in estimates for such arrangements are recorded as commission expense. Commission accruals for contracts with adjustable features are estimated based on expected loss and LAE.
Future Policy Benefit Reserve	F. Future Policy Benefit Reserve. Liabilities for future policy benefits on annuity policies are carried at their accumulated values. Reserves for policy benefits include mortality claims in the process of settlement and IBNR claims. Actual experience in a particular period may fluctuate from expected results.
Premium Revenues	G. Premium Revenues. Written premiums are earned ratably over the periods of the related insurance and reinsurance contracts. Unearned premium reserves are established relative to the unexpired contract period. For reinsurance contracts, such reserves are established based upon reports received from ceding companies or estimated using pro rata methods based on statistical data. Reinstatement premiums represent additional premium received on reinsurance coverages, most prevalently catastrophe related, when limits have been depleted under the original reinsurance contract and additional coverage is granted. Written and earned premiums and the related costs, which have not yet been reported to the Company, are estimated and accrued. Premiums are net of ceded reinsurance.
Prepaid Reinsurance Premiums	H. Prepaid Reinsurance Premiums. Prepaid reinsurance premiums represent unearned premium reserves ceded to other reinsurers. Prepaid reinsurance premiums for any foreign reinsurers comprising more than 10% of the outstanding balance at December 31, 2019 were secured either through collateralized trust arrangements, rights of offset or letters of credit, thereby limiting the credit risk to the Company.
Income Taxes	I. Income Taxes. Holdings and its wholly-owned subsidiaries file a consolidated U.S. federal income tax return. Foreign subsidiaries and branches of subsidiaries file local tax returns as required. Group and subsidiaries not included in Holdings’ consolidated tax return file separate company U.S. federal income tax returns as required. Deferred income taxes have been recorded to recognize the tax effect of temporary differences between the financial reporting and income tax bases of assets and liabilities, which arise because of differences between GAAP and income tax accounting rules.
Foreign Currency	J. Foreign Currency. As a global entity, the Company transacts business in numerous currencies through business units located around the world. The base transactional currency for each business unit is determined by the local currency used for most economic activity in that area. Movements in exchange rates related to assets and liabilities at the business units between the original currency and the base currency are recorded through the consolidated statements of operations and comprehensive income (loss) in other income (expense), except for currency movements related to available for sale investments, which are excluded from net income (loss) and accumulated in shareholders’ equity, net of deferred taxes. The business units’ base currency financial statements are translated to U.S. dollars using the exchange rates at the end of period for the balance sheets and the average exchange rates in effect for the reporting period for the income statements. Gains and losses resulting from translating the foreign currency financial statements, net of deferred income taxes, are excluded from net income loss and accumulated in shareholders’ equity.
Earnings Per Common Share	K. Earnings Per Common Share. Basic earnings per share are calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if options granted under various share-based compensation plans were exercised resulting in the issuance of common shares that would participate in the earnings of the entity. Net income (loss) per common share has been computed as per below, based upon weighted average common basic and dilutive shares outstanding. Years Ended December 31, (Dollars in thousands, except per share amounts) 2019 2018 2017 Net income (loss) per share: Numerator Net income (loss) $ 1,009,461 $ 89,041 $ 482,751 Less: dividends declared-common shares and nonvested common shares ( 234,322) ( 216,221) ( 207,242) Undistributed earnings 775,139 ( 127,180) 275,508 Percentage allocated to common shareholders (1) 98.9 % 99.0 % 98.9 % 766,386 ( 125,848) 272,589 Add: dividends declared-common shareholders 231,796 214,088 205,182 Numerator for basic and diluted earnings per common share $ 998,182 $ 88,239 $ 477,771 Denominator Denominator for basic earnings per weighted-average common shares 40,291 40,388 40,595 Effect of dilutive securities: Options 129 198 248 Denominator for diluted earnings per adjusted weighted-average common shares 40,420 40,586 40,843 Per common share net income (loss) Basic $ 24.77 $ 2.18 $ 11.77 Diluted $ 24.70 $ 2.17 $ 11.70 (1) Basic weighted-average common shares outstanding 40,291 40,388 40,595 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,751 40,816 41,030 Percentage allocated to common shareholders 98.9 % 99.0 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no anti-diluted options outstanding for the years ended December 31, 2019, 2018 and 2017. All outstanding options expire on or between February 24, 2020 and September 19, 2022.
Segmentation	L. Segmentation. The Company, through its subsidiaries, operates in four segments: U.S. Reinsurance, International, Bermuda and Insurance. See also Note 17.
Derivatives	M. Derivatives. The Company sold seven equity index put option contracts, based on two indices, in 2001 and 2005. The Company sold these equity index put options as insurance products with the intent of achieving a profit. These equity index put option contracts meet the definition of a derivative under FASB guidance and the Company’s position in these equity index put option contracts is unhedged. Accordingly, these equity index put option contracts are carried at fair value in the consolidated balance sheets with changes in fair value recorded in the consolidated statements of operations and comprehensive income (loss). As of December 31, 2019, four of these contracts had already expired, with no liability due under the terms of the contract. The fair value of the equity index put options can be found in the Company’s consolidated balance sheets as follows: (Dollars in thousands) Derivatives not designated as Location of fair value At December 31, hedging instruments in balance sheets 2019 2018 Equity index put option contracts Equity index put option liability $ 5,584 $ 11,958 Total $ 5,584 $ 11,958 The change in fair value of the equity index put option contracts can be found in the Company’s statement of operations and comprehensive income (loss) as follows: (Dollars in thousands) Location of gain (loss) in statements of operations and comprehensive income (loss) For the Years Ended December 31, Derivatives not designated as hedging instruments 2019 2018 2017 Equity index put option contracts Net derivative gain (loss) $ 6,374 $ 520 $ 9,581 Total $ 6,374 $ 520 $ 9,581
Deposit Assets And Liabilities	N. Deposit Assets and Liabilities. In the normal course of its operations, the Company may enter into contracts that do not meet risk transfer provisions. Such contracts are accounted for using the deposit accounting method and are included in other liabilities in the Company’s consolidated balance sheets. For such contracts, the Company originally records deposit liabilities for an amount equivalent to the assets received. Actuarial studies are used to estimate the final liabilities under such contracts with any change reflected in the consolidated statements of operations and comprehensive income (loss).
Share-Based Compensation	O. Share-Based Compensation. Share-based compensation stock option, restricted share and performance share unit awards are fair valued at the grant date and expensed over the vesting period of the award. The tax benefit on the recorded expense is deferred until the time the award is exercised or vests (becomes unrestricted). See Note 16.
Application Of Recently Issued Accounting Guidance	P. Application of Recently Issued Accounting Guidance. Accounting for Income Taxes . In December 2019, The Financial Accounting Standards Board (“FASB”) issued ASU 2019-12, which provides simplification of existing guidance for income taxes, including the removal of certain exceptions related to recognition of deferred tax liabilities on foreign subsidiaries. The guidance is effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. The Company is currently evaluating the impact of the adoption of ASU 2019-12 on its financial statements. Simplification of Disclosure Requirements. In August 2018, the Securities and Exchange Commission (“SEC”) issued Final Rule Release #33-10532 (“the Rule”) which addresses the simplification of the SEC’s disclosure requirements for quarterly and annual financial reports. The main changes addressed by the Rule that are applicable to the Company are 1) elimination of the requirement to disclose dividend per share information on the face of the Statements of Operations and Comprehensive Income (Loss) and 2) a new requirement to disclose changes in equity by line item with subtotals for each interim reporting period on the Statements of Changes in Shareholders’ Equity. The Rule became effective for all financial reports filed after November 5, 2018 (30 days after its publication in the Federal Register), except for the additional requirement for the Statements of Changes in Shareholders’ Equity which was to be implemented for first quarter 2019 reporting. The Company has adopted the portions of the Rule that became effective November 5, 2018. The portion of the Rule related to the new requirement for the Statements of Changes in Shareholders’ Equity was adopted by the Company in the first quarter of 2019. Accounting for Cloud Computing Arrangement. In August 2018, FASB issued ASU 2018-15, which outlines accounting for implementation costs of a cloud computing arrangement that is a service contract. This guidance requires that implementation costs of a cloud computing arrangement that is a service contract must be capitalized and expensed in accordance with the existing provisions provided in Subtopic 350-40 regarding development of internal use software. In addition, any capitalized implementation costs should be amortized over the term of the hosting arrangement. The guidance is effective for annual reporting periods beginning after December 15, 2019 and interim periods within that annual reporting period. The Company does not expect the adoption of ASU 2018-15 to have a material impact on its financial statements. Accounting for Long Duration Contracts. In August 2018, FASB issued ASU 2018-12, which discusses changes to the recognition, measurement and presentation of long duration contracts. The main provisions of this guidance address the following: 1) In determining liability for future policy benefits, companies must review cash flow assumptions at least annually and the discount rate assumption at each reporting period date 2) Amortization of deferred acquisition costs has been simplified to be in constant level proportion to either premiums, gross profits or gross margins 3) Disaggregated roll forwards of beginning and ending liabilities for future policy benefits are required. The guidance was originally effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. However, FASB issued ASU 2019-09 in November 2019 which defers the effective date of ASU 2018-12 until annual reporting periods beginning after December 15, 2021. The Company is currently evaluating the impact of the adoption of ASU 2018-12 on its financial statements. Accounting for Deferred Taxes in Accumulated Other Comprehensive Income (AOCI). In February 2018, FASB issued ASU 2018-02 which outlines guidance on the treatment of trapped deferred taxes contained within AOCI on the consolidated balance sheets. The new guidance allows the amount of trapped deferred taxes in AOCI, resulting from the change in the U.S. tax rate from 35% to 21% upon enactment of the Tax Cuts and Jobs Act (“TCJA”), to be reclassified as part of retained earnings in the consolidated balance sheets. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018, but early adoption is allowed. The Company decided to early adopt the guidance as of December 31, 2017. The adoption resulted in a reclass of $ 1,250 thousand between AOCI and retained earnings during the fourth quarter of 2017. As an accounting policy, the Company has adopted the aggregate portfolio approach for releasing disproportionate income tax effects from AOCI. Accounting for Impact on Income Taxes due to Tax Reform. In December 2017, the SEC issued Staff Accounting Bulletin (“SAB”) 118 which provides guidance on the application of FASB Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, due to the enactment of TCJA. SAB 118 became effective upon release. The Company has adopted the provisions of SAB 118 with respect to measuring the tax effects for the modifications to the determination of tax basis loss reserves. In 2018, the Company recorded adjustments to the amount of tax expense it recorded in 2017 with respect to the TCJA as estimated amounts were finalized, which did not have a material impact on the Company’s financial statements. Amortization of Bond Premium. In March 2017, FASB issued ASU 2017-08 which outlines guidance on the amortization period for premium on callable debt securities. The new guidance requires that the premium on callable debt securities be amortized through the earliest call date rather than through the maturity date of the callable security. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018. The adoption of ASU 2017-08 did not have a material impact on the Company’s financial statements. Presentation and Disclosure of Net Periodic Benefit Costs. In March 2017, FASB issued ASU 2017-07 which outlines guidance on the presentation of net periodic costs of benefit plans. The new guidance requires that the service cost component of net periodic benefit costs be reported within the same line item of the statements of operations as other compensation costs are reported. Other components of net periodic benefit costs should be reported separately. Footnote disclosure is required to state within which line items of the statements of operations the components are reported. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2017-07 did not have a material impact on the Company’s financial statements. Disclosure of Restricted Cash. In November 2016, FASB issued ASU 2016-18 and in August 2016, FASB issued ASU 2016-15 which outline guidance on the presentation in the statements of cash flows of changes in restricted cash. The new guidance requires that the statements of cash flows should reflect all changes in cash, cash equivalents and restricted cash in total and not segregated individually. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-18 and ASU 2016-15 did not have a material impact on the Company’s financial statements. Intra-Entity Asset Transfers. In October 2016, FASB issued ASU 2016-16 which outlines guidance on the tax accounting for intra-entity asset sales and transfers, other than inventory. The new guidance requires that reporting entities recognize tax expense from the intra-entity transfer of an asset in the seller’s tax jurisdiction at the time of transfer and recognize any deferred tax asset in the buyer’s tax jurisdiction at the time of transfer. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-16 did not have a material impact on the Company’s financial statements. Valuation of Financial Instruments. In June 2016, FASB issued ASU 2016-13 (and has subsequently issued related guidance and amendments in ASU 2019-11 and ASU 2019-10 in November 2019) which outline guidance on the valuation of and accounting for assets measured at amortized cost and available for sale debt securities. The carrying value of assets measured at amortized cost will now be presented as the amount expected to be collected on the financial asset (amortized cost less an allowance for credit losses valuation account). Available for sale debt securities will now record credit losses through an allowance for credit losses, which will be limited to the amount by which fair value is below amortized cost. The guidance is effective for annual and interim reporting periods beginning after December 15, 2019. The Company does not expect the adoption of ASU 2016-13, 2019-11 and 2019-10 to have a material impact on its financial statements. Accounting for Share-Based Compensation. In March 2016, the FASB issued ASU 2016-09, authoritative guidance regarding the accounting for share-based compensation. This guidance requires that the income tax effects resulting from the change in the value of share-based compensation awards between grant and settlement will be recorded as part of the consolidated statements of operations and comprehensive income/(loss). Previously, excess tax benefits have been recorded as part of the additional paid in capital within the consolidated balance sheets. The guidance is effective for annual reporting periods beginning after December 15, 2016 and interim periods within that annual reporting period. The Company has implemented this guidance prospectively as of January 1, 2017. The guidance also requires that the cost of employee taxes paid via shares withheld upon settlement of share-based compensation awards must be shown as a financing activity within the Statements of Cash Flows. The Company has implemented this guidance retrospectively as of January 1, 2017. Leases . In February 2016, FASB issued ASU 2016-02 (and subsequently issued ASU 2018-11 in July, 2018) which outline new guidance on the accounting for leases. The new guidance requires the recognition of lease assets and lease liabilities on the balance sheets for most leases that were previously deemed operating leases and required only lease expense presentation in the statements of operations. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018. The Company adopted ASU 2016-02 effective January 1, 2019 and elected to utilize a cumulative-effect adjustment to the opening balance of retained earnings for the year of adoption. Accordingly, the Company’s reporting for the comparative periods prior to adoption continue to be presented in the financial statements in accordance with previous lease accounting guidance. The Company also elected to apply the package of practical expedients applicable to the Company in the updated guidance for transition for leases in effect at adoption. The Company did not elect the hindsight practical expedient to determine the lease term of existing leases (e.g. The Company did not re-assess lease renewals, termination options nor purchase options in determining lease terms). The adoption of the updated guidance resulted in the Company recognizing a right-of-use asset of $ 69,869 77,270 zero. The adoption of the updated guidance did not have a material effect on the Company’s results of operations or liquidity. Recognition and Measurement of Financial Instruments. In January 2016, the FASB issued ASU 2016-01 which outlines revised guidance on the accounting for equity investments. The new guidance states that all equity investments in unconsolidated entities will be measured at fair value, with the change in value being recorded through the income statement rather than being recorded within other comprehensive income. The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-01 resulted in a cumulative change adjustment of $ 1,201 thousand between AOCI and retained earnings, which is disclosed separately within the consolidated statement of changes in shareholders’ equity. Revenue Recognition. In May 2014, the FASB issued ASU 2014-09 and in August 2015, FASB issued ASU 2015-14 which outline revised guidance on the recognition of revenue arising from contracts with customers. The new guidance states that reporting entities should apply certain steps to determine when revenue should be recognized, based upon fulfillment of performance obligations to complete contracts. The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2014-09 and ASU 2015-14 did not have a material impact on the Company’s financial statements. Any issued guidance and pronouncements, other than those directly referenced above, are deemed by the Company to be either not applicable or immaterial to its financial statements.

Summary Of Significant Accoun_3

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract]
Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables	Years Ended December 31, (Dollars in thousands) 2019 2018 Reinsurance receivables and premium receivables $ 25,605 25,611
Schedule Of Deferred Acquisition Costs Amortized To Income	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Deferred acquisition costs $ 1,703,726 $ 1,519,030 $ 1,303,963
Net Income (Loss) Per Common Share	Years Ended December 31, (Dollars in thousands, except per share amounts) 2019 2018 2017 Net income (loss) per share: Numerator Net income (loss) $ 1,009,461 $ 89,041 $ 482,751 Less: dividends declared-common shares and nonvested common shares ( 234,322) ( 216,221) ( 207,242) Undistributed earnings 775,139 ( 127,180) 275,508 Percentage allocated to common shareholders (1) 98.9 % 99.0 % 98.9 % 766,386 ( 125,848) 272,589 Add: dividends declared-common shareholders 231,796 214,088 205,182 Numerator for basic and diluted earnings per common share $ 998,182 $ 88,239 $ 477,771 Denominator Denominator for basic earnings per weighted-average common shares 40,291 40,388 40,595 Effect of dilutive securities: Options 129 198 248 Denominator for diluted earnings per adjusted weighted-average common shares 40,420 40,586 40,843 Per common share net income (loss) Basic $ 24.77 $ 2.18 $ 11.77 Diluted $ 24.70 $ 2.17 $ 11.70 (1) Basic weighted-average common shares outstanding 40,291 40,388 40,595 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,751 40,816 41,030 Percentage allocated to common shareholders 98.9 % 99.0 % 98.9 % (Some amounts may not reconcile due to rounding.)
Fair Value Of The Equity Index Put Options	(Dollars in thousands) Derivatives not designated as Location of fair value At December 31, hedging instruments in balance sheets 2019 2018 Equity index put option contracts Equity index put option liability $ 5,584 $ 11,958 Total $ 5,584 $ 11,958
Change In Fair Value Of The Equity Index Put Option Contracts	(Dollars in thousands) Location of gain (loss) in statements of operations and comprehensive income (loss) For the Years Ended December 31, Derivatives not designated as hedging instruments 2019 2018 2017 Equity index put option contracts Net derivative gain (loss) $ 6,374 $ 520 $ 9,581 Total $ 6,374 $ 520 $ 9,581

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At December 31, 2019 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,489,660 $ 28,357 $ ( 2,214) $ 1,515,803 $ - Obligations of U.S. states and political subdivisions 507,353 29,651 ( 89) 536,915 - Corporate securities 6,227,661 185,052 ( 37,767) 6,374,946 469 Asset-backed securities 892,373 6,818 ( 1,858) 897,333 - Mortgage-backed securities Commercial 814,570 31,236 ( 1,249) 844,557 - Agency residential 2,173,099 36,361 ( 10,879) 2,198,581 - Non-agency residential 5,723 - ( 20) 5,703 - Foreign government securities 1,492,315 47,148 ( 33,513) 1,505,950 71 Foreign corporate securities 2,870,737 107,999 ( 33,580) 2,945,156 447 Total fixed maturity securities $ 16,473,491 $ 472,622 $ ( 121,169) $ 16,824,944 $ 987 At December 31, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,629,454 $ 16,781 $ ( 15,101) $ 2,631,134 $ - Obligations of U.S. states and political subdivisions 490,018 12,915 ( 2,839) 500,094 439 Corporate securities 5,538,582 48,465 ( 141,515) 5,445,532 1,688 Asset-backed securities 545,427 162 ( 5,492) 540,097 - Mortgage-backed securities Commercial 329,883 2,167 ( 5,340) 326,710 - Agency residential 1,832,760 7,325 ( 43,821) 1,796,264 - Non-agency residential 10,198 37 ( 26) 10,209 - Foreign government securities 1,335,328 34,743 ( 55,906) 1,314,165 98 Foreign corporate securities 2,694,922 63,994 ( 97,858) 2,661,058 320 Total fixed maturity securities $ 15,406,572 $ 186,589 $ ( 367,898) $ 15,225,263 $ 2,545 (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At December 31, 2019 At December 31, 2018 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,456,960 $ 1,457,919 $ 1,328,571 $ 1,330,534 Due after one year through five years 6,757,107 6,869,359 8,114,247 8,016,490 Due after five years through ten years 3,471,370 3,609,816 2,455,911 2,413,846 Due after ten years 902,289 941,676 789,575 791,113 Asset-backed securities 892,373 897,333 545,427 540,097 Mortgage-backed securities: Commercial 814,570 844,557 329,883 326,710 Agency residential 2,173,099 2,198,581 1,832,760 1,796,264 Non-agency residential 5,723 5,703 10,198 10,209 Total fixed maturity securities $ 16,473,491 $ 16,824,944 $ 15,406,572 $ 15,225,263
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Years Ended December 31, (Dollars in thousands) 2019 2018 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 534,410 $ ( 247,497) Fixed maturity securities, other-than-temporary impairment ( 1,559) ( 1,071) Change in unrealized appreciation (depreciation), pre-tax 532,851 ( 248,568) Deferred tax benefit (expense) ( 49,149) 20,543 Deferred tax benefit (expense), other-than-temporary impairment 115 ( 135) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ 483,817 $ ( 228,160)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type	Duration of Unrealized Loss at December 31, 2019 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 85,527 $ ( 1,005) $ 249,371 $ ( 1,209) $ 334,898 $ ( 2,214) Obligations of U.S. states and political subdivisions 4,600 ( 38) 5,522 ( 51) 10,122 ( 89) Corporate securities 547,120 ( 9,877) 395,369 ( 27,890) 942,489 ( 37,767) Asset-backed securities 176,222 ( 1,027) 94,190 ( 831) 270,412 ( 1,858) Mortgage-backed securities Commercial 83,127 ( 689) 23,063 ( 560) 106,190 ( 1,249) Agency residential 344,267 ( 1,834) 488,680 ( 9,045) 832,947 ( 10,879) Non-agency residential 332 - 3,976 ( 20) 4,308 ( 20) Foreign government securities 210,766 ( 4,770) 283,648 ( 28,743) 494,414 ( 33,513) Foreign corporate securities 278,403 ( 7,553) 365,808 ( 26,027) 644,211 ( 33,580) Total fixed maturity securities $ 1,730,364 $ ( 26,793) $ 1,909,627 $ ( 94,376) $ 3,639,991 $ ( 121,169) Duration of Unrealized Loss at December 31, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 76,226 $ ( 158) $ 777,409 $ ( 14,943) $ 853,635 $ ( 15,101) Obligations of U.S. states and political subdivisions 71,559 ( 1,444) 38,105 ( 1,395) 109,664 ( 2,839) Corporate securities 2,513,463 ( 69,619) 1,683,729 ( 71,896) 4,197,192 ( 141,515) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities Commercial 71,167 ( 1,128) 154,201 ( 4,212) 225,368 ( 5,340) Agency residential 156,930 ( 975) 1,373,629 ( 42,846) 1,530,559 ( 43,821) Non-agency residential 10,174 ( 26) - - 10,174 ( 26) Foreign government securities 196,303 ( 9,719) 494,156 ( 46,187) 690,459 ( 55,906) Foreign corporate securities 939,808 ( 35,023) 782,405 ( 62,835) 1,722,213 ( 97,858) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity	Duration of Unrealized Loss at December 31, 2019 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 67,879 $ ( 1,237) $ 416,583 $ ( 23,004) $ 484,462 $ ( 24,241) Due in one year through five years 464,753 ( 7,960) 689,195 ( 38,138) 1,153,948 ( 46,098) Due in five years through ten years 495,741 ( 12,388) 103,612 ( 11,100) 599,353 ( 23,488) Due after ten years 98,043 ( 1,658) 90,328 ( 11,678) 188,371 ( 13,336) Asset-backed securities 176,222 ( 1,027) 94,190 ( 831) 270,412 ( 1,858) Mortgage-backed securities 427,726 ( 2,523) 515,719 ( 9,625) 943,445 ( 12,148) Total fixed maturity securities $ 1,730,364 $ ( 26,793) $ 1,909,627 $ ( 94,376) $ 3,639,991 $ ( 121,169) Duration of Unrealized Loss at December 31, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 454,239 $ ( 2,558) $ 427,513 $ ( 20,675) $ 881,752 $ ( 23,233) Due in one year through five years 2,014,704 ( 45,148) 2,764,981 ( 129,940) 4,779,685 ( 175,088) Due in five years through ten years 1,082,568 ( 51,300) 492,216 ( 34,210) 1,574,784 ( 85,510) Due after ten years 245,848 ( 16,957) 91,094 ( 12,431) 336,942 ( 29,388) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities 238,271 ( 2,129) 1,527,830 ( 47,058) 1,766,101 ( 49,187) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898)
Summary Of Components Of Net Investment Income	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Fixed maturities $ 520,291 $ 465,793 $ 427,379 Equity securities 19,505 25,327 34,523 Short-term investments and cash 17,619 14,395 4,177 Other invested assets Limited partnerships 105,815 93,327 83,569 Other 14,117 16,960 10,125 Gross investment income before adjustments 677,347 615,802 559,773 Funds held interest income (expense) 13,271 6,300 11,874 Future policy benefit reserve income (expense) ( 1,380) ( 1,419) ( 1,282) Gross investment income 689,238 620,683 570,365 Investment expenses ( 42,099) ( 39,500) ( 27,467) Net investment income $ 647,139 $ 581,183 $ 542,898
Summary Of Components Of Net Realized Capital Gains (Losses)	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Fixed maturity securities, market value: Other-than-temporary impairments $ ( 20,899) $ ( 8,110) $ ( 7,093) Gains (losses) from sales 28,025 ( 21,719) 17,714 Fixed maturity securities, fair value: Gains (losses) from sales 355 ( 1,799) - Gains (losses) from fair value adjustments 1,808 1,506 - Equity securities, market value: Gains (losses) from sales - - ( 3,424) Equity securities, fair value: Gains (losses) from sales 4,148 ( 29,941) 6,969 Gains (losses) from fair value adjustments 165,200 ( 68,832) 138,973 Other invested assets 6,003 1,815 61 Short-term investments gain (loss) 364 ( 56) ( 6) Total net realized capital gains (losses) $ 185,004 $ ( 127,136) $ 153,194
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Proceeds from sales of fixed maturity securities $ 3,283,154 $ 3,150,179 $ 2,401,844 Gross gains from sales 63,721 33,996 58,589 Gross losses from sales ( 35,341) ( 57,514) ( 40,875) Proceeds from sales of equity securities $ 283,965 $ 1,199,409 $ 651,433 Gross gains from sales 14,274 31,718 24,809 Gross losses from sales ( 10,126) ( 61,659) ( 21,264)

Reserve For Losses, LAE And F_2

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	12 Months Ended
	Dec. 31, 2019
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross reserves beginning of period $ 13,119,090 $ 11,884,321 10,312,313 Less reinsurance recoverables ( 1,619,641) ( 1,212,649) ( 990,862) Net reserves beginning of period 11,499,449 10,671,672 9,321,451 Incurred related to: Current year 4,986,456 5,264,327 4,815,967 Prior years ( 63,558) 387,076 ( 293,386) Total incurred losses and LAE 4,922,898 5,651,403 4,522,581 Paid related to: Current year 2,042,246 1,700,765 1,280,605 Prior years 2,460,825 3,011,175 2,062,634 Total paid losses and LAE 4,503,071 4,711,940 3,343,239 Foreign exchange/translation adjustment 51,325 ( 111,686) 170,879 Net reserves end of period 11,970,601 11,499,449 10,671,672 Plus reinsurance recoverables 1,640,712 1,619,641 1,212,649 Gross reserves end of period $ 13,611,313 $ 13,119,090 11,884,321 (Some amounts may not reconcile due to rounding.)
Ultimate Loss And ALAE And Paid Loss And ALAE, Net Of Reinsurance	U.S. Reinsurance – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 401,018 $ 395,794 $ 329,084 $ 325,134 $ 321,099 $ 320,958 $ 324,139 $ 312,483 1,539 N/A 2013 310,935 388,323 385,643 388,287 372,409 362,781 355,118 3,851 N/A 2014 367,492 383,657 392,379 375,404 357,608 351,033 2,232 N/A 2015 326,346 354,265 352,983 350,790 337,332 10,184 N/A 2016 330,362 354,822 355,804 343,004 56,353 N/A 2017 346,836 347,147 342,896 105,550 N/A 2018 484,218 472,532 259,800 N/A 2019 767,529 488,182 N/A $ 3,281,926 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 9,986 $ 38,496 $ 82,995 $ 143,510 $ 187,286 $ 218,653 $ 272,046 $ 286,409 2013 14,842 48,929 108,801 170,868 211,273 285,756 310,168 2014 18,809 54,255 110,249 164,552 254,077 294,533 2015 19,902 53,621 107,458 206,397 257,511 2016 18,927 58,310 137,219 193,804 2017 25,800 73,023 142,335 2018 63,140 104,690 2019 103,453 $ 1,692,901 All outstanding liabilities prior to 2012, net of reinsurance 607,385 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,196,410 (Some amounts may not reconcile due to rounding.) U.S. Reinsurance – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 937,720 $ 723,851 $ 723,151 $ 715,961 $ 713,237 $ 706,782 $ 692,079 $ 694,576 1,112 N/A 2013 622,108 405,338 352,687 314,637 310,942 308,557 310,199 1,099 N/A 2014 603,258 516,189 437,409 402,129 396,641 397,683 2,674 N/A 2015 673,913 534,178 476,348 451,694 456,195 5,655 N/A 2016 972,881 816,765 797,339 788,551 10,293 N/A 2017 1,564,165 2,117,747 2,231,384 16,538 N/A 2018 1,728,705 1,572,138 88,063 N/A 2019 970,831 329,576 N/A $ 7,421,556 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 242,315 $ 402,305 $ 520,244 $ 598,289 $ 621,013 $ 646,572 $ 651,550 $ 666,768 2013 234,464 250,850 269,014 289,130 296,074 300,708 302,756 2014 189,598 289,430 338,030 362,825 373,060 375,988 2015 225,655 320,310 378,235 405,614 419,757 2016 291,462 582,985 681,502 735,678 2017 545,551 1,422,328 1,744,822 2018 409,225 1,064,431 2019 568,556 $ 5,878,758 All outstanding liabilities prior to 2012, net of reinsurance 29,929 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,572,727 (Some amounts may not reconcile due to rounding.) International – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 224,614 $ 146,421 $ 135,234 $ 135,230 $ 117,350 $ 118,941 $ 116,283 101,872 6,225 N/A 2013 184,497 168,277 164,973 144,869 141,645 138,355 130,124 13,641 N/A 2014 195,753 187,451 168,865 166,576 166,605 158,117 27,302 N/A 2015 193,714 179,392 172,811 172,061 167,290 30,299 N/A 2016 184,267 180,284 177,979 178,255 46,648 N/A 2017 191,492 139,214 150,276 48,308 N/A 2018 309,673 319,752 148,582 N/A 2019 291,237 189,506 N/A $ 1,496,922 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 18,875 $ 30,090 $ 46,015 $ 56,420 $ 66,234 $ 76,921 $ 83,253 $ 88,278 2013 17,865 41,481 54,619 67,605 75,964 86,851 95,799 2014 25,910 44,805 62,508 73,955 86,607 99,522 2015 24,237 48,806 69,674 82,465 96,180 2016 26,446 50,824 70,108 87,191 2017 26,541 52,774 77,614 2018 57,962 97,222 2019 52,808 $ 694,615 All outstanding liabilities prior to 2012, net of reinsurance 116,104 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 918,411 (Some amounts may not reconcile due to rounding.) International – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 437,946 $ 397,747 $ 338,496 $ 346,116 $ 342,251 $ 340,618 $ 344,626 $ 358,428 754 N/A 2013 473,767 413,959 374,216 366,182 365,106 362,370 369,876 920 N/A 2014 589,489 541,484 497,317 443,210 445,914 446,412 3,613 N/A 2015 545,360 393,027 388,795 384,816 385,980 4,466 N/A 2016 539,447 543,428 593,567 595,512 15,930 N/A 2017 857,100 954,835 970,874 15,997 N/A 2018 544,258 574,521 84,717 N/A 2019 879,698 389,242 N/A $ 4,581,301 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 126,001 $ 230,203 $ 279,611 $ 303,002 $ 311,706 $ 319,112 $ 324,936 $ 355,887 2013 121,461 246,893 294,024 325,155 337,087 341,831 354,102 2014 162,647 295,731 360,679 392,731 410,715 416,735 2015 127,511 235,921 299,773 334,271 345,693 2016 159,425 316,190 447,094 481,029 2017 247,895 641,832 773,790 2018 90,429 330,681 2019 151,893 $ 3,209,811 All outstanding liabilities prior to 2012, net of reinsurance 54,040 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,425,530 (Some amounts may not reconcile due to rounding.) Bermuda – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 284,509 $ 262,122 $ 240,949 $ 230,441 $ 236,883 $ 237,315 $ 241,312 $ 241,631 30,273 N/A 2013 228,258 258,432 252,704 261,259 250,627 234,668 230,654 33,689 N/A 2014 211,439 244,163 261,523 257,904 234,196 226,434 48,168 N/A 2015 273,468 301,791 307,957 308,042 309,983 82,925 N/A 2016 292,353 351,182 349,522 357,169 114,651 N/A 2017 354,391 365,767 365,823 181,139 N/A 2018 547,267 546,367 376,744 N/A 2019 667,150 551,529 N/A $ 2,945,212 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 12,864 $ 29,660 $ 51,278 $ 75,680 $ 102,019 $ 130,159 $ 149,629 $ 164,775 2013 16,996 33,951 52,270 77,270 102,866 124,708 144,010 2014 13,580 24,915 42,872 67,716 91,981 115,098 2015 13,643 58,956 93,220 127,930 153,080 2016 45,671 84,152 121,553 155,397 2017 29,904 64,197 103,915 2018 36,678 93,727 2019 61,239 $ 991,242 All outstanding liabilities prior to 2012, net of reinsurance 356,351 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,310,321 (Some amounts may not reconcile due to rounding.) Bermuda – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 238,152 $ 180,775 $ 119,168 $ 117,221 $ 117,909 $ 118,999 $ 117,734 $ 120,824 593 N/A 2013 217,531 142,666 124,191 115,029 114,252 114,800 112,900 272 N/A 2014 186,492 164,139 138,381 134,776 137,389 136,813 1,092 N/A 2015 192,520 157,711 143,625 146,196 143,266 2,204 N/A 2016 206,279 181,593 186,735 187,607 4,619 N/A 2017 393,969 365,405 346,472 10,115 N/A 2018 394,542 396,488 85,786 N/A 2019 343,602 184,640 N/A $ 1,787,971 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 45,573 $ 85,175 $ 90,147 $ 108,172 $ 111,772 $ 113,508 $ 113,816 $ 116,429 2013 34,745 64,560 101,614 108,535 110,378 111,655 111,833 2014 32,813 86,611 106,564 126,552 129,891 131,455 2015 33,814 73,041 109,401 131,387 134,862 2016 26,737 78,499 130,319 167,562 2017 38,106 137,127 250,661 2018 72,580 170,831 2019 66,370 $ 1,150,003 All outstanding liabilities prior to 2012, net of reinsurance 26,236 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 664,204 (Some amounts may not reconcile due to rounding.) Insurance – Casualty Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 349,597 $ 351,402 $ 346,953 $ 348,180 $ 353,320 $ 343,931 $ 346,882 $ 351,320 20,199 15,769 2013 393,539 393,390 392,827 393,035 351,295 344,388 350,815 23,120 21,350 2014 431,068 457,043 454,576 460,642 397,061 397,834 38,872 25,188 2015 519,509 528,050 535,671 542,176 468,584 54,740 26,896 2016 553,437 551,321 580,323 615,168 166,117 31,517 2017 612,967 602,985 625,039 226,898 34,701 2018 705,789 711,001 353,806 33,817 2019 850,832 653,255 30,144 $ 4,370,593 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 33,185 $ 101,288 $ 157,897 $ 213,451 $ 246,407 $ 272,055 $ 294,380 $ 306,833 2013 33,311 117,037 176,312 224,611 260,184 285,822 303,726 2014 41,190 124,915 201,646 256,807 297,644 325,856 2015 44,311 134,730 218,853 291,943 353,232 2016 54,731 164,225 268,909 342,325 2017 53,898 172,200 280,797 2018 63,492 208,081 2019 72,375 $ 2,193,224 All outstanding liabilities prior to 2012, net of reinsurance 300,347 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,477,716 (Some amounts may not reconcile due to rounding.) Insurance – Property Business At December 31, 2019 Total of IBNR Liabilites Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance Plus Expected Years Ended December 31, Development Cumulative 2012 2013 2014 2015 2016 2017 2018 2019 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 106,325 $ 89,000 $ 81,747 $ 82,448 $ 82,019 $ 81,802 $ 81,979 $ 82,526 68 N/A 2013 112,037 98,106 91,251 92,144 92,233 92,393 92,246 471 N/A 2014 131,679 123,668 119,928 119,464 119,282 119,413 407 N/A 2015 172,904 152,895 143,944 146,780 144,769 405 N/A 2016 290,264 275,154 280,170 291,672 736 N/A 2017 496,905 501,407 494,844 13,043 N/A 2018 407,855 401,900 14,862 N/A 2019 348,590 81,655 N/A $ 1,975,961 (Some amounts may not reconcile due to rounding.) Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance Years Ended December 31, 2012 2013 2014 2015 2016 2017 2018 2019 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 56,504 $ 81,772 $ 80,469 $ 81,749 $ 81,891 $ 81,682 $ 81,820 $ 82,457 2013 68,695 93,110 91,841 92,110 91,720 91,759 91,777 2014 81,827 116,037 118,220 118,211 118,545 118,660 2015 102,170 141,280 142,437 145,225 146,719 2016 162,548 249,517 271,938 289,194 2017 178,666 424,181 458,811 2018 244,772 358,324 2019 227,387 $ 1,773,329 All outstanding liabilities prior to 2012, net of reinsurance 644 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 203,277 (Some amounts may not reconcile due to rounding.)
Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance	U.S. Reinsurance – Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 8.4 % 10.3 % 17.7 % 19.6 % 16.6 % 14.4 % 11.7 % 4.6 % U.S. Reinsurance – Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 36.5 % 34.0 % 13.6 % 7.7 % 2.9 % 2.4 % 0.7 % 2.2 % International – Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 16.7 % 13.9 % 12.6 % 8.8 % 8.0 % 8.8 % 6.6 % 4.9 % International – Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 25.9 % 34.1 % 15.6 % 7.2 % 3.2 % 1.5 % 2.5 % 8.6 % Bermuda – Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 7.8 % 9.7 % 9.8 % 10.5 % 10.0 % 10.5 % 8.2 % 6.3 % Bermuda – Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 19.6 % 28.5 % 25.2 % 14.9 % 2.4 % 1.2 % 0.2 % 2.2 % Insurance – Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Casualty 9.1 % 19.8 % 17.4 % 14.0 % 10.9 % 7.2 % 6.7 % 3.3 % Insurance – Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 Property 56.8 % 35.0 % 4.7 % 3.0 % 0.4 % - % 0.1 % - %
Reconciliation of the Net Incurred and Paid Claims Development	December 31, 2019 (Dollars in thousands) Net outstanding liabilities U.S. Reinsurance Casualty $ 2,196,410 U.S. Reinsurance Property 1,572,727 International Casualty 918,411 International Property 1,425,530 Bermuda Casualty 2,310,321 Bermuda Property 664,204 Insurance Casualty 2,477,716 Insurance Property 203,277 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 11,768,596 Reinsurance recoverable on unpaid claims U.S. Reinsurance Casualty 363,925 U.S. Reinsurance Property 207,967 International Casualty 91,193 International Property 149,803 Bermuda Casualty 9,975 Bermuda Property 68,639 Insurance Casualty 631,827 Insurance Property 117,382 Total reinsurance recoverable on unpaid claims 1,640,712 Insurance lines other than short-duration - Unallocated claims adjustment expenses 163,563 Other 38,442 202,005 Total gross liability for unpaid claims and claim adjustment expense $ 13,611,313 (Some amounts may not reconcile due to rounding.)
Summary Of Incurred Losses With Respect To A&E Reserve On Both Gross And Net Of Reinsurance Basis	At December 31, (Dollars in thousands) 2019 2018 2017 Gross basis: Beginning of period reserves $ 347,495 $ 448,994 $ 441,111 Incurred losses 2,070 ( 2,473) 90,009 Paid losses ( 91,644) ( 99,026) ( 82,126) End of period reserves $ 257,921 $ 347,495 $ 448,994 Net basis: Beginning of period reserves $ 261,456 $ 318,081 $ 319,072 Incurred losses - - 37,137 Paid losses ( 32,756) ( 56,624) ( 38,128) End of period reserves $ 228,701 $ 261,456 $ 318,081
Summary Of Activity In The Reserve For Future Policy Benefits	At December 31, (Dollars in thousands) 2019 2018 2017 Balance at beginning of year $ 46,778 $ 51,014 $ 55,074 Liabilities assumed 53 110 115 Adjustments to reserves 350 806 ( 437) Benefits paid in the current year ( 4,589) ( 5,151) ( 3,738) Balance at end of year $ 42,592 $ 46,778 $ 51,014 (Some amounts may not reconcile due to rounding.)

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value [Abstract]
Fair Value Measurement Levels For All Assets And Liabilities	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,515,803 $ - $ 1,515,803 $ - Obligations of U.S. States and political subdivisions 536,915 - 536,915 - Corporate securities 6,374,946 - 5,757,358 617,588 Asset-backed securities 897,333 - 743,692 153,641 Mortgage-backed securities Commercial 844,557 - 844,557 - Agency residential 2,198,581 - 2,198,581 - Non-agency residential 5,703 - 5,703 - Foreign government securities 1,505,950 - 1,505,950 - Foreign corporate securities 2,945,156 - 2,943,406 1,750 Total fixed maturities, market value 16,824,944 - 16,051,965 772,979 Fixed maturities, fair value 5,826 - - 5,826 Equity securities, fair value 931,457 864,584 66,873 - Liabilities: Equity index put option contracts $ 5,584 $ - $ - $ 5,584 Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,631,134 $ - $ 2,631,134 $ - Obligations of U.S. States and political subdivisions 500,094 - 500,094 - Corporate securities 5,445,532 - 5,017,317 428,215 Asset-backed securities 540,097 - 540,097 - Mortgage-backed securities Commercial 326,710 - 326,710 - Agency residential 1,796,264 - 1,796,264 - Non-agency residential 10,209 - 10,209 - Foreign government securities 1,314,165 - 1,314,165 - Foreign corporate securities 2,661,058 - 2,653,314 7,744 Total fixed maturities, market value 15,225,263 - 14,789,304 435,959 Fixed maturities, fair value 2,337 - - 2,337 Equity securities, fair value 716,639 674,433 42,206 - Liabilities: Equity index put option contracts $ 11,958 $ - $ - $ 11,958
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	Total Fixed Maturities, Market Value December 31, 2019 December 31, 2018 Corporate Asset-Backed Foreign Corporate Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 428,215 $ - $ 7,744 $ 435,959 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 4,937 - ( 12) 4,925 ( 92) ( 660) ( 752) Included in other comprehensive income (loss) ( 20) 3,632 ( 110) 3,502 1,091 - 1,091 Purchases, issuances and settlements 179,761 150,009 ( 5,872) 323,898 215,838 ( 298) 215,540 Transfers in and/or (out) of Level 3 4,695 - - 4,695 1,192 1,750 2,942 Ending balance $ 617,588 $ 153,641 $ 1,750 $ 772,979 $ 428,215 $ 7,744 $ 435,959 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value December 31, 2019 December 31, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 2,337 $ 2,337 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings 2,163 2,163 ( 293) ( 293) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements 1,326 1,326 2,630 2,630 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 5,826 $ 5,826 $ 2,337 $ 2,337 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ 1,795 $ 1,795 $ - $ - (Some amounts may not reconcile due to rounding.)
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts	Years Ended December 31, (Dollars in thousands) 2019 2018 Liabilities: Balance, beginning of period $ 11,958 $ 12,477 Total (gains) or losses (realized/unrealized) Included in earnings ( 6,374) ( 520) Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 5,584 $ 11,958 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ - $ - (Some amounts may not reconcile due to rounding.)

Credit Facilities (Tables)

Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2019
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Credit facility interest and fees incurred $ 420 $ 420 $ 420
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ 33,737 12/31/2020 $ 200,000 $ - Tranche Two 2,381 7/29/2020 Tranche Two 1,649 9/30/2020 Tranche Two 573,353 12/31/2020 Tranche Two 600,000 12,364 1/4/2021 600,000 558,818 12/31/2019 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 623,484 $ 800,000 $ 558,818
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 4,425 02/29/2020 $ 200,000 $ 3,482 02/28/2019 512 09/03/2020 3,672 11/24/2019 3,672 11/24/2020 72,443 12/31/2019 177 12/16/2020 296 08/15/2020 125 12/20/2020 177 12/16/2020 101,404 12/31/2020 125 12/20/2020 559 08/15/2021 1,851 11/04/2022 37,096 12/30/2023 407 11/13/2022 - 59,293 12/30/2022 Total Citibank Bilateral Agreement $ 200,000 $ 147,970 $ 200,000 $ 141,746
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At December 31, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 47,000 £ 47,000 12/31/2023 £ 30,000 £ 26,000 12/31/2022 - - - - Total Lloyd's Bank Credit Facility £ 47,000 £ 47,000 £ 30,000 £ 26,000

Senior Notes (Tables)

Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2019
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	December 31, 2019 December 31, 2018 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value Senior notes 6/5/2014 6/1/2044 400,000 $ 397,074 $ 452,848 $ 396,954 $ 396,968
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Years Ended December 31, (Dollars In thousands 2019 2018 2017 Interest expense incurred $ 19,472 $ 19,472 $ 19,472

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	12 Months Ended
	Dec. 31, 2019
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date December 31, 2019 December 31, 2018 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value Long term subordinated notes 4/26/2007 $ 400,000 5/15/2037 5/1/2067 $ 236,758 $ 233,191 $ 236,659 $ 200,390
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Interest expense incurred $ 11,587 $ 10,926 $ 11,498

Collateralized Reinsurance An_2

Collateralized Reinsurance And Trust Agreements (Tables)	12 Months Ended
	Dec. 31, 2019
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Years Ended December 31, Mt. Logan Re Segregated Accounts 2019 2018 2017 (Dollars in thousands) Ceded written premiums 291,979 260,612 245,453 Ceded earned premiums 294,762 262,518 242,793 Ceded losses and LAE 187,192 319,046 320,315 Assumed written premiums 17,005 11,032 25,970 Assumed earned premiums 17,005 11,032 25,970 Assumed losses and LAE - - -

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Supplemental Information Relating to Operating Leases	Year Ended December 31, (Dollars in thousands) 2019 Lease expense incurred: Operating lease cost $ 24,524 At December 31, (Dollars in thousands) 2019 Operating lease right of use assets $ 161,435 Operating lease liabilities 169,909 Year Ended December 31, (Dollars in thousands) 2019 Operating cash flows from operating leases $ ( 20,041) At December 31, 2019 Weighted average remaining operating lease term 12.6 years Weighted average discount rate on operating leases 3.91 %
Maturities of Lease Liabilities	(Dollars in thousands) 2020 $ 19,945 2021 17,153 2022 18,985 2023 18,169 2024 17,872 Thereafter 126,250 Undiscounted lease payments 218,374 Less: present value adjustment 48,465 Total operating lease liability $ 169,909

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Taxes [Abstract]
Components Of The Provision	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Current tax expense (benefit): U.S. $ ( 5,044) $ ( 38,625) $ ( 117,173) Non-U.S. 14,420 6,497 2,849 Total current tax expense (benefit) 9,376 ( 32,128) ( 114,324) Deferred tax expense (benefit): U.S. 80,247 ( 298,998) 50,207 Non-U.S. ( 97) ( 97) 777 Total deferred tax expense (benefit) 80,150 ( 299,095) 50,984 Total income tax expense (benefit) $ 89,526 $ ( 331,223) $ ( 63,340) (Some amounts may not reconcile due to rounding.)
Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate	Years Ended December 31, 2019 2018 2017 (Dollars in thousands) U.S. Non-U.S. U.S. Non-U.S. U.S. Non-U.S. Underwriting gain (loss) $ 38,964 $ 297,199 $ ( 1,407,020) $ 796,745 $ ( 516,167) $ 308,646 Net investment income 325,179 321,960 283,569 297,614 255,310 287,588 Net realized capital gains (losses) 155,609 29,394 ( 90,033) ( 37,103) 148,099 5,095 Net derivative gain (loss) - 6,374 - 520 - 9,581 Corporate expenses ( 13,063) ( 19,903) ( 11,035) ( 19,637) ( 7,394) ( 18,529) Interest, fee and bond issue cost amortization expense ( 34,931) 3,239 ( 30,611) ( 420) ( 31,183) ( 420) Other income (expense) ( 1,976) ( 9,057) ( 5,894) ( 18,877) 32,441 ( 53,656) Pre-tax income (loss) $ 469,782 $ 629,206 $ ( 1,261,024) $ 1,018,842 $ ( 118,894) $ 538,305 Expected tax provision at the applicable statutory rate(s) 98,766 17,205 ( 264,912) 9,647 ( 41,614) 6,843 Increase (decrease) in taxes resulting from: Tax exempt income ( 3,680) - ( 3,824) - ( 8,488) - Dividend received deduction ( 998) - ( 1,520) - ( 4,639) - Proration 1,050 - 1,150 - 1,760 - Affiliated preferred stock dividends 6,517 - 6,517 - 10,861 - Creditable foreign premium tax ( 9,852) - ( 13,475) - ( 7,515) - Tax audit settlement ( 1,576) - ( 2,094) - ( 11,516) - U.S. rate differential on carryback of net operation losses to PY - - ( 43,734) - - - U.S. rate differential on deferred tax 2017 return to provision - - ( 28,411) - - - Share based compensation tax benefits formerly in APIC ( 2,984) ( 373) ( 3,333) ( 120) ( 6,716) ( 235) Impact of U.S. tax reform - - - - 8,246 - Impact of prior year accounting adjustment - - - - ( 8,986) - Change in uncertain tax positions ( 8,434) - 8,434 - - - Other ( 3,606) ( 2,509) 7,579 ( 3,127) 1,641 ( 2,982) Total income tax provision $ 75,203 $ 14,323 $ ( 337,623) $ 6,400 $ ( 66,966) $ 3,626 (Some amounts may not reconcile due to rounding.)
Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits	(Dollars in thousands) 2019 2018 2017 Balance at January 1 $ 8,434 $ - $ - Additions based on tax positions related to the current year - - - Additions for tax positions of prior years - 8,434 - Reductions for tax positions of prior years ( 8,434) - - Settlements with taxing authorities - - - Lapses of applicable statutes of limitations - - - Balance at December 31 $ - $ 8,434 $ -
Net Deferred Income Tax Assets	Years Ended December 31, (Dollars in thousands) 2019 2018 Deferred tax assets: Foreign Tax Credits $ 186,706 $ 167,685 Unearned premium reserves 75,130 63,309 Loss reserves 66,025 64,135 Net operating loss carryforward 31,698 106,543 Net unrealized losses on benefit plans 19,818 17,921 Unrealized foreign currency losses 7,964 12,596 Investment impairments 3,961 1,291 Uncollectible reinsurance reserves 3,142 3,142 Other Tax Credits 2,294 - Net unrealized investment losses - 10,815 Net fair value losses - 7,196 Other assets 13,869 11,521 Total deferred tax assets 410,607 466,154 Deferred tax liabilities: Deferred acquisition costs 81,931 74,736 Net unrealized investment gains 39,413 - Net fair value income 25,936 - Partnership investments 15,039 14,936 Benefit plan asset 2,333 3,600 Other liabilities 4,937 3,868 Total deferred tax liabilities 169,589 97,140 Net deferred tax assets 241,018 369,014 Less: Valuation allowance ( 12,997) ( 9,309) Total net deferred tax assets $ 228,021 $ 359,705 (Some amounts may not reconcile due to rounding.)

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2019
Reinsurance [Abstract]
Premiums Written And Earned And Incurred Losses And LAE	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Written premiums: Direct $ 2,783,036 $ 2,240,951 $ 2,083,555 Assumed 6,350,328 6,234,203 5,090,367 Ceded ( 1,308,940) ( 1,060,726) ( 929,261) Net written premiums $ 7,824,424 $ 7,414,428 $ 6,244,661 Premiums earned: Direct $ 2,551,662 $ 2,129,320 $ 1,825,705 Assumed 6,059,222 5,807,332 4,945,522 Ceded ( 1,207,198) ( 1,004,953) ( 833,387) Net premiums earned $ 7,403,686 $ 6,931,699 $ 5,937,840 Incurred losses and LAE: Direct $ 1,618,686 $ 1,372,589 $ 1,311,682 Assumed 3,923,298 5,046,947 3,909,816 Ceded ( 619,086) ( 768,133) ( 698,917) Net incurred losses and LAE $ 4,922,898 $ 5,651,403 $ 4,522,581

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2019
Other Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Years Ended December 31, 2019 2019 2018 2017 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ 547,539 $ ( 49,665) $ 497,874 $ ( 275,511) $ 21,061 $ ( 254,450) $ ( 81,915) $ 21,597 $ ( 60,318) URA(D) on securities - OTTI ( 1,559) 115 ( 1,444) ( 1,071) ( 135) ( 1,206) ( 5,618) 1,588 ( 4,030) Reclassification of net realized losses (gains) included in net income (loss) ( 13,129) 516 ( 12,613) 28,014 ( 518) 27,496 ( 7,258) 308 ( 6,950) Foreign currency translation adjustments 18,585 ( 4,555) 14,030 ( 86,520) 9,704 ( 76,816) 142,054 ( 20,137) 121,917 Benefit plan actuarial net gain (loss) ( 15,938) 3,347 ( 12,591) ( 646) 136 ( 510) 1,300 ( 273) 1,027 Reclassification of benefit plan liability amortization included in net income (loss) 6,902 ( 1,449) 5,453 6,356 ( 1,335) 5,021 8,426 ( 2,949) 5,477 Total other comprehensive income (loss) $ 542,400 $ ( 51,691) $ 490,709 $ ( 329,378) $ 28,913 $ ( 300,465) $ 56,989 $ 134 $ 57,123
Reclassification From Accumulated Other Comprehensive Income	Years Ended December 31, Affected line item within the statements of AOCI component 2019 2018 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 13,129) $ 28,014 Other net realized capital gains (losses) 516 ( 518) Income tax expense (benefit) $ ( 12,613) $ 27,496 Net income (loss) Benefit plan net gain (loss) $ 6,902 $ 6,356 Other underwriting expenses ( 1,449) ( 1,335) Income tax expense (benefit) $ 5,453 $ 5,021 Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets	Years Ended December 31, (Dollars in thousands) 2019 2018 Beginning balance of URA (D) on securities $ ( 179,392) $ 49,969 Change to beginning balance due to adoption of ASU 2016-01 - ( 1,201) Current period change in URA (D) of investments - temporary 485,261 ( 226,954) Current period change in URA (D) of investments - non-credit OTTI ( 1,444) ( 1,206) Ending balance of URA (D) on securities 304,425 ( 179,392) Beginning balance of foreign currency translation adjustments ( 215,747) ( 138,931) Current period change in foreign currency translation adjustments 14,030 ( 76,816) Ending balance of foreign currency translation adjustments ( 201,717) ( 215,747) Beginning balance of benefit plan net gain (loss) ( 67,418) ( 71,929) Current period change in benefit plan net gain (loss) ( 7,138) 4,511 Ending balance of benefit plan net gain (loss) ( 74,556) ( 67,418) Ending balance of accumulated other comprehensive income (loss) $ 28,152 $ ( 462,557) (Some amounts may not reconcile due to rounding.)

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Summary Of Contributions To Defined Benefit Pension Plans	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Company contributions $ 4,750 $ 77,743 $ 10,534
Summary Of Accumulated Benefit Obligation	At December 31, (Dollars in thousands) 2019 2018 Qualified Plan $ 288,328 $ 237,855 Non-qualified Plan 21,642 24,472 Total $ 309,970 $ 262,327 (Some amounts may not reconcile due to rounding.)
Projected Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in thousands) 2019 2018 Qualified Plan Projected benefit obligation $ 333,715 $ 275,772 Fair value of plan assets 301,467 260,531 Non-qualified Plan Projected benefit obligation $ 21,642 $ 24,472 Fair value of plan assets - -
Accumulated Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in thousands) 2019 2018 Qualified Plan Accumulated benefit obligation $ - $ - Fair value of plan assets - - Non-qualified Plan Accumulated benefit obligation $ 21,642 $ 24,472 Fair value of plan assets - -
Incurred Expenses Related To Defined Contribution Plans For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Incurred expenses $ 10,794 $ 9,301 $ 7,167
Incurred Expenses Related To Defined Contribution Plans For Non-U.S. Employees	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Incurred expenses $ 2,216 $ 2,057 $ 1,849
Changes In The Assumed Healthcare Cost Trend	Percentage Percentage Point Increase Point Decrease (Dollars in thousands) ($ Impact) ($ Impact) a. Effect on total service and interest cost components $ 434 $ ( 335) b. Effect on accumulated post-retirement benefit obligation 6,257 ( 4,833)
Defined Benefit Pension Plan [Member]
Summary Of Pension Expenses	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Pension expense $ 10,042 $ 9,728 $ 16,299
Summary Of Status Of Plan	Years Ended December 31, (Dollars in thousands) 2019 2018 Change in projected benefit obligation: Benefit obligation at beginning of year $ 300,244 $ 316,202 Service cost 8,255 9,801 Interest cost 11,712 10,290 Actuarial (gain)/loss 46,206 ( 29,966) Curtailment - - Benefits paid ( 11,062) ( 6,084) Projected benefit obligation at end of year 355,356 300,244 Change in plan assets: Fair value of plan assets at beginning of year 260,531 210,267 Actual return on plan assets 47,247 ( 21,395) Actual contributions during the year 4,750 77,743 Administrative expenses paid - - Benefits paid ( 11,062) ( 6,084) Fair value of plan assets at end of year 301,467 260,531 Funded status at end of year $ ( 53,889) $ ( 39,713) (Some amounts may not reconcile due to rounding.)
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in thousands) 2019 2018 Other assets (due beyond one year) $ - $ - Other liabilities (due within one year) ( 7,362) ( 7,530) Other liabilities (due beyond one year) ( 46,527) ( 32,182) Net amount recognized in the consolidated balance sheets $ ( 53,889) $ ( 39,713) (Some amounts may not reconcile due to rounding.)
Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)	At December 31, (Dollars in thousands) 2019 2018 Accumulated income (loss) $ ( 97,466) $ ( 88,580) Accumulated other comprehensive income (loss) $ ( 97,466) $ ( 88,580) (Some amounts may not reconcile due to rounding.)
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in thousands) 2019 2018 Other comprehensive income (loss) at December 31, prior year $ ( 88,580) $ ( 86,788) Net gain (loss) arising during period ( 16,927) ( 8,631) Recognition of amortizations in net periodic benefit cost: Actuarial loss 8,042 6,839 Curtailment loss recognized - - Other comprehensive income (loss) at December 31, current year $ ( 97,466) $ ( 88,580) (Some amounts may not reconcile due to rounding.)
Net Periodic Benefit Cost For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Service cost $ 8,255 $ 9,801 $ 10,949 Interest cost 11,712 10,290 10,034 Expected return on assets ( 17,968) ( 17,202) ( 13,050) Amortization of actuarial loss from earlier periods 7,635 6,839 8,366 Settlement 408 - - Net periodic benefit cost $ 10,042 $ 9,728 $ 16,299 Other changes recognized in other comprehensive income (loss): Other comprehensive income (loss) attributable to change from prior year 8,885 1,792 Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 18,927 $ 11,520 (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in thousands) 2019 15,670 2020 11,458 2021 12,198 2022 12,902 2023 13,985 Next 5 years 84,334
Fair Value Measurement Levels For Qualified Plan Assets	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2019 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 1,749 $ 1,749 $ - $ - Mutual funds, fair value Fixed income (b) 90,483 90,483 - - Equities (c) 188,884 188,884 - - Total $ 281,116 $ 281,116 $ - $ - (Some amounts may not reconcile due to rounding.) (a) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70% in U.S. securities and 30% in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50% in U.S. equities and 50% in international equities. Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 2,872 $ 2,872 $ - $ - Mutual funds, fair value Fixed income (b) 82,633 82,633 - - Equities (c) 154,935 154,935 - - Total $ 240,440 $ 240,440 $ - $ - (Some amounts may not reconcile due to rounding.) (a) This category includes high quality, short-term money market instruments, which are issued and payable in U.S. dollars. (b) This category includes fixed income funds, which invest in investment grade securities of corporations, governments and government agencies with approximately 70% in U.S. securities and 30% in international securities. (c) This category includes funds, which invest in small, mid and multi-cap equity securities including common stocks, securities convertible into common stock and securities with common stock characteristics, such as rights and warrants, with approximately 50% in U.S. equities and 50% in international equities.
Post-Retirement Plan [Member]
Summary Of Status Of Plan	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Post-retirement benefit expenses $ 1,231 $ 1,829 $ 2,814
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in thousands) 2019 2018 Other liabilities (due within one year) $ ( 611) $ ( 608) Other liabilities (due beyond one year) ( 28,764) ( 27,875) Net amount recognized in the consolidated balance sheets $ ( 29,376) $ ( 28,483) (Some amounts may not reconcile due to rounding.)
Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)	At December 31, (Dollars in thousands) 2019 2018 Accumulated income (loss) $ 188 $ ( 238) Accumulated prior service credit (cost) 2,904 3,480 Accumulated other comprehensive income (loss) $ 3,092 $ 3,242
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in thousands) 2019 2018 Other comprehensive income (loss) at December 31, prior year $ 3,242 $ ( 4,260) Net gain (loss) arising during period 582 7,985 Prior Service credit (cost) arising during period - - Recognition of amortizations in net periodic benefit cost: Actuarial loss (gain) ( 155) 94 Prior service cost ( 577) ( 577) Other comprehensive income (loss) at December 31, current year $ 3,092 $ 3,242
Net Periodic Benefit Cost For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Service cost $ 983 $ 1,312 $ 1,570 Interest cost 980 999 1,184 Prior service credit recognition ( 577) ( 577) ( 131) Net gain recognition ( 155) 94 192 Net periodic cost $ 1,231 $ 1,829 $ 2,814 Other changes recognized in other comprehensive income (loss): Other comprehensive gain (loss) attributable to change from prior year 150 ( 7,502) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 1,381 $ ( 5,673) (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in thousands) 2019 $ 611 2020 673 2021 768 2022 851 2023 896 Next 5 years 6,377
Post-Retirement Benefit Expenses	At December 31, (Dollars in thousands) 2019 2018 Change in projected benefit obligation: Benefit obligation at beginning of year $ 28,483 $ 34,717 Service cost 983 1,312 Interest cost 980 999 Amendments ( 582) - Actuarial (gain)/loss - ( 7,985) Benefits paid ( 488) ( 561) Benefit obligation at end of year 29,376 28,483 Change in plan assets: Fair value of plan assets at beginning of year - - Employer contributions 488 561 Benefits paid ( 488) ( 561) Fair value of plan assets at end of year - - Funded status at end of year $ ( 29,376) $ ( 28,483)

Dividend Restrictions And Sta_2

Dividend Restrictions And Statutory Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Dividend Restrictions And Statutory Financial Information [Abstract]
Regulatory Targeted Capital And The Actual Statutory Capital	Bermuda Re (1) Everest Re (1) At December 31, At December 31, (Dollars in thousands) 2019 (1) 2018 2019 2018 Regulatory targeted capital $ - $ 1,753,156 $ 2,001,226 $ 2,172,958 Actual capital $ 3,197,418 $ 3,068,534 $ 3,739,140 $ 3,650,594 (a) Regulatory targeted capital represents the target capital level from the applicable year's BSCR calculation. (b) Regulatory targeted capital represents 200% of the RBC authorized control level calculation for the applicable year. (c) The 2019 BSCR calculation is not yet due to be completed; however, the Company anticipates that Bermuda Re's December 31, 2019 actual capital will exceed the targeted capital level.

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At December 31, (Dollars in thousands) 2019 2018 The Prudential $ 141,703 $ 142,754 Unaffiliated life insurance company 35,082 34,717

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Share-Based Compensation Plans [Abstract]
Company's Shareholder Approved Plans	Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2019 279,164 $ 83.84 Granted – - Exercised 108,460 78.58 Forfeited/Cancelled/Expired – - Outstanding at December 31, 2019 170,704 87.18 1.4 $ 32,376 . Exercisable at December 31, 2019 170,704 87.18 1.4 $ 32,376 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2018 360,364 $ 84.10 Granted - - Exercised 81,200 84.99 Forfeited/Cancelled/Expired - - Outstanding at December 31, 2018 279,164 83.84 1.9 $ 37,386 Exercisable at December 31, 2018 279,164 83.84 1.9 $ 37,386 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2017 454,994 $ 84.88 Granted - - Exercised 94,630 87.84 Forfeited/Cancelled/Expired - - Outstanding at December 31, 2017 360,364 84.10 2.7 $ 49,428 Exercisable at December 31, 2017 360,364 84.10 2.7 $ 49,428
Share Options Outstanding And Exercisable	At December 31, 2019 Options Outstanding Opotions Exercisable Weighted- Average Weighted- Weighted- Number Remaining Average Number Average Range of Outstanding Contractual Exercise Exercisable Exercise Exercise Prices at 12/31/19 Life Price at 12/31/19 Price $ 84.6300 - $ 85.6300 31,100 0.2 $ 84.63 31,100 $ 84.63 $ 85.6400 - $ 87.4700 59,900 1.2 86.62 59,900 86.62 $ 87.4800 - $ 89.4100 73,750 2.1 88.32 73,750 88.32 $ 89.4200 - $ 110.1300 5,954 1.5 91.99 5,954 91.99 170,704 1.4 87.18 170,704 87.18
Summary Of Company's Non-Vested Shares And Changes	Years Ended December 31, 2019 2018 2017 Weighted- Weighted- Weighted- Average Average Average Grant Date Grant Date Grant Date Restricted (non-vested) Shares Shares Fair Value Shares Fair Value Shares Fair Value Outstanding at January 1, 414,407 $ 217.15 421,261 $ 194.01 435,338 $ 164.21 Granted 232,601 - 173,065 240.59 160,185 234.01 Vested 138,322 - 141,982 178.31 152,397 151.80 Forfeited 13,549 - 37,937 212.48 21,865 187.82 Outstanding at December 31, 495,137 - 414,407 217.15 421,261 194.01
Company's Non-Vested Performance Share Unit Awards	Years Ended December 31, 2019 2018 2017 Weighted- Weighted- Weighted- Average Average Average Grant Date Grant Date Grant Date Performance Share Unit Awards Shares Fair Value Shares Fair Value Shares Fair Value Outstanding at January 1, 32,382 $ - 33,454 $ - 21,223 $ - Granted 16,855 223.45 13,325 242.39 11,245 234.03 Increase/(Decrease) on vesting units due to performance ( 3,455) - ( 267) - 986 - Vested 10,922 223.45 12,435 242.39 - - Forfeited - - 1,695 - - - Outstanding at December 31, 34,850 - 32,382 - 33,454 -

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	U.S. Reinsurance Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 2,962,416 $ 3,014,338 $ 2,592,972 Net written premiums 2,513,579 2,642,182 2,245,422 Premiums earned $ 2,471,447 $ 2,528,991 $ 2,181,160 Incurred losses and LAE 1,514,151 2,784,181 1,632,795 Commission and brokerage 703,803 568,374 462,487 Other underwriting expenses 68,796 60,266 55,881 Underwriting gain (loss) $ 184,697 $ ( 883,830) $ 29,997 International Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 1,648,598 $ 1,543,946 $ 1,316,701 Net written premiums 1,551,753 1,458,745 1,229,597 Premiums earned $ 1,475,669 $ 1,439,882 $ 1,202,043 Incurred losses and LAE 1,193,816 992,704 1,059,640 Commission and brokerage 342,400 364,010 287,688 Other underwriting expenses 41,690 39,042 38,844 Underwriting gain (loss) $ ( 102,237) $ 44,126 $ ( 184,129) Bermuda Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 1,744,875 $ 1,666,317 $ 1,205,001 Net written premiums 1,666,940 1,605,526 1,139,082 Premiums earned $ 1,544,180 $ 1,324,198 $ 1,093,250 Incurred losses and LAE 967,211 808,717 735,292 Commission and brokerage 354,044 319,197 303,707 Other underwriting expenses 50,348 43,566 38,011 Underwriting gain (loss) $ 172,577 $ 152,718 $ 16,240 Insurance Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Gross written premiums $ 2,777,475 $ 2,250,552 $ 2,059,248 Net written premiums 2,092,152 1,707,975 1,630,560 Premiums earned $ 1,912,390 $ 1,638,628 $ 1,461,387 Incurred losses and LAE 1,247,720 1,065,801 1,094,854 Commission and brokerage 303,479 267,449 250,081 Other underwriting expenses 280,065 228,667 186,081 Underwriting gain (loss) $ 81,126 $ 76,711 $ ( 69,629)
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Years Ended December 31, (Dollars in thousands) 2019 2018 2017 Underwriting gain (loss) $ 336,163 $ ( 610,275) $ ( 207,521) Net investment income 647,139 581,183 542,898 Net realized capital gains (losses) 185,004 ( 127,136) 153,194 Net derivative gain (loss) 6,374 520 9,581 Corporate expenses ( 32,966) ( 30,672) ( 25,923) Interest, fee and bond issue cost amortization expense ( 31,693) ( 31,031) ( 31,603) Other income (expense) ( 11,034) ( 24,771) ( 21,215) Income (loss) before taxes $ 1,098,987 $ ( 242,182) $ 419,411
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Year Ended December 31, (Dollars in thousands) 2019 2018 2017 United Kingdom gross written premium $ 964,358 $ 914,612 $ 730,826

Unaudited Quarterly Financial_2

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2019
Unaudited Quarterly Financial Data [Abstract]
Summary Of Quarterly Financial Data	2019 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 2,127,108 $ 2,166,655 $ 2,403,274 $ 2,436,327 Net written premiums 1,851,698 1,783,983 2,068,557 2,120,186 Premiums earned 1,732,697 1,817,299 1,905,619 1,948,071 Net investment income 140,976 179,028 181,058 146,077 Net realized capital gains (losses) 92,232 30,272 ( 12,943) 75,443 Total claims and underwriting expenses 1,537,009 1,620,413 1,933,158 1,976,943 Net income (loss) 354,551 332,868 104,398 217,644 Earnings per common share attributable to Everest Re Group: Basic $ 8.70 $ 8.17 $ 2.56 $ 5.34 Diluted $ 8.67 $ 8.15 $ 2.56 $ 5.32 2018 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,931,607 $ 2,066,521 $ 2,198,664 $ 2,278,361 Net written premiums 1,672,206 1,746,378 1,938,773 2,057,071 Premiums earned 1,619,427 1,729,818 1,731,479 1,850,975 Net investment income 138,294 141,322 161,363 140,204 Net realized capital gains (losses) ( 24,901) 15,776 54,804 ( 172,815) Total claims and underwriting expenses 1,511,100 1,817,815 1,731,201 2,481,858 Net income (loss) 215,186 60,787 198,381 ( 385,313) Earnings per common share attributable to Everest Re Group: Basic $ 5.26 $ 1.49 $ 4.87 $ ( 9.58) Diluted $ 5.23 $ 1.48 $ 4.84 $ ( 9.58)

Revisions To Financial Statem_2

Revisions To Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2019
Revisions To Financial Statements [Abstract]
Schedule of Prior Period Financial Statements	CONSOLIDATED BALANCE SHEETS December 31, 2018 December 31, 2017 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) ASSETS: Premiums Receivable $ 2,218,283 $ ( 35,100) $ 2,183,183 $ 1,844,881 $ ( 25,106) $ 1,819,775 Funds held by reinsureds 445,040 ( 10,009) 435,031 292,927 ( 4,292) 288,635 Income taxes 592,385 2,102 594,487 299,438 902 300,340 TOTAL ASSETS $ 24,793,999 $ ( 43,007) $ 24,750,992 $ 23,591,792 $ ( 28,496) $ 23,563,296 SHAREHOLDERS' EQUITY: Retained earnings 9,574,440 ( 43,007) 9,531,433 9,685,908 ( 28,496) 9,657,412 Total shareholders' equity 7,903,804 ( 43,007) 7,860,797 8,369,232 ( 28,496) 8,340,736 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 24,793,999 $ ( 43,007) $ 24,750,992 $ 23,591,792 $ ( 28,496) $ 23,563,296 CONSOLIDATED BALANCE SHEETS June 30, 2019 March 31, 2019 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) ASSETS: Premiums Receivable $ 2,389,943 $ ( 38,836) $ 2,351,107 $ 2,392,094 $ ( 29,831) $ 2,362,263 Funds held by reinsureds 498,043 ( 10,768) 487,275 432,736 ( 9,525) 423,211 Income taxes 358,457 2,261 360,718 475,851 2,000 477,851 TOTAL ASSETS $ 26,387,791 $ ( 47,343) $ 26,340,448 $ 25,630,507 $ ( 37,356) $ 25,593,151 SHAREHOLDERS' EQUITY: Retained earnings 10,152,059 ( 47,343) 10,104,716 9,866,203 ( 37,356) 9,828,847 Total stockholder's equity 8,884,160 ( 47,343) 8,836,817 8,426,629 ( 37,356) 8,389,273 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 26,387,791 $ ( 47,343) $ 26,340,448 $ 25,630,507 $ ( 37,356) $ 25,593,151 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Year Ended December 31, 2018 Year Ended December 31, 2017 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 9,060) $ ( 15,711) $ ( 24,771) $ ( 35,442) $ 14,227 $ ( 21,215) Total revenues $ 7,377,206 $ ( 15,711) $ 7,361,495 $ 6,608,071 $ 14,227 $ 6,622,298 INCOME (LOSS) BEFORE TAXES $ ( 226,471) $ ( 15,711) $ ( 242,182) $ 405,184 $ 14,227 $ 419,411 Income tax expense (benefit) ( 330,023) ( 1,200) ( 331,223) ( 63,784) 444 ( 63,340) NET INCOME (LOSS) $ 103,552 $ ( 14,511) $ 89,041 $ 468,968 $ 13,783 $ 482,751 COMPREHENSIVE INCOME (LOSS) $ ( 196,913) $ ( 14,511) $ ( 211,424) $ 526,091 $ 13,783 $ 539,874 EARNINGS PER COMMON SHARE: Basic $ 2.54 $ ( 0.36) $ 2.18 $ 11.43 $ 0.34 $ 11.77 Diluted $ 2.53 $ ( 0.36) $ 2.17 $ 11.36 $ 0.34 $ 11.70 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 7,977) $ ( 10,248) $ ( 18,225) $ ( 17,030) $ ( 4,495) $ ( 21,525) Total revenues $ 2,018,975 $ ( 10,248) $ 2,008,727 $ 3,979,058 $ ( 4,495) $ 3,974,563 INCOME (LOSS) BEFORE TAXES $ 382,593 $ ( 10,248) $ 372,345 $ 791,384 $ ( 4,495) $ 786,889 Income tax expense (benefit) 39,738 ( 261) 39,477 99,629 ( 159) 99,470 NET INCOME (LOSS) $ 342,855 $ ( 9,987) $ 332,868 $ 691,755 $ ( 4,336) $ 687,419 COMPREHENSIVE INCOME (LOSS) $ 514,064 $ ( 9,987) $ 504,077 $ 1,109,410 $ ( 4,336) $ 1,105,074 EARNINGS PER COMMON SHARE: Basic $ 8.42 $ ( 0.25) $ 8.17 $ 16.98 $ ( 0.10) $ 16.88 Diluted $ 8.39 $ ( 0.24) $ 8.15 $ 16.93 $ ( 0.11) $ 16.82 CONSOLIDATED STATEMENTS OF OPERATIONS Three Months Ended March 31, 2,019 AND COMPREHENSIVE INCOME (LOSS): As Previously Impact of Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 9,053) $ 5,753 $ ( 3,300) Total revenues $ 1,960,083 $ 5,753 $ 1,965,836 INCOME (LOSS) BEFORE TAXES $ 408,791 $ 5,753 $ 414,544 Income tax expense (benefit) 59,891 102 59,993 NET INCOME (LOSS) $ 348,900 $ 5,651 $ 354,551 COMPREHENSIVE INCOME (LOSS) $ 595,346 $ 5,651 $ 600,997 EARNINGS PER COMMON SHARE: Basic $ 8.57 $ 0.13 $ 8.70 Diluted $ 8.54 $ 0.13 $ 8.67 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ ( 5,458) $ ( 7,950) $ ( 13,408) $ 9,642 $ ( 12,590) $ ( 2,948) Total revenues $ 1,944,413 $ ( 7,950) $ 1,936,463 $ 5,582,509 $ ( 12,590) $ 5,569,919 INCOME (LOSS) BEFORE TAXES $ 197,421 $ ( 7,950) $ 189,471 $ 475,827 $ ( 12,590) $ 463,237 Income tax expense (benefit) ( 8,192) ( 718) ( 8,910) ( 9,999) ( 1,118) ( 11,117) NET INCOME (LOSS) $ 205,613 $ ( 7,232) $ 198,381 $ 485,826 $ ( 11,472) $ 474,354 COMPREHENSIVE INCOME (LOSS) $ 180,634 $ ( 7,232) $ 173,402 $ 177,601 $ ( 11,472) $ 166,129 EARNINGS PER COMMON SHARE: Basic $ 5.04 $ ( 0.17) $ 4.87 $ 11.89 $ ( 0.28) $ 11.61 Diluted $ 5.02 $ ( 0.18) $ 4.84 $ 11.83 $ ( 0.28) $ 11.55 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 INCOME (LOSS): As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ 3,036 $ ( 9,609) $ ( 6,573) $ 15,100 $ ( 4,640) $ 10,460 Total revenues $ 1,892,939 $ ( 9,609) $ 1,883,330 $ 3,638,096 $ ( 4,640) $ 3,633,456 INCOME (LOSS) BEFORE TAXES $ 60,763 $ ( 9,609) $ 51,154 $ 278,406 $ ( 4,640) $ 273,766 Income tax expense (benefit) ( 9,132) ( 501) ( 9,633) ( 1,807) ( 400) ( 2,207) NET INCOME (LOSS) $ 69,895 $ ( 9,108) $ 60,787 $ 280,213 $ ( 4,240) $ 275,973 COMPREHENSIVE INCOME (LOSS) $ ( 33,469) $ ( 9,108) $ ( 42,577) $ ( 3,033) $ ( 4,240) $ ( 7,273) EARNINGS PER COMMON SHARE: Basic $ 1.71 $ ( 0.22) $ 1.49 $ 6.85 $ ( 0.10) $ 6.75 Diluted $ 1.70 $ ( 0.22) $ 1.48 $ 6.81 $ ( 0.10) $ 6.71 CONSOLIDATED STATEMENTS OF OPERATIONS Three Months Ended March 31, 2018 AND COMPREHENSIVE INCOME (LOSS): As Previously Impact of Reported Revisions As Revised (Dollars in thousands) Revenues: Other income (expense) $ 12,064 $ 4,969 $ 17,033 Total revenues $ 1,745,157 $ 4,969 $ 1,750,126 INCOME (LOSS) BEFORE TAXES $ 217,643 $ 4,969 $ 222,612 Income tax expense (benefit) 7,325 101 7,426 NET INCOME (LOSS) $ 210,318 $ 4,868 $ 215,186 COMPREHENSIVE INCOME (LOSS) $ 30,436 $ 4,868 $ 35,304 EARNINGS PER COMMON SHARE: Basic $ 5.14 $ 0.12 $ 5.26 Diluted $ 5.11 $ 0.12 $ 5.23 CONSOLIDATED STATEMENTS OF Year Ended December 31, 2018 Year Ended December 31, 2017 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,685,908 $ ( 28,496) $ 9,657,412 $ 9,422,932 $ ( 42,279) $ 9,380,653 Net income (loss) 103,552 ( 14,511) 89,041 468,968 13,783 482,751 Balance, end of period 9,574,440 ( 43,007) 9,531,433 9,685,908 ( 28,496) 9,657,412 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 7,903,804 $ ( 43,007) $ 7,860,797 $ 8,369,232 $ ( 28,496) $ 8,340,736 CONSOLIDATED STATEMENTS OF Six Months Ended June 30, 2019 Three Months Ended March 31, 2019 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, January 1 $ 9,574,440 $ ( 43,007) $ 9,531,433 $ 9,574,440 $ ( 43,007) $ 9,531,433 Net income (loss) 348,900 5,651 354,551 348,900 5,651 354,551 Balance, March 31 9,866,203 ( 37,356) 9,828,847 9,866,203 ( 37,356) 9,828,847 Net income (loss) 342,855 ( 9,987) 332,868 Balance, June 30, 10,152,059 ( 47,343) 10,104,716 TOTAL STOCKHOLDER'S EQUITY, June 30 $ 8,884,160 $ ( 47,343) $ 8,836,817 $ 8,426,629 $ ( 37,356) $ 8,389,273 CONSOLIDATED STATEMENTS OF Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,860,842 $ ( 32,736) $ 9,828,106 $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 205,613 ( 7,232) 198,381 485,826 ( 11,472) 474,354 Balance, end of period 10,013,592 ( 39,968) 9,973,624 10,013,592 ( 39,968) 9,973,624 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,329,013 $ ( 39,968) $ 8,289,045 $ 8,329,013 $ ( 39,968) $ 8,289,045 CONSOLIDATED STATEMENTS OF Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,844,187 $ ( 23,628) $ 9,820,559 $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 69,895 ( 9,108) 60,787 280,213 ( 4,240) 275,973 Balance, end of period 9,860,842 ( 32,736) 9,828,106 9,860,842 ( 32,736) 9,828,106 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,241,349 $ ( 32,736) $ 8,208,613 $ 8,241,349 $ ( 32,736) $ 8,208,613 CONSOLIDATED STATEMENTS OF Three Months Ended March 31, 2018 CHANGES IN STOCKHOLDER'S EQUITY As Previously Impact of Reported Revisions As Revised (Dollars in thousands) RETAINED EARNINGS: Balance, beginning of period $ 9,685,908 $ ( 28,496) $ 9,657,412 Net income (loss) 210,318 4,868 215,186 Balance, end of period 9,844,187 ( 23,628) 9,820,559 TOTAL STOCKHOLDER'S EQUITY, END OF PERIOD $ 8,344,180 $ ( 23,628) $ 8,320,552 CONSOLIDATED STATEMENTS OF CASH FLOWS Year Ended December 31, 2018 Year Ended December 31, 2017 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 103,552 $ ( 14,511) $ 89,041 $ 468,968 $ 13,783 $ 482,751 Decrease (increase) in premiums receivable ( 392,981) 9,994 ( 382,987) ( 338,335) ( 12,111) ( 350,446) Decrease (increase) in funds held by reinsureds, net ( 159,344) 5,717 ( 153,627) ( 31,104) ( 2,116) ( 33,220) Decrease (increase) in income taxes ( 263,865) ( 1,200) ( 265,065) ( 114,521) 444 ( 114,077) CONSOLIDATED STATEMENTS OF CASH FLOWS Six Months Ended June 30, 2019 Three Months Ended March 31, 2019 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 691,755 $ ( 4,336) $ 687,419 $ 348,900 $ 5,651 $ 354,551 Decrease (increase) in premiums receivable ( 178,319) 3,736 ( 174,583) ( 163,108) ( 5,269) ( 168,377) Decrease (increase) in funds held by reinsureds, net ( 56,180) 759 ( 55,421) 9,837 ( 484) 9,353 Decrease (increase) in income taxes 180,285 ( 159) 180,126 91,754 102 91,856 CONSOLIDATED STATEMENTS OF CASH FLOWS Nine Months Ended September 30, 2018 Six Months Ended June 30, 2018 As Previously Impact of As Previously Impact of Reported Revisions As Revised Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 485,826 $ ( 11,472) $ 474,354 $ 280,213 $ ( 4,240) $ 275,973 Decrease (increase) in premiums receivable ( 264,556) 7,265 ( 257,291) ( 126,355) 2,733 ( 123,622) Decrease (increase) in funds held by reinsureds, net ( 78,514) 5,325 ( 73,189) ( 77,794) 1,907 ( 75,887) Decrease (increase) in income taxes 59,034 ( 1,118) 57,916 43,516 ( 400) 43,116 CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2018 As Previously Impact of Reported Revisions As Revised (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 210,318 $ 4,868 $ 215,186 Decrease (increase) in premiums receivable ( 56,826) ( 4,489) ( 61,315) Decrease (increase) in funds held by reinsureds, net 95,416 ( 480) 94,936 Decrease (increase) in income taxes 55,905 101 56,006

Summary Of Significant Accoun_4

Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019USD ($)Itemshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares	Dec. 31, 2005Item	Dec. 31, 2001Item	Jan. 01, 2019USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Summary Of Significant Accounting Policies [Line Items]
Minimum percent of prepaid reinsurance premiums for any foreign reinsurers that were collateralized	10.00%
Number of operating segments | Item	4
Equity index put option contracts sold | Item				7	7
Derivatives, number of indices | Item				2	2
Derivative liability	$ 5,584,000	$ 11,958,000
Anti-dilutive options | shares	0	0	0
U.S. tax rate	21.00%	21.00%	35.00%
Operating lease right of use assets	$ 161,435,000					$ 69,869,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]						Other assets
Operating lease liabilities	$ 169,909,000					$ 77,270,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]						Other liabilities
Accumulated Other Comprehensive Income [Member]
Summary Of Significant Accounting Policies [Line Items]
Change to beginning balance due to adoption of Accounting Standards Update 2016-01			$ (1,201,000)				$ (1,250,000)	$ (1,250,000)
Retained Earnings [Member]
Summary Of Significant Accounting Policies [Line Items]
Change to beginning balance due to adoption of Accounting Standards Update 2016-01			$ 1,201,000			$ 0	$ 1,250,000	$ 1,250,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Options expiration date	Feb. 24, 2020
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Options expiration date	Sep. 19, 2022
Expired Derivative [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of derivatives | Item	4
Derivative liability	$ 0

Summary Of Significant Accoun_5

Summary Of Significant Accounting Policies (Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract]
Reinsurance receivables and premium receivables	$ 25,605	$ 25,611

Summary Of Significant Accoun_6

Summary Of Significant Accounting Policies (Schedule Of Deferred Acquisition Costs Amortized To Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract]
Deferred acquisition costs	$ 1,703,726	$ 1,519,030	$ 1,303,963

Summary Of Significant Accoun_7

Summary Of Significant Accounting Policies (Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Abstract]
Net income (loss)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	$ 1,009,461	$ 89,041	$ 482,751
Less: dividends declared-common shares and nonvested common shares												(234,322)	(216,221)	(207,242)
Undistributed earnings												$ 775,139	$ (127,180)	$ 275,508
Percentage allocated to common shareholders												98.90%	99.00%	98.90%
Net income (loss) available to common stockholders, total												$ 766,386	$ (125,848)	$ 272,589
Add: dividends declared-common shareholders												231,796	214,088	205,182
Numerator for basic and diluted earnings per common share												$ 998,182	$ 88,239	$ 477,771
Denominator for basic earnings per weighted-average common shares												40,291	40,388	40,595
Effect of dilutive securities: Options												129	198	248
Denominator for diluted earnings per adjusted weighted-average common shares												40,420	40,586	40,843
Basic	$ 5.34	$ 2.56	$ 8.17	$ 8.70	$ (9.58)	$ 4.87	$ 1.49	$ 5.26	$ 16.88	$ 6.75	$ 11.61	$ 24.77	$ 2.18	$ 11.77
Diluted	$ 5.32	$ 2.56	$ 8.15	$ 8.67	$ (9.58)	$ 4.84	$ 1.48	$ 5.23	$ 16.82	$ 6.71	$ 11.55	$ 24.70	$ 2.17	$ 11.70
Basic weighted-average common shares outstanding												40,291	40,388	40,595
Basic weighted-average common shares outstanding and nonvested common shares expected to vest												40,751	40,816	41,030
Anti-dilutive options												0	0	0

Summary Of Significant Accoun_8

Summary Of Significant Accounting Policies (Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 5,584	$ 11,958
Derivatives Not Designated As Hedging Instruments [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	5,584	11,958
Equity Index Put Option Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 5,584	$ 11,958

Summary Of Significant Accoun_9

Summary Of Significant Accounting Policies (Change In Fair Value Of The Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Option Indexed to Issuer's Equity [Line Items]
Net derivative gain (loss)	$ 6,374	$ 520	$ 9,581
Derivatives Not Designated As Hedging Instruments [Member] | Equity Index Put Option Contracts [Member]
Option Indexed to Issuer's Equity [Line Items]
Net derivative gain (loss)	$ 6,374	$ 520	$ 9,581

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value			80.00%
Additional contractual commitments		$ 1,016,811,000
Contractual commitments, investment period expiration date		Jan. 1, 2026
Reclassification of other invested assets to fixed maturity securities	$ 143,656,000
Reclassification of other invested assets to short-term investments	$ 243,864,000
Securities, carrying value		$ 1,549,145,000
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position		3,639,991,000	$ 9,814,849,000
Gross unrealized losses on investments in unrealized loss position		121,169,000	367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		26,793,000	120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		94,376,000	247,060,000
Gross unrealized depreciation			367,898,000
Market value of investments		$ 16,824,944,000	$ 15,225,263,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value			1.00%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer		0.80%	5.70%
Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		$ 23,104,000	$ 74,729,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		73,144,000	230,560,000
Sub-prime and Alt-A Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized depreciation		0	$ 0
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Market value of investments		$ 308,711,000

Investments (Summary Of Unreali

Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 16,473,491
Unrealized Appreciation	472,622
Unrealized Depreciation	(121,169)
OTTI in AOCI	987
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,473,491	$ 15,406,572
Unrealized Appreciation	472,622	186,589
Unrealized Depreciation	(121,169)	(367,898)
Market Value	16,824,944	15,225,263
OTTI in AOCI	987	2,545
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,489,660	2,629,454
Unrealized Appreciation	28,357	16,781
Unrealized Depreciation	(2,214)	(15,101)
Market Value	1,515,803	2,631,134
OTTI in AOCI
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	507,353	490,018
Unrealized Appreciation	29,651	12,915
Unrealized Depreciation	(89)	(2,839)
Market Value	536,915	500,094
OTTI in AOCI		439
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,227,661	5,538,582
Unrealized Appreciation	185,052	48,465
Unrealized Depreciation	(37,767)	(141,515)
Market Value	6,374,946	5,445,532
OTTI in AOCI	469	1,688
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	892,373	545,427
Unrealized Appreciation	6,818	162
Unrealized Depreciation	(1,858)	(5,492)
Market Value	897,333	540,097
OTTI in AOCI
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	814,570	329,883
Unrealized Appreciation	31,236	2,167
Unrealized Depreciation	(1,249)	(5,340)
Market Value	844,557	326,710
OTTI in AOCI
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,173,099	1,832,760
Unrealized Appreciation	36,361	7,325
Unrealized Depreciation	(10,879)	(43,821)
Market Value	2,198,581	1,796,264
OTTI in AOCI
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,723	10,198
Unrealized Appreciation		37
Unrealized Depreciation	(20)	(26)
Market Value	5,703	10,209
OTTI in AOCI
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,492,315	1,335,328
Unrealized Appreciation	47,148	34,743
Unrealized Depreciation	(33,513)	(55,906)
Market Value	1,505,950	1,314,165
OTTI in AOCI	71	98
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,870,737	2,694,922
Unrealized Appreciation	107,999	63,994
Unrealized Depreciation	(33,580)	(97,858)
Market Value	2,945,156	2,661,058
OTTI in AOCI	$ 447	$ 320

Investments (Summary Of Amortiz

Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 16,473,491	$ 15,406,572
Fixed maturity securities - available for sale, Market Value	16,824,944	15,225,263
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,456,960	1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,757,107	8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	3,471,370	2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	902,289	789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,457,919	1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,869,359	8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	3,609,816	2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value	941,676	791,113
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	892,373	545,427
Fixed maturity securities - available for sale, Market Value	897,333	540,097
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	814,570	329,883
Fixed maturity securities - available for sale, Market Value	844,557	326,710
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,173,099	1,832,760
Fixed maturity securities - available for sale, Market Value	2,198,581	1,796,264
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	5,723	10,198
Fixed maturity securities - available for sale, Market Value	$ 5,703	$ 10,209

Investments (Summary Of Changes

Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Deferred tax benefit (expense)	$ (80,150)	$ 299,095	$ (50,984)
Total URA(D) on securities arising during the period	483,817	(228,160)	$ (71,298)
Amortized Cost [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	532,851	(248,568)
Deferred tax benefit (expense)	(49,149)	20,543
Deferred tax benefit (expense), other-than-temporary impairment	115	(135)
Total URA(D) on securities arising during the period	483,817	(228,160)
Amortized Cost [Member] | Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	534,410	(247,497)
Amortized Cost [Member] | Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (1,559)	$ (1,071)

Investments (Summary Of Aggrega

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 1,730,364	$ 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(26,793)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,909,627	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(94,376)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,639,991	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(121,169)	(367,898)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	85,527	76,226
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,005)	(158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	249,371	777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,209)	(14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	334,898	853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,214)	(15,101)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	4,600	71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(38)	(1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	5,522	38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(51)	(1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	10,122	109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(89)	(2,839)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	547,120	2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(9,877)	(69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	395,369	1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(27,890)	(71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	942,489	4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(37,767)	(141,515)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	176,222	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,027)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	94,190	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(831)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	270,412	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,858)	(5,492)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	83,127	71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(689)	(1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	23,063	154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(560)	(4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	106,190	225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,249)	(5,340)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	344,267	156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,834)	(975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	488,680	1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,045)	(42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	832,947	1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(10,879)	(43,821)
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	332	10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation		(26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,976
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(20)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,308	10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(20)	(26)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	210,766	196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(4,770)	(9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	283,648	494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(28,743)	(46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	494,414	690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(33,513)	(55,906)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	278,403	939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(7,553)	(35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	365,808	782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(26,027)	(62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	644,211	1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (33,580)	$ (97,858)

Investments (Summary Of Aggre_2

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 1,730,364	$ 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(26,793)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,909,627	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(94,376)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,639,991	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(121,169)	(367,898)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	67,879	454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,237)	(2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	416,583	427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(23,004)	(20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	484,462	881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(24,241)	(23,233)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	464,753	2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(7,960)	(45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	689,195	2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(38,138)	(129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,153,948	4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(46,098)	(175,088)
Due In Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	495,741	1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(12,388)	(51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	103,612	492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,100)	(34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	599,353	1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(23,488)	(85,510)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	98,043	245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,658)	(16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	90,328	91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,678)	(12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	188,371	336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(13,336)	(29,388)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	176,222	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,027)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	94,190	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(831)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	270,412	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,858)	(5,492)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	427,726	238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(2,523)	(2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	515,719	1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,625)	(47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	943,445	1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (12,148)	$ (49,187)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 677,347	$ 615,802	$ 559,773
Funds held interest income (expense)	13,271	6,300	11,874
Future policy benefit reserve income (expense)	(1,380)	(1,419)	(1,282)
Gross investment income	689,238	620,683	570,365
Investment expenses	(42,099)	(39,500)	(27,467)
Net investment income	647,139	581,183	542,898
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	520,291	465,793	427,379
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	19,505	25,327	34,523
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	17,619	14,395	4,177
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	105,815	93,327	83,569
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 14,117	$ 16,960	$ 10,125

Investments (Summary Of Compo_2

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									$ (20,899)	$ (8,110)	$ (7,093)
Total net realized capital gains (losses)	$ 75,443	$ (12,943)	$ 30,272	$ 92,232	$ (172,815)	$ 54,804	$ 15,776	$ (24,901)	185,004	(127,136)	153,194
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									(20,899)	(8,110)	(7,093)
Gains (losses) from sales									28,025	(21,719)	17,714
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									355	(1,799)
Gains (losses) from fair value adjustments									1,808	1,506
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales											(3,424)
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									4,148	(29,941)	6,969
Gains (losses) from fair value adjustments									165,200	(68,832)	138,973
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									6,003	1,815	61
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									$ 364	$ (56)	$ (6)

Investments (Summary Of Gross G

Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 3,283,154	$ 3,150,179	$ 2,401,844
Gross gains from sales	63,721	33,996	58,589
Gross losses from sales	(35,341)	(57,514)	(40,875)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	283,965	1,199,409	651,433
Gross gains from sales	14,274	31,718	24,809
Gross losses from sales	$ (10,126)	$ (61,659)	$ (21,264)

Reserve For Losses, LAE And F_3

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Item	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2015USD ($)	Dec. 20, 2019USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses	$ 4,986,456	$ 5,264,327	$ 4,815,967
Increase (decrease) in insurance business	(63,558)	387,076	(293,386)
Reinsurance recoverable for paid and unpaid losses	1,763,471	1,787,648
Partially offset, related to development on reserves	$ 415,585	174,121
Contracts of insurance and reinsurance received claims during the past three years, in years	20 years
Business acquisition, cost of acquired entity and operations, cash paid				$ 140,279
Liabilites retroceded, percentage				100.00%
Maximum liability retroceded				$ 440,279	$ 450,298
Decrease in amount of liabliities retroceded	$ 43,362
Total amount of liabilities retroceded				$ 300,000
Number of exposure groupings | Item	200
Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Concentration risk, percentage	5.00%
Property and Short-Tail Business [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business			(238,378)
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business	$ (693,458)	$ 561,197
Workers Compensation [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business			55,007
Mt Logan Re [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance recoverable for paid and unpaid losses	$ 682,845
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Concentration risk, percentage	38.70%
Zurich Vericherungs Gesellschaft [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance recoverable for paid and unpaid losses	$ 95,481
Zurich Vericherungs Gesellschaft [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Concentration risk, percentage	5.40%
Munich Reinsurance Company [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance recoverable for paid and unpaid losses	$ 147,807
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Concentration risk, percentage	8.40%
A And E [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Partially offset, related to development on reserves			$ 37,137

Reserve For Losses, LAE And F_4

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves beginning of period	$ 13,119,090	$ 11,884,321	$ 10,312,313
Less reinsurance recoverables	(1,619,641)	(1,212,649)	(990,862)
Net reserves beginning of period	11,499,449	10,671,672	9,321,451
Incurred related to: Current year	4,986,456	5,264,327	4,815,967
Incurred related to: Prior years	(63,558)	387,076	(293,386)
Total incurred losses and LAE	4,922,898	5,651,403	4,522,581
Paid related to: Current year	2,042,246	1,700,765	1,280,605
Paid related to: Prior years	2,460,825	3,011,175	2,062,634
Total paid losses and LAE	4,503,071	4,711,940	3,343,239
Foreign exchange/translation adjustment	51,325	(111,686)	170,879
Net reserves end of period	11,970,601	11,499,449	10,671,672
Plus reinsurance recoverables	1,640,712	1,619,641	1,212,649
Gross reserves end of period	$ 13,611,313	$ 13,119,090	$ 11,884,321

Reserve For Losses, LAE And F_5

Reserve For Losses, LAE And Future Policy Benefit Reserve (Ultimate Loss and ALAE And Paid Loss And ALAE, Net Of Reinsurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims Development [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 11,768,596
United States Reinsurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	3,281,926
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,692,901
All outstanding liabilities prior to 2012, net of reinsurance	607,385
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,196,410
United States Reinsurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	312,483	$ 324,139	$ 320,958	$ 321,099	$ 325,134	$ 329,084	$ 395,794	$ 401,018
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,539
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	286,409	272,046	218,653	187,286	143,510	82,995	38,496	9,986
United States Reinsurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	355,118	362,781	372,409	388,287	385,643	388,323	310,935
Total of IBNR Liabilities Plus Expected Development on Reported Claims	3,851
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	310,168	285,756	211,273	170,868	108,801	48,929	14,842
United States Reinsurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	351,033	357,608	375,404	392,379	383,657	367,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,232
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	294,533	254,077	164,552	110,249	54,255	18,809
United States Reinsurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	337,332	350,790	352,983	354,265	326,346
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,184
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	257,511	206,397	107,458	53,621	19,902
United States Reinsurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	343,004	355,804	354,822	330,362
Total of IBNR Liabilities Plus Expected Development on Reported Claims	56,353
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	193,804	137,219	58,310	18,927
United States Reinsurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	342,896	347,147	346,836
Total of IBNR Liabilities Plus Expected Development on Reported Claims	105,550
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	142,335	73,023	25,800
United States Reinsurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	472,532	484,218
Total of IBNR Liabilities Plus Expected Development on Reported Claims	259,800
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	104,690	63,140
United States Reinsurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	767,529
Total of IBNR Liabilities Plus Expected Development on Reported Claims	488,182
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	103,453
United States Reinsurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	7,421,556
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	5,878,758
All outstanding liabilities prior to 2012, net of reinsurance	29,929
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,572,727
United States Reinsurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	694,576	692,079	706,782	713,237	715,961	723,151	723,851	937,720
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,112
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	666,768	651,550	646,572	621,013	598,289	520,244	402,305	242,315
United States Reinsurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	310,199	308,557	310,942	314,637	352,687	405,338	622,108
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,099
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	302,756	300,708	296,074	289,130	269,014	250,850	234,464
United States Reinsurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	397,683	396,641	402,129	437,409	516,189	603,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,674
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	375,988	373,060	362,825	338,030	289,430	189,598
United States Reinsurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	456,195	451,694	476,348	534,178	673,913
Total of IBNR Liabilities Plus Expected Development on Reported Claims	5,655
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	419,757	405,614	378,235	320,310	225,655
United States Reinsurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	788,551	797,339	816,765	972,881
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,293
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	735,678	681,502	582,985	291,462
United States Reinsurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,231,384	2,117,747	1,564,165
Total of IBNR Liabilities Plus Expected Development on Reported Claims	16,538
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,744,822	1,422,328	545,551
United States Reinsurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,572,138	1,728,705
Total of IBNR Liabilities Plus Expected Development on Reported Claims	88,063
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,064,431	409,225
United States Reinsurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	970,831
Total of IBNR Liabilities Plus Expected Development on Reported Claims	329,576
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	568,556
International [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,496,922
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	694,615
All outstanding liabilities prior to 2012, net of reinsurance	116,104
Liabilities for claims and claim adjustment expenses, net of reinsurance	918,411
International [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	101,872	116,283	118,941	117,350	135,230	135,234	146,421	224,614
Total of IBNR Liabilities Plus Expected Development on Reported Claims	6,225
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	88,278	83,253	76,921	66,234	56,420	46,015	30,090	18,875
International [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	130,124	138,355	141,645	144,869	164,973	168,277	184,497
Total of IBNR Liabilities Plus Expected Development on Reported Claims	13,641
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	95,799	86,851	75,964	67,605	54,619	41,481	17,865
International [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	158,117	166,605	166,576	168,865	187,451	195,753
Total of IBNR Liabilities Plus Expected Development on Reported Claims	27,302
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	99,522	86,607	73,955	62,508	44,805	25,910
International [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	167,290	172,061	172,811	179,392	193,714
Total of IBNR Liabilities Plus Expected Development on Reported Claims	30,299
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	96,180	82,465	69,674	48,806	24,237
International [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	178,255	177,979	180,284	184,267
Total of IBNR Liabilities Plus Expected Development on Reported Claims	46,648
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	87,191	70,108	50,824	26,446
International [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	150,276	139,214	191,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	48,308
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	77,614	52,774	26,541
International [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	319,752	309,673
Total of IBNR Liabilities Plus Expected Development on Reported Claims	148,582
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	97,222	57,962
International [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	291,237
Total of IBNR Liabilities Plus Expected Development on Reported Claims	189,506
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	52,808
International [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	4,581,301
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	3,209,811
All outstanding liabilities prior to 2012, net of reinsurance	54,040
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,425,530
International [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	358,428	344,626	340,618	342,251	346,116	338,496	397,747	437,946
Total of IBNR Liabilities Plus Expected Development on Reported Claims	754
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	355,887	324,936	319,112	311,706	303,002	279,611	230,203	126,001
International [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	369,876	362,370	365,106	366,182	374,216	413,959	473,767
Total of IBNR Liabilities Plus Expected Development on Reported Claims	920
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	354,102	341,831	337,087	325,155	294,024	246,893	121,461
International [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	446,412	445,914	443,210	497,317	541,484	589,489
Total of IBNR Liabilities Plus Expected Development on Reported Claims	3,613
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	416,735	410,715	392,731	360,679	295,731	162,647
International [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	385,980	384,816	388,795	393,027	545,360
Total of IBNR Liabilities Plus Expected Development on Reported Claims	4,466
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	345,693	334,271	299,773	235,921	127,511
International [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	595,512	593,567	543,428	539,447
Total of IBNR Liabilities Plus Expected Development on Reported Claims	15,930
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	481,029	447,094	316,190	159,425
International [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	970,874	954,835	857,100
Total of IBNR Liabilities Plus Expected Development on Reported Claims	15,997
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	773,790	641,832	247,895
International [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	574,521	544,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	84,717
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	330,681	90,429
International [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	879,698
Total of IBNR Liabilities Plus Expected Development on Reported Claims	389,242
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	151,893
Bermuda Segment [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,945,212
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	991,242
All outstanding liabilities prior to 2012, net of reinsurance	356,351
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,310,321
Bermuda Segment [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	241,631	241,312	237,315	236,883	230,441	240,949	262,122	284,509
Total of IBNR Liabilities Plus Expected Development on Reported Claims	30,273
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	164,775	149,629	130,159	102,019	75,680	51,278	29,660	12,864
Bermuda Segment [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	230,654	234,668	250,627	261,259	252,704	258,432	228,258
Total of IBNR Liabilities Plus Expected Development on Reported Claims	33,689
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	144,010	124,708	102,866	77,270	52,270	33,951	16,996
Bermuda Segment [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	226,434	234,196	257,904	261,523	244,163	211,439
Total of IBNR Liabilities Plus Expected Development on Reported Claims	48,168
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	115,098	91,981	67,716	42,872	24,915	13,580
Bermuda Segment [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	309,983	308,042	307,957	301,791	273,468
Total of IBNR Liabilities Plus Expected Development on Reported Claims	82,925
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	153,080	127,930	93,220	58,956	13,643
Bermuda Segment [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	357,169	349,522	351,182	292,353
Total of IBNR Liabilities Plus Expected Development on Reported Claims	114,651
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	155,397	121,553	84,152	45,671
Bermuda Segment [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	365,823	365,767	354,391
Total of IBNR Liabilities Plus Expected Development on Reported Claims	181,139
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	103,915	64,197	29,904
Bermuda Segment [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	546,367	547,267
Total of IBNR Liabilities Plus Expected Development on Reported Claims	376,744
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	93,727	36,678
Bermuda Segment [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	667,150
Total of IBNR Liabilities Plus Expected Development on Reported Claims	551,529
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	61,239
Bermuda Segment [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,787,971
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,150,003
All outstanding liabilities prior to 2012, net of reinsurance	26,236
Liabilities for claims and claim adjustment expenses, net of reinsurance	664,204
Bermuda Segment [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	120,824	117,734	118,999	117,909	117,221	119,168	180,775	238,152
Total of IBNR Liabilities Plus Expected Development on Reported Claims	593
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	116,429	113,816	113,508	111,772	108,172	90,147	85,175	45,573
Bermuda Segment [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	112,900	114,800	114,252	115,029	124,191	142,666	217,531
Total of IBNR Liabilities Plus Expected Development on Reported Claims	272
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	111,833	111,655	110,378	108,535	101,614	64,560	34,745
Bermuda Segment [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	136,813	137,389	134,776	138,381	164,139	186,492
Total of IBNR Liabilities Plus Expected Development on Reported Claims	1,092
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	131,455	129,891	126,552	106,564	86,611	32,813
Bermuda Segment [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	143,266	146,196	143,625	157,711	192,520
Total of IBNR Liabilities Plus Expected Development on Reported Claims	2,204
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	134,862	131,387	109,401	73,041	33,814
Bermuda Segment [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	187,607	186,735	181,593	206,279
Total of IBNR Liabilities Plus Expected Development on Reported Claims	4,619
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	167,562	130,319	78,499	26,737
Bermuda Segment [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	346,472	365,405	393,969
Total of IBNR Liabilities Plus Expected Development on Reported Claims	10,115
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	250,661	137,127	38,106
Bermuda Segment [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	396,488	394,542
Total of IBNR Liabilities Plus Expected Development on Reported Claims	85,786
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	170,831	72,580
Bermuda Segment [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	343,602
Total of IBNR Liabilities Plus Expected Development on Reported Claims	184,640
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	66,370
Insurance [Member] | Casualty Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	4,370,593
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	2,193,224
All outstanding liabilities prior to 2012, net of reinsurance	300,347
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,477,716
Insurance [Member] | Casualty Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	351,320	346,882	343,931	353,320	348,180	346,953	351,402	349,597
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 20,199
Cumulative Number of Reported Claims	15,769
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 306,833	294,380	272,055	246,407	213,451	157,897	101,288	33,185
Insurance [Member] | Casualty Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	350,815	344,388	351,295	393,035	392,827	393,390	393,539
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 23,120
Cumulative Number of Reported Claims	21,350
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 303,726	285,822	260,184	224,611	176,312	117,037	33,311
Insurance [Member] | Casualty Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	397,834	397,061	460,642	454,576	457,043	431,068
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 38,872
Cumulative Number of Reported Claims	25,188
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 325,856	297,644	256,807	201,646	124,915	41,190
Insurance [Member] | Casualty Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	468,584	542,176	535,671	528,050	519,509
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 54,740
Cumulative Number of Reported Claims	26,896
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 353,232	291,943	218,853	134,730	44,311
Insurance [Member] | Casualty Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	615,168	580,323	551,321	553,437
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 166,117
Cumulative Number of Reported Claims	31,517
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 342,325	268,909	164,225	54,731
Insurance [Member] | Casualty Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	625,039	602,985	612,967
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 226,898
Cumulative Number of Reported Claims	34,701
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 280,797	172,200	53,898
Insurance [Member] | Casualty Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	711,001	705,789
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 353,806
Cumulative Number of Reported Claims	33,817
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 208,081	63,492
Insurance [Member] | Casualty Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	850,832
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 653,255
Cumulative Number of Reported Claims	30,144
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 72,375
Insurance [Member] | Property Business [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,975,961
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	1,773,329
All outstanding liabilities prior to 2012, net of reinsurance	644
Liabilities for claims and claim adjustment expenses, net of reinsurance	203,277
Insurance [Member] | Property Business [Member] | 2012 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	82,526	81,979	81,802	82,019	82,448	81,747	89,000	106,325
Total of IBNR Liabilities Plus Expected Development on Reported Claims	68
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	82,457	81,820	81,682	81,891	81,749	80,469	81,772	$ 56,504
Insurance [Member] | Property Business [Member] | 2013 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	92,246	92,393	92,233	92,144	91,251	98,106	112,037
Total of IBNR Liabilities Plus Expected Development on Reported Claims	471
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	91,777	91,759	91,720	92,110	91,841	93,110	$ 68,695
Insurance [Member] | Property Business [Member] | 2014 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	119,413	119,282	119,464	119,928	123,668	131,679
Total of IBNR Liabilities Plus Expected Development on Reported Claims	407
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	118,660	118,545	118,211	118,220	116,037	$ 81,827
Insurance [Member] | Property Business [Member] | 2015 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	144,769	146,780	143,944	152,895	172,904
Total of IBNR Liabilities Plus Expected Development on Reported Claims	405
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	146,719	145,225	142,437	141,280	$ 102,170
Insurance [Member] | Property Business [Member] | 2016 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	291,672	280,170	275,154	290,264
Total of IBNR Liabilities Plus Expected Development on Reported Claims	736
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	289,194	271,938	249,517	$ 162,548
Insurance [Member] | Property Business [Member] | 2017 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	494,844	501,407	496,905
Total of IBNR Liabilities Plus Expected Development on Reported Claims	13,043
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	458,811	424,181	$ 178,666
Insurance [Member] | Property Business [Member] | 2018 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	401,900	407,855
Total of IBNR Liabilities Plus Expected Development on Reported Claims	14,862
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	358,324	$ 244,772
Insurance [Member] | Property Business [Member] | 2019 [Member]
Claims Development [Line Items]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	348,590
Total of IBNR Liabilities Plus Expected Development on Reported Claims	81,655
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 227,387

Reserve For Losses, LAE And F_6

Reserve For Losses, LAE And Future Policy Benefit Reserve (Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance) (Details)	Dec. 31, 2019
U.S. Reinsurance [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	8.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	10.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	17.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	19.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	16.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	14.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	11.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	4.60%
U.S. Reinsurance [Member] | Property Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	36.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	34.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	13.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	7.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	2.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	0.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	2.20%
International [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	16.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	13.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	12.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	8.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	8.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	6.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	4.90%
International [Member] | Property Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	25.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	34.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	15.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	7.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	3.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	1.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	2.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	8.60%
Bermuda [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	7.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	9.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	9.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	10.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	10.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	10.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	8.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	6.30%
Bermuda [Member] | Property Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	19.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	28.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	25.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	14.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	2.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	1.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	2.20%
Insurance [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	9.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	19.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	17.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	14.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	10.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	7.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	6.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	3.30%
Insurance [Member] | Property Business [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	56.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	35.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	4.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	0.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	0.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Seven	0.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Eight	0.00%

Reserve For Losses, LAE And F_7

Reserve For Losses, LAE And Future Policy Benefit Reserve (Reconciliation of the Net Incurred and Paid Claims Development) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 11,768,596
Total reinsurance recoverable on unpaid claims	1,640,712
Unallocated claims adjustment expenses	163,563
Other	38,442
Total expenses	202,005
Total gross liability for unpaid claims and claim adjustment expense	13,611,313	$ 13,119,090	$ 11,884,321	$ 10,312,313
U.S. Reinsurance [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,196,410
Total reinsurance recoverable on unpaid claims	363,925
U.S. Reinsurance [Member] | Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,572,727
Total reinsurance recoverable on unpaid claims	207,967
International [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	918,411
Total reinsurance recoverable on unpaid claims	91,193
International [Member] | Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	1,425,530
Total reinsurance recoverable on unpaid claims	149,803
Bermuda [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,310,321
Total reinsurance recoverable on unpaid claims	9,975
Bermuda [Member] | Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	664,204
Total reinsurance recoverable on unpaid claims	68,639
Insurance [Member] | Casualty Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	2,477,716
Total reinsurance recoverable on unpaid claims	631,827
Insurance [Member] | Property Business [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	203,277
Total reinsurance recoverable on unpaid claims	$ 117,382

Reserve For Losses, LAE And F_8

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Incurred Losses With Respect To A&E Reserve On Both Gross And Net Of Reinsurance Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 347,495	$ 448,994	$ 441,111
Gross basis: Incurred losses	2,070	(2,473)	90,009
Gross basis: Paid losses	(91,644)	(99,026)	(82,126)
Gross basis: End of period reserves	257,921	347,495	448,994
Net basis: Beginning of period reserves	261,456	318,081	319,072
Net basis: Incurred losses			37,137
Net basis: Paid losses	(32,756)	(56,624)	(38,128)
Net basis: End of period reserves	$ 228,701	$ 261,456	$ 318,081

Reserve For Losses, LAE And F_9

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Future Policy Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Balance at beginning of year	$ 46,778	$ 51,014	$ 55,074
Liabilities assumed	53	110	115
Adjustments to reserves	350	806	(437)
Benefits paid in the current year	(4,589)	(5,151)	(3,738)
Balance at end of year	$ 42,592	$ 46,778	$ 51,014

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019USD ($)Item	Dec. 31, 2018USD ($)	Dec. 31, 2005Item	Dec. 31, 2001Item
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio	$ 170,888,000	$ 124,228,000
Number of equity index put option contracts | Item	4		7	7
Derivatives, number of indices | Item			2	2
Equity index put option contracts	$ 5,584,000	11,958,000
Other invested assets	612,997,000	358,042,000
Transfers between level 1 and 2	0
Transfers from level 3	4,695,000	2,942,000
Settlement amount if contracts had expired	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity index put option contracts	$ 5,584,000	11,958,000
Standard & Poor's Five Hundred Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | Item	2
Theoretical maximum payout occurs based on index value	$ 0
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	0.40%
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 208,359,000
Settlement amount if contracts had expired	0
Equity Index	$ 3,230.78
FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | Item	1
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	4.00%
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 42,899,000
Equity Index	7,542.44
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from level 3
Fair Value [Member] | Amortized Cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	209,578,000	117,662,000
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	772,979,000	435,959,000
Fixed Maturities [Member] | Investment Manager's Valuation Committee Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	610,873,000	354,143,000
Fixed Maturities [Member] | Non-Binding Broker Quote [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities		1,153,000
Fixed Maturities [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	5,826,000	2,337,000
Fixed Maturities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	162,106,000
Fixed Maturities [Member] | Fair Value [Member] | Investment Manager's Valuation Committee Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	$ 5,826,000	2,337,000
Fixed Maturities [Member] | Par Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities		$ 80,663,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 16,824,944	$ 15,225,263
Fixed maturities, fair value	5,826	2,337
Equity securities, fair value	931,457	716,639
Equity index put option contracts	5,584	11,958
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value
Equity securities, fair value	864,584	674,433
Equity index put option contracts
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value
Equity securities, fair value	66,873	42,206
Equity index put option contracts
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value	5,826	2,337
Equity securities, fair value
Equity index put option contracts	5,584	11,958
Fixed Maturity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	16,824,944	15,225,263
Fixed Maturity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Fixed Maturity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	16,051,965	14,789,304
Fixed Maturity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	772,979	435,959
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,515,803	2,631,134
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,515,803	2,631,134
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Obligations Of U.S. States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	536,915	500,094
Obligations Of U.S. States And Political Subdivisions [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	536,915	500,094
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	6,374,946	5,445,532
Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	5,757,358	5,017,317
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	617,588	428,215
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	897,333	540,097
Asset-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	743,692	540,097
Asset-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	153,641
Commercial Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	844,557	326,710
Commercial Mortgage-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Commercial Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	844,557	326,710
Commercial Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,198,581	1,796,264
Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,198,581	1,796,264
Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Non-Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	5,703	10,209
Non-Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Non-Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	5,703	10,209
Non-Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Government Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,505,950	1,314,165
Foreign Government Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,505,950	1,314,165
Foreign Government Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,945,156	2,661,058
Foreign Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,943,406	2,653,314
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 1,750	$ 7,744

Fair Value (Activity Under Leve

Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers in and/or (out) of Level 3			$ 4,695	$ 2,942
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities			435,959	217,138
Total gains or (losses) (realized/unrealized) Included in earnings			4,925	(752)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)			3,502	1,091
Purchases, issuances and settlements			323,898	215,540
Transfers in and/or (out) of Level 3			4,695	2,942
Ending balance			772,979	435,959
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities			428,215	210,186
Total gains or (losses) (realized/unrealized) Included in earnings			4,937	(92)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)			(20)	1,091
Purchases, issuances and settlements			179,761	215,838
Transfers in and/or (out) of Level 3			4,695	1,192
Ending balance			617,588	428,215
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities
Total gains or (losses) (realized/unrealized) Included in earnings
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)			3,632
Purchases, issuances and settlements			150,009
Transfers in and/or (out) of Level 3
Ending balance			153,641
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities			7,744	6,952
Total gains or (losses) (realized/unrealized) Included in earnings			(12)	(660)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)			(110)
Purchases, issuances and settlements			(5,872)	(298)
Transfers in and/or (out) of Level 3				1,750
Ending balance			1,750	7,744
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities			2,337
Total gains or (losses) (realized/unrealized) Included in earnings			2,163	(293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements			1,326	2,630
Transfers in and/or (out) of Level 3
Ending balance			5,826	2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date			1,795
Fair Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities			2,337
Total gains or (losses) (realized/unrealized) Included in earnings			2,163	(293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements			1,326	2,630
Transfers in and/or (out) of Level 3
Ending balance			5,826	2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date			$ 1,795

Fair Value (Fair Value Measur_2

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Fair Value [Abstract]
Balance, beginning of period			$ 11,958	$ 12,477
Total (gains) or losses (realized/unrealized) Included in earnings			(6,374)	(520)
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)
Transfers in and/or (out) of Level 3
Purchases, issuances and settlements
Balance, end of period			$ 5,584	$ 11,958
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date

Credit Facilities (Narrative) (

Credit Facilities (Narrative) (Details)	Nov. 07, 2019GBP (£)	May 26, 2016USD ($)	Jun. 22, 2012USD ($)	Dec. 31, 2019GBP (£)ItemRate	Dec. 31, 2018GBP (£)	Dec. 31, 2019USD ($)ItemRate	Dec. 31, 2018USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | Item				2
Line of credit facility, commitment				£ 47,000,000		$ 1,000,000,000
Maximum percentage of admitted assets allowed for borrowing base				10.00%		10.00%
Admitted assets for FHLB						$ 12,518,844,000
Borrowings from FHLB						0
Maximum amount available under FHLB						1,251,884,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility		5 years	4 years
Line of credit facility, commitment		$ 800,000,000	$ 800,000,000			$ 800,000,000	$ 800,000,000
Line of credit facility, number of tranches | Item				2		2
Line of credit facility, required minimum debt-to-capital ratio | Rate				35.00%		35.00%
Line of credit facility, required minimum net worth						$ 5,370,979,000
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants				25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants				25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants						6,256,094,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2020
Line of credit facility, commitment						200,000,000	200,000,000
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis				0.50%
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis				1.00%
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date					Dec. 31, 2019
Line of credit facility, commitment						600,000,000	600,000,000
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment						$ 200,000,000	$ 200,000,000
Percentage of interest on the principal amount of letters of credit issued				0.35%
Percentage of interest on the principal amount of issued extended tenor letters of credit				0.45%
Maximum term allowed to execute issued letters of credit				60 months
Per annum commitment fee on undrawn credit				0.15%
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	4 years
Line of credit facility, commitment | £	£ 47,000,000			£ 47,000,000	£ 30,000,000
Line of credit facility, required minimum debt-to-capital ratio				0.35		0.35
Line of credit facility, required minimum net worth						$ 5,326,009,000
Consolidated net worth, percentage				70.00%
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants				25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants				25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants						$ 6,246,842,000
Percentage commitment fee per annum				0.10%
Per annum commitment fee on undrawn credit				0.35%

Credit Facilities (Summary Of C

Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Credit Facilities [Abstract]
Credit facility interest and fees incurred	$ 420	$ 420	$ 420

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And Borrowings) (Details)	12 Months Ended
	Dec. 31, 2019GBP (£)	Dec. 31, 2018GBP (£)	Dec. 31, 2019USD ($)	Nov. 07, 2019GBP (£)	Dec. 31, 2018USD ($)	May 26, 2016USD ($)	Jun. 22, 2012USD ($)
Line of Credit Facility [Line Items]
Commitment	£ 47,000,000		$ 1,000,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000,000		$ 800,000,000	$ 800,000,000	$ 800,000,000
In Use			623,484,000		558,818,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000		200,000,000
In Use			33,737,000
Date of Expiry	Dec. 31, 2020
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Debt Instrument Redemption Period One [Member]
Line of Credit Facility [Line Items]
In Use
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000		600,000,000
In Use					558,818,000
Date of Expiry		Dec. 31, 2019
Wells Fargo Bank Group Credit Facility Tranche Two [Member] | Debt Instrument Redemption Period One [Member]
Line of Credit Facility [Line Items]
In Use			2,381,000
Date of Expiry	Jul. 29, 2020
Wells Fargo Bank Group Credit Facility Tranche Two [Member] | Debt Instrument Redemption Period Two [Member]
Line of Credit Facility [Line Items]
In Use			1,649,000
Date of Expiry	Sep. 30, 2020
Wells Fargo Bank Group Credit Facility Tranche Two [Member] | Debt Instrument Redemption Period Three [Member]
Line of Credit Facility [Line Items]
In Use			573,353,000
Date of Expiry	Dec. 31, 2020
Wells Fargo Bank Group Credit Facility Tranche Two [Member] | Debt Instrument Redemption Period Four [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000
In Use			12,364,000
Date of Expiry	Jan. 4, 2021
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000		200,000,000
In Use			147,970,000		141,746,000
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000		200,000,000
In Use			4,425,000		3,482,000
Date of Expiry	Feb. 29, 2020	Feb. 28, 2019
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			512,000		3,672,000
Date of Expiry	Sep. 3, 2020	Nov. 24, 2019
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			3,672,000		72,443,000
Date of Expiry	Nov. 24, 2020	Dec. 31, 2019
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			177,000		296,000
Date of Expiry	Dec. 16, 2020	Aug. 15, 2020
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			125,000		177,000
Date of Expiry	Dec. 20, 2020	Dec. 16, 2020
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			101,404,000		125,000
Date of Expiry	Dec. 31, 2020	Dec. 20, 2020
Citibank Bilateral Letter Of Credit Agreement Seven [Member]
Line of Credit Facility [Line Items]
In Use			559,000		1,851,000
Date of Expiry	Aug. 15, 2021	Nov. 4, 2022
Citibank Bilateral Letter Of Credit Agreement Eight [Member]
Line of Credit Facility [Line Items]
In Use			37,096,000		407,000
Date of Expiry	Dec. 30, 2023	Nov. 13, 2022
Citibank Bilateral Letter Of Credit Agreement Nine [Member]
Line of Credit Facility [Line Items]
In Use					$ 59,293,000
Date of Expiry		Dec. 30, 2022
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 47,000,000	£ 30,000,000		£ 47,000,000
In Use | £	47,000,000	26,000,000
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £
In Use | £
Lloyd S Bank Plc [Member]
Line of Credit Facility [Line Items]
Commitment | £	47,000,000	30,000,000
In Use | £	£ 47,000,000	£ 26,000,000
Date of Expiry	Dec. 31, 2023	Dec. 31, 2022

Senior Notes (Narrative) (Detai

Senior Notes (Narrative) (Details) - Senior Notes [Member] - 4.868% Senior notes due 6/1/2044 [Member]	12 Months Ended
	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Date issued	Jun. 5, 2014
Debt instrument face amount	$ 400,000,000
Debt instrument, term	30 years
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 1, 2044

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Consolidated Balance Sheet Amount	$ 397,074,000	$ 396,954,000
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044
Principal Amounts	$ 400,000,000
Consolidated Balance Sheet Amount	397,074,000	396,954,000
Market Value	$ 452,848,000	$ 396,968,000

Senior Notes (Schedule Of Inter

Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Senior Notes [Abstract]
Interest expense incurred	$ 19,472	$ 19,472	$ 19,472

Long Term Subordinated Notes (N

Long Term Subordinated Notes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Feb. 17, 2020
Debt Instrument [Line Items]
Redemption date	May 1, 2047
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption	100.00%
Outstanding debt reduction	$ 161,441
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%
Debt instrument, maturity date	May 1, 2067
Interest payment commencement date	Nov. 15, 2007
Reset quarterly interest rate		4.30%
Basis spread on variable rate	2.385%
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
Senior Notes [Member] | 5.4% Senior notes due 10/15/2014 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.40%
Debt instrument, maturity date	Oct. 15, 2014
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 1, 2044

Long Term Subordinated Notes (S

Long Term Subordinated Notes (Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 236,758	$ 236,659
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Date Issued	Apr. 26, 2007
Principal Amounts	$ 400,000
Maturity Date	May 1, 2067
Consolidated balance sheet amount	$ 236,758	236,659
Market Value	$ 233,191	$ 200,390
Scheduled [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037
Final [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 1, 2067

Long Term Subordinated Notes _2

Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long Term Subordinated Notes [Abstract]
Interest expense incurred	$ 11,587	$ 10,926	$ 11,498

Collateralized Reinsurance An_3

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands	Dec. 12, 2019USD ($)Item	Apr. 30, 2018USD ($)Item	Apr. 01, 2018USD ($)	Apr. 13, 2017USD ($)Item	Dec. 01, 2015USD ($)Item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)Item	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts								$ 989,693
Preferred shares
Reinsurance coverage amount								$ 1,308,940	1,060,726	$ 929,261
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item	4	4		6	2		2
Reinsurance coverage amount						$ 500,000
Reinsurance agreements expiration date						Nov. 30, 2019	Apr. 30, 2018
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 And 2 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item	2	2
Reinsurance contract term	4 years	4 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 Through 3 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item				3
Reinsurance contract term				4 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 And 4 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item	2	2
Reinsurance contract term	5 years	5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 Through 6 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item				3
Reinsurance contract term				5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 150,000	$ 62,500		$ 225,000	$ 300,000		$ 250,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	275,000	200,000		400,000	325,000		200,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	150,000	62,500		325,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	275,000	200,000		50,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 5 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount				75,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 6 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount				175,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount							$ 450,000
Catastrophe Reinsurance Bonds Redeemed Amount		450,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount						$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2015-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount					$ 625,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount				300,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount				$ 950,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount		262,500
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount		$ 262,500
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2019-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	425,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2019-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	$ 425,000
Mt. Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group								100.00%
Assumed net risk exposures								$ 993,036	1,156,853
Preferred shares								$ 46,390	$ 45,625
Retrocede amount			$ 269,198
Cash transferred			$ 252,000
Mt. Logan Re [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
Accident year								2002
Mt. Logan Re [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Accident year								2015
Liability retroceded								$ 319,000

Collateralized Reinsurance An_4

Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 1,308,940	$ 1,060,726	$ 929,261
Assumed written premiums	6,350,328	6,234,203	5,090,367
Mt. Logan Re Segregated Accounts [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums	291,979	260,612	245,453
Ceded earned premiums	294,762	262,518	242,793
Ceded losses and LAE	187,192	319,046	320,315
Assumed written premiums	17,005	11,032	25,970
Assumed earned premiums	17,005	11,032	25,970
Assumed losses and LAE

Leases (Narrative) (Details)

Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Jul. 02, 2019ft²	Dec. 31, 2018USD ($)
Lease [Line Items]
Future minimum rental commitments			$ 91,841
2019			18,992
2020			18,365
2021			9,469
2022			9,180
2023			8,919
Thereafter			$ 26,916
Area of property | ft²		315,000
Annual lease expense	$ 7,800
Monthly lease expense	$ 650
Lease expiration	2036

Leases (Supplemental Informatio

Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Lease expense incurred: Operating lease cost	$ 24,524
Operating lease right of use assets	161,435	$ 69,869
Operating lease liabilities	169,909	$ 77,270
Operating cash flows from operating leases	$ 20,041
Weighted average remaining operating lease term	12 years 7 months 6 days
Weighted average discount rate on operating leases	3.91%

Leases (Maturities of Lease Lia

Leases (Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 19,945
2021	17,153
2022	18,985
2023	18,169
2024	17,872
Thereafter	126,250
Undiscounted lease payments	218,374
Less: present value adjustment	48,465
Total operating lease liability	$ 169,909	$ 77,270

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
U.S. tax rate	21.00%	21.00%	35.00%
Accrual withhilding taxes, percent	5.00%
Unrecognized tax benefits that would impact the effective tax rate
Accrued interest and penalties, net of Federal benefit	0
Accrued interest and penalties	0	$ 0
Deferred tax assets, valuation allowance	12,997,000	9,309,000
Foreign tax credits	186,706,000	167,685,000
US NOL carryforward	$ 19,027,000
NOL carryforward expiration	Dec. 31, 2038
Expense (benefit) from TCJA		(28,411,000)
Minimum [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward expiration	Jan. 1, 2020
Maximum [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward expiration	Dec. 31, 2029
ASU 2016-02 [Member]
Income Tax Contingency [Line Items]
Tax benefits related to restricted stock vestings and stock options exercises	$ 3,357,000	3,453,000	$ 6,951,000
Tax benefits related to payment of dividends on restricted stock	484,000	403,000	626,000
Tax Cut and Jobs Act [Member]
Income Tax Contingency [Line Items]
Income tax expense			8,246,000
Accrual withholding taxes			8,246,000
Her Majestys Revenue And Customs H M R C [Member]
Income Tax Contingency [Line Items]
Foreign NOL carryforward	10,160,000
Canada Revenue Agency [Member]
Income Tax Contingency [Line Items]
Foreign NOL carryforward	$ 2,511,000
NOL carryforward expiration	Dec. 31, 2035
Foreign Country [Member]
Income Tax Contingency [Line Items]
Income tax expense
Additional income tax benefit resulting from correction, amount	2,509,000	3,127,000	2,982,000
IRS audit, additional income tax expense
Deferred tax assets, valuation allowance	12,671,000	$ 9,309,000
Tax Year 2014 [Member]
Income Tax Contingency [Line Items]
Net refund	(34,972,000)
Interest on net refund	2,421,000
Tax Year 2015 [Member]
Income Tax Contingency [Line Items]
Net refund	(1,519,000)
Interest on net refund	978,000
Tax Year 2016 [Member]
Income Tax Contingency [Line Items]
Net refund	(4,685,000)
Interest on net refund	$ 247,000

Income Taxes (Components Of The

Income Taxes (Components Of The Provision) (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
U.S.									$ (5,044)	$ (38,625)	$ (117,173)
Non-U.S.									14,420	6,497	2,849
Total current tax expense (benefit)									9,376	(32,128)	(114,324)
U.S.									80,247	(298,998)	50,207
Non-U.S.									(97)	(97)	777
Total deferred tax expense (benefit)									80,150	(299,095)	50,984
Total income tax expense (benefit)	$ 39,477	$ 59,993	$ (8,910)	$ (9,633)	$ 7,426	$ 99,470	$ (2,207)	$ (11,117)	$ 89,526	$ (331,223)	$ (63,340)

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Underwriting gain (loss)												$ 336,163	$ (610,275)	$ (207,521)
Net investment income	$ 146,077	$ 181,058	$ 179,028	$ 140,976	$ 140,204	$ 161,363	$ 141,322	$ 138,294				647,139	581,183	542,898
Net realized capital gains (losses)	$ 75,443	$ (12,943)	30,272	92,232	$ (172,815)	54,804	15,776	(24,901)				185,004	(127,136)	153,194
Net derivative gain (loss)												6,374	520	9,581
Corporate expenses												(32,966)	(30,672)	(25,923)
Other income (expense)			(18,225)	(3,300)		(13,408)	(6,573)	17,033	$ (21,525)	$ 10,460	$ (2,948)	(11,034)	(24,771)	(21,215)
INCOME (LOSS) BEFORE TAXES			372,345	414,544		189,471	51,154	222,612	786,889	273,766	463,237	1,098,987	(242,182)	419,411
Total income tax expense (benefit)			$ 39,477	$ 59,993		$ (8,910)	$ (9,633)	$ 7,426	$ 99,470	$ (2,207)	$ (11,117)	89,526	(331,223)	(63,340)
Domestic [Member]
Income Taxes [Line Items]
Underwriting gain (loss)												38,964	(1,407,020)	(516,167)
Net investment income												325,179	283,569	255,310
Net realized capital gains (losses)												155,609	(90,033)	148,099
Net derivative gain (loss)
Corporate expenses												(13,063)	(11,035)	(7,394)
Interest, fee and bond issue cost amortization expense												(34,931)	(30,611)	(31,183)
Other income (expense)												(1,976)	(5,894)	32,441
INCOME (LOSS) BEFORE TAXES												469,782	(1,261,024)	(118,894)
Expected tax provision at the applicable statutory rate(s)												98,766	(264,912)	(41,614)
Increase (decrease) in tax resulting from: Tax exempt income												(3,680)	(3,824)	(8,488)
Increase (decrease) in tax resulting from: Dividend received deduction												(998)	(1,520)	(4,639)
Increase (decrease) in tax resulting from: Proration												1,050	1,150	1,760
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends												6,517	6,517	10,861
Increase (decrease) in tax resulting from: Creditable foreign premium tax												(9,852)	(13,475)	(7,515)
Increase (decrease) in tax resulting from: Tax audit settlement												1,576	2,094	11,516
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY													(43,734)
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision													(28,411)
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC												(2,984)	(3,333)	(6,716)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform														8,246
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment														(8,986)
Increase (decrease) in tax resulting from: Change in uncertain tax positions												(8,434)	8,434
Increase (decrease) in taxes resulting from: Other												(3,606)	7,579	1,641
Total income tax expense (benefit)												75,203	(337,623)	(66,966)
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)												297,199	796,745	308,646
Net investment income												321,960	297,614	287,588
Net realized capital gains (losses)												29,394	(37,103)	5,095
Net derivative gain (loss)												6,374	520	9,581
Corporate expenses												(19,903)	(19,637)	(18,529)
Interest, fee and bond issue cost amortization expense												3,239	(420)	(420)
Other income (expense)												(9,057)	(18,877)	(53,656)
INCOME (LOSS) BEFORE TAXES												629,206	1,018,842	538,305
Expected tax provision at the applicable statutory rate(s)												17,205	9,647	6,843
Increase (decrease) in tax resulting from: Tax exempt income
Increase (decrease) in tax resulting from: Dividend received deduction
Increase (decrease) in tax resulting from: Proration
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends
Increase (decrease) in tax resulting from: Creditable foreign premium tax
Increase (decrease) in tax resulting from: Tax audit settlement
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC												(373)	(120)	(235)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment
Increase (decrease) in tax resulting from: Change in uncertain tax positions
Increase (decrease) in taxes resulting from: Other												(2,509)	(3,127)	(2,982)
Total income tax expense (benefit)												$ 14,323	$ 6,400	$ 3,626

Income Taxes (Reconciliation _2

Income Taxes (Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Balance at January 1	$ 8,434
Additions based on tax positions related to the current year
Additions for tax positions of prior years		8,434
Reductions for tax positions of prior years	(8,434)
Settlements with taxing authorities
Lapses of applicable statutes of limitations
Balance at December 31		$ 8,434

Income Taxes (Net Deferred Inco

Income Taxes (Net Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Foreign tax credits	$ 186,706	$ 167,685
Unearned premium reserve	75,130	63,309
Loss reserve	66,025	64,135
Net operating loss carryforward	31,698	106,543
Net unrealized losses on benefit plans	19,818	17,921
Unrealized foreign currency losses	7,964	12,596
Investment impairments	3,961	1,291
Uncollectible reinsurance reserve	3,142	3,142
Other tax credits	2,294
Net unrealized investment losses		10,815
Net fair value losses		7,196
Other assets	13,869	11,521
Total deferred tax assets	410,607	466,154
Deferred acquisition costs	81,931	74,736
Net unrealized investment gains	39,413
Net fair value income	25,936
Partnership investments	15,039	14,936
Benefit plan asset	2,333	3,600
Other liabilities	4,937	3,868
Total deferred tax liabilities	169,589	97,140
Net deferred tax assets	241,018	369,014
Less: Valuation allowance	(12,997)	(9,309)
Total net deferred tax assets	$ 228,021	$ 359,705

Reinsurance (Details)

Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reinsurance [Abstract]
Written premiums: Direct									$ 2,783,036	$ 2,240,951	$ 2,083,555
Written premiums: Assumed									6,350,328	6,234,203	5,090,367
Written premiums: Ceded									(1,308,940)	(1,060,726)	(929,261)
Net written premiums	$ 2,120,186	$ 2,068,557	$ 1,783,983	$ 1,851,698	$ 2,057,071	$ 1,938,773	$ 1,746,378	$ 1,672,206	7,824,424	7,414,428	6,244,661
Premiums earned: Direct									2,551,662	2,129,320	1,825,705
Premiums earned: Assumed									6,059,222	5,807,332	4,945,522
Premiums earned: Ceded									(1,207,198)	(1,004,953)	(833,387)
Net premiums earned	$ 1,948,071	$ 1,905,619	$ 1,817,299	$ 1,732,697	$ 1,850,975	$ 1,731,479	$ 1,729,818	$ 1,619,427	7,403,686	6,931,699	5,937,840
Incurred losses and LAE: Direct									1,618,686	1,372,589	1,311,682
Incurred losses and LAE: Assumed									3,923,298	5,046,947	3,909,816
ncurred losses and LAE: Ceded									(619,086)	(768,133)	(698,917)
Net incurred losses and LAE									$ 4,922,898	$ 5,651,403	$ 4,522,581

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 542,400	$ (329,378)	$ 56,989
Total, Tax Effect	(51,691)	28,913	134
Total, Net of Tax	490,709	(300,465)	57,123
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	547,539	(275,511)	(81,915)
Tax Effect	(49,665)	21,061	(21,597)
Net of Tax	497,874	(254,450)	(60,318)
Reclassification, Before Tax	(13,129)	28,014	(7,258)
Reclassification, Tax Effect	516	(518)	308
Reclassification, Net of Tax	(12,613)	27,496	(6,950)
Total, Net of Tax	485,261	(226,954)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(1,559)	(1,071)	(5,618)
Tax Effect	115	(135)	1,588
Net of Tax	(1,444)	(1,206)	(4,030)
Total, Net of Tax	(1,444)	(1,206)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	18,585	(86,520)	142,054
Tax Effect	(4,555)	9,704	(20,137)
Net of Tax	14,030	(76,816)	121,917
Total, Net of Tax	14,030	(76,816)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(15,938)	(646)	1,300
Tax Effect	3,347	136	(273)
Net of Tax	(12,591)	(510)	1,027
Reclassification, Before Tax	6,902	6,356	8,426
Reclassification, Tax Effect	(1,449)	(1,335)	(2,949)
Reclassification, Net of Tax	5,453	5,021	$ 5,477
Total, Net of Tax	$ (7,138)	$ 4,511

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)			$ (39,477)	$ (59,993)		$ 8,910	$ 9,633	$ (7,426)	$ (99,470)	$ 2,207	$ 11,117	$ (89,526)	$ 331,223	$ 63,340
NET INCOME (LOSS)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	1,009,461	89,041	$ 482,751
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)												(13,129)	28,014
Income tax expense (benefit)												516	(518)
NET INCOME (LOSS)												(12,613)	27,496
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses												6,902	6,356
Income tax expense (benefit)												(1,449)	(1,335)
NET INCOME (LOSS)												$ 5,453	$ 5,021

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 7,860,797	$ 8,340,736
Current period change	490,709	(300,465)	$ 57,123
Balance	9,132,925	7,860,797	8,340,736
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(179,392)	49,969
Current period change	485,261	(226,954)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01			(1,201)
Balance	304,425	(179,392)	49,969
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(1,444)	(1,206)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(215,747)	(138,931)
Current period change	14,030	(76,816)
Balance	(201,717)	(215,747)	(138,931)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(67,418)	(71,929)
Current period change	(7,138)	4,511
Balance	(74,556)	(67,418)	(71,929)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(462,557)	(160,891)	(216,764)
Current period change	490,709	(300,465)	57,123
Change to beginning balance due to adoption of Accounting Standards Update 2016-01			(1,201)	$ (1,250)	$ (1,250)
Balance	$ 28,152	$ (462,557)	$ (160,891)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2029
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan employer contribution percentage for branch offices, minimum	4.90%
Defined contribution plan employer contribution percentage for branch offices, maximum	45.70%
Company contributions	$ 4,750,000	$ 77,743,000	$ 10,534,000
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year	0
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	(9,461,000)
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	0
Pension Plans Defined Benefit [Member] | Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate				4.50%
Defined Benefit Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year	0
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	0
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	$ (577,000)	$ (577,000)	$ (131,000)
Weighted average discount rate used to determine net periodic benefit cost	4.27%	3.62%	4.16%
Rate of compensation increase to determine the net periodic benefit cost	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets	7.00%	7.00%	7.50%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation	3.28%	4.27%	3.62%
Defined contribution plans, employer contribution plans, employer contribution percentage, maximum	3.00%
Defined contribution plans, employer contribution percentage, for new hires, minimum	3.00%
Defined contribution plans, employer contribution percentage, for new hires, maximum	8.00%
Defined Contribution Plan Employer Contribution Percentage Vested After Three Years	100.00%
Healthcare inflation rate	7.00%
Defined Benefit Postretirement Health Coverage [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	62.00%
Defined Benefit Postretirement Health Coverage [Member] | Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	30.00%
Defined Benefit Postretirement Health Coverage [Member] | Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	7.00%
Defined Benefit Postretirement Health Coverage [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	1.00%
Defined Benefit Postretirement Health Coverage [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	70.00%
Defined Benefit Postretirement Health Coverage [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	30.00%
Defined Benefit Postretirement Health Coverage [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Private equity limited partnerships	$ 20,351,000	$ 20,091,000
Company contributions		$ 77,000,000

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary Of Contributions To Defined Benefit Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Company contributions	$ 4,750	$ 77,743	$ 10,534

Employee Benefit Plans (Summa_2

Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4,750	$ 77,743	$ 10,534
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	300,244	316,202
Service cost	8,255	9,801	10,949
Interest cost	11,712	10,290	10,034
Actuarial (gain)/loss	46,206	(29,966)
Curtailment
Benefits paid	(11,062)	(6,084)
Projected benefit obligation at end of year	355,356	300,244	316,202
Fair value of plan assets at beginning of year	260,531	210,267
Actual return on plan assets	47,247	(21,395)
Actual contributions during the year	4,750	77,743
Administrative expenses paid
Benefits paid	(11,062)	(6,084)
Fair value of plan assets at end of year	301,467	260,531	210,267
Funded status at end of year	(53,889)	(39,713)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	28,483	34,717
Service cost	983	1,312	1,570
Interest cost	980	999	1,184
Amendments	(582)
Actuarial (gain)/loss		(7,985)
Benefits paid	(488)	(561)
Projected benefit obligation at end of year	29,376	28,483	34,717
Fair value of plan assets at beginning of year
Actual contributions during the year	488	561
Benefits paid	(488)	(561)
Fair value of plan assets at end of year
Funded status at end of year	$ (29,376)	$ (28,483)

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets (due beyond one year)
Other liabilities (due within one year)	(7,362)	(7,530)
Other liabilities (due beyond one year)	(46,527)	(32,182)
Net amount recognized in the consolidated balance sheets	(53,889)	(39,713)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other liabilities (due within one year)	(611)	(608)
Other liabilities (due beyond one year)	(28,764)	(27,875)
Net amount recognized in the consolidated balance sheets	$ (29,376)	$ (28,483)

Employee Benefit Plans (Amoun_2

Employee Benefit Plans (Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated income (loss)	$ (97,466)	$ (88,580)
Accumulated other comprehensive income (loss)	(97,466)	(88,580)	$ (86,788)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated income (loss)	188	(238)
Accumulated prior service credit (cost)	2,904	3,480
Accumulated other comprehensive income (loss)	$ 3,092	$ 3,242	$ (4,260)

Employee Benefit Plans (Other C

Employee Benefit Plans (Other Changes In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	$ (88,580)	$ (86,788)
Net gain (loss) arising during period	(16,927)	(8,631)
Actuarial loss	8,042	6,839
Curtailment loss recognized
Other comprehensive income (loss) at December 31, current year	(97,466)	(88,580)
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	3,242	(4,260)
Net gain (loss) arising during period	582	7,985
Prior Service credit (cost) arising during period
Actuarial loss	(155)	94
Prior service cost	(577)	(577)
Other comprehensive income (loss) at December 31, current year	$ 3,092	$ 3,242

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,255,000	$ 9,801,000	$ 10,949,000
Interest cost	11,712,000	10,290,000	10,034,000
Prior service credit recognition	0
Expected return on assets	(17,968,000)	(17,202,000)	(13,050,000)
Amortization of actuarial loss from earlier periods	7,635,000	6,839,000	8,366,000
FAS 88 settlement charge	408,000
Net periodic benefit cost	10,042,000	9,728,000	16,299,000
Other comprehensive income (loss) attributable to change from prior year	8,885,000	1,792,000
Total recognized in net periodic benefit cost and other comprehensive income (loss)	18,927,000	11,520,000
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	983,000	1,312,000	1,570,000
Interest cost	980,000	999,000	1,184,000
Prior service credit recognition	(577,000)	(577,000)	(131,000)
Expected return on assets	(155,000)	94,000	192,000
Net periodic benefit cost	1,231,000	1,829,000	$ 2,814,000
Other comprehensive income (loss) attributable to change from prior year	150,000	(7,502,000)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 1,381,000	$ (5,673,000)

Employee Benefit Plans (Summa_3

Employee Benefit Plans (Summary Of Accumulated Benefit Obligation) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 309,970	$ 262,327
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	288,328	237,855
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 21,642	$ 24,472

Employee Benefit Plans (Project

Employee Benefit Plans (Projected Benefit Obligations In Excess Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 333,715	$ 275,772
Fair value of plan assets	301,467	260,531
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	21,642	24,472
Fair value of plan assets

Employee Benefit Plans (Accumul

Employee Benefit Plans (Accumulated Benefit Obligations In Excess Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation
Fair value of plan assets
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	21,642	24,472
Fair value of plan assets

Employee Benefit Plans (Expecte

Employee Benefit Plans (Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
2020	$ 15,670
2021	11,458
2022	12,198
2023	12,902
2024	13,985
Next 5 years	84,334
Defined Benefit Postretirement Health Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
2020	611
2021	673
2022	768
2023	851
2024	896
Next 5 years	$ 6,377

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value Measurement Levels For Qualified Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	$ 1,749	$ 2,872
Total	281,116	240,440
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	90,483	82,633
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	188,884	154,935
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	1,749	2,872
Total	281,116	240,440
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	90,483	82,633
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	188,884	154,935
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value
Total
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Other Observable Inputs (Level 2) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value
Total
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Unobservable Inputs (Level 3) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value

Employee Benefit Plans (Incurre

Employee Benefit Plans (Incurred Expenses Related To Defined Contribution Plans For U.S. Employees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Incurred expenses	$ 10,794	$ 9,301	$ 7,167

Employee Benefit Plans (Incur_2

Employee Benefit Plans (Incurred Expenses Related To Defined Contribution Plans For Non-U.S. Employees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Incurred Expenses	$ 2,216	$ 2,057	$ 1,849

Employee Benefit Plans (Changes

Employee Benefit Plans (Changes In The Assumed Healthcare Cost Trend) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Employee Benefit Plans [Abstract]
Effect on total service and interest cost components, Percentage Point Increase	$ 434
Effect on total service and interest cost components, Percentage Point Decrease	(335)
Effect on accumulated post-retirement benefit obligation, Percentage Point Increase	6,257
Effect on accumulated post-retirement benefit obligation, Percentage Point Decrease	$ (4,833)

Employee Benefit Plans (Post-Re

Employee Benefit Plans (Post-Retirement Benefit Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-retirement benefit expenses	$ 1,231	$ 1,829	$ 2,814

Dividend Restrictions And Sta_3

Dividend Restrictions And Statutory Financial Information (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Dividend Restrictions And Statutory Financial Information [Line Items]
Minimum solvency margin	$ 250
Prior approval of the Bermuda Monetary Authority is required for dividend payments, if percentage exceeds in prior-year end total statutory capital	0.25
Dividend payment restrictions, period in months	12 months
Dividend payment restrictions, percentage of statutory surplus required	0.10
Minimum percent of total adjusted capital	200.00%
Bermuda Re [Member]
Dividend Restrictions And Statutory Financial Information [Line Items]
Statutory capital and surplus	$ 3,197,418	$ 3,068,534
Statutory net income(loss)	$ 503,610	873,111	$ 582,128
Target capital level, percent of the enhanced capital requirement	1.20
Everest Re [Member]
Dividend Restrictions And Statutory Financial Information [Line Items]
Available for payment of dividends in 2016 without need for prior regulatory approval	$ 373,914
Statutory capital and surplus	3,739,140	3,650,594
Statutory net income(loss)	$ 363,034	$ 1,317,991	$ 391,419

Dividend Restrictions And Sta_4

Dividend Restrictions And Statutory Financial Information (Regulatory Targeted Capital And The Actual Statutory Capital) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Minimum percent of total adjusted capital	200.00%
Bermuda Re [Member]
ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Regulatory targeted capital		$ 1,753,156
Actual capital	3,197,418	3,068,534
Everest Re [Member]
ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Regulatory targeted capital	2,001,226	2,172,958
Actual capital	$ 3,739,140	$ 3,650,594

Commitments And Contingencies_2

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 141,703	$ 142,754
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 35,082	$ 34,717

Share-Based Compensation Plan_2

Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 27, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized		200,000,000	200,000,000
Share-based compensation awards, grant exercise price		$ 0
Share units		0	0	0
Share-based compensation expense		$ 34,018	$ 32,369	$ 30,297
Income tax benefit recorded		8,384	7,401	14,824
Additional paid-in capital due to tax benefit from dividends on restricted shares		484	403	626
Aggregate intrinsic value of options exercised		16,297	11,737	14,130
Cash received from the exercised share options		8,523
Tax benefit realized from the options exercised		3,198
Unrecognized compensation cost		79,780
Tax benefit from stock options vested		5,774
Fair value of shares vested		$ 28,135	25,317	23,134
Unrecognized compensation cost expected to be recognized over a weighted-average period, years		3 years 4 months 24 days
Aggregate value of issuances		$ 107	$ 113	$ 94
Employee Plans, 1995 And 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units		0
2002 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options and restricted shares granted		20.00%
Vesting period, years		5 years
2010 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized		4,000,000
Remaining shares		2,303,555
Percentage of options and restricted shares granted		20.00%
Vesting period, years		5 years
2009 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized		37,439
Remaining shares		34,957
Vesting period, years		10 years
2003 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized		500,000
Remaining shares		324,913
Percentage of options and restricted shares granted		33.00%
Vesting period, years		3 years
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued		2,525,422
Restricted shares cancelled		331,938
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, issued		459	480	404
Restricted shares issued		167,618
Restricted shares cancelled		0
Common stock acquired for net-share settlement		71,437	65,974	60,453
Common stock values of shares acquired for net-share settlement		$ 14,181	$ 14,202	$ 14,240
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units		232,601
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units	16,855
Common stock acquired for net-share settlement		5,008	5,214
Common stock values of shares acquired for net-share settlement		$ 1,119	$ 1,264
Performance Shares [Member] | 2010 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options and restricted shares granted		100.00%
Vesting period, years		3 years
Performance Shares [Member] | 2010 Employee Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock per unit awarded		1.75
Performance Shares [Member] | 2010 Employee Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock per unit awarded
Performance Shares [Member] | 2010 Employee Plan [Member] | Growth In Book Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years		3 years
Performance share unit valuation growth, percentage		50.00%
Performance Shares [Member] | 2010 Employee Plan [Member] | Operating Return on Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share unit valuation growth, percentage		50.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units		0

Share-Based Compensation Plan_3

Share-Based Compensation Plans (Company's Shareholder Approved Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-Based Compensation Plans [Abstract]
Outstanding at January 1, Shares	279,164	360,364	454,994
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross	0	0	0
Exercised, Shares	108,460	81,200	94,630
Forfeited/Cancelled/Expired, Shares
Outstanding at December 31, Shares	170,704	279,164	360,364
Exercisable at December 31, Shares	170,704	279,164	360,364
Outstanding at January 1, Weighted-Average Exercise Price/Share	$ 83.84	$ 84.10	$ 84.88
Granted - Weighted- Average Exercise Price/Share	0
Exercised, Weighted- Average Exercise Price/Share	78.58	84.99	87.84
Forfeited/Cancelled/Expired, Weighted- Average Exercise Price/Share
Outstanding at December 31, Weighted-Average Exercise Price/Share	87.18	83.84	84.10
Exercisable at December 31, Weighted-Average Exercise Price/Share	$ 87.18	$ 83.84	$ 84.10
Outstanding at December 31, Weighted-Average Remaining Contractual Term	1 year 4 months 24 days	1 year 10 months 24 days	2 years 8 months 12 days
Exercisable at December 31, Weighted-Average Remaining Contractual Term	1 year 4 months 24 days	1 year 10 months 24 days	2 years 8 months 12 days
Outstanding at December 31, Aggregate Intrinsic Value	$ 32,376	$ 37,386	$ 49,428
Exercisable at December 31, Aggregate Intrinsic Value	$ 32,376	$ 37,386	$ 49,428

Share-Based Compensation Plan_4

Share-Based Compensation Plans (Share Options Outstanding And Exercisable) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	170,704	170,704
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 4 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 87.18	$ 87.18
Exercise Prices Range 1 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	84.6300
Ranges of Exercise Prices, Upper range limit	$ 85.6300
Options Outstanding, Number Outstanding	31,100	31,100
Options Outstanding, Weighted Average-Remaining Contractual Life	2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 84.63	$ 84.63
Exercise Prices Range 2 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	85.6400
Ranges of Exercise Prices, Upper range limit	$ 87.4700
Options Outstanding, Number Outstanding	59,900	59,900
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 2 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 86.62	$ 86.62
Exercise Prices Range 3 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	87.4800
Ranges of Exercise Prices, Upper range limit	$ 89.4100
Options Outstanding, Number Outstanding	73,750	73,750
Options Outstanding, Weighted Average-Remaining Contractual Life	2 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 88.32	$ 88.32
Exercise Prices Range 4 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	89.4200
Ranges of Exercise Prices, Upper range limit	$ 110.1300
Options Outstanding, Number Outstanding	5,954	5,954
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 6 months
Options Outstanding, Weighted Average Exercise Price	$ 91.99	$ 91.99

Share-Based Compensation Plan_5

Share-Based Compensation Plans (Summary Of Company's Non-Vested Shares And Changes) (Details) - Restricted Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares	414,407	421,261	435,338
Granted, Shares	232,601	173,065	160,185
Vested, Shares	138,322	141,982	152,397
Forfeited, Shares	13,549	37,937	21,865
Outstanding at December 31, Shares	495,137	414,407	421,261
Outstanding at January 1, Weighted Average Grant Date Fair Value	$ 217.15	$ 194.01	$ 164.21
Granted, Weighted Average Grant Date Fair Value		240.59	234.01
Vested, Weighted Average Grant Date Fair Value		178.31	151.80
Forfeited, Weighted Average Grant Date Fair Value		212.48	187.82
Outstanding at December 31, Weighted Average Grant Date Fair Value		$ 217.15	$ 194.01

Share-Based Compensation Plan_6

Share-Based Compensation Plans (Company's Non-Vested Performance Share Unit Awards) (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares	32,382	33,454	21,223
Granted, Shares	16,855	13,325	11,245
Increase/(Decrease) on vesting units due to performance, Shares	(3,455)	(267)	986
Vested, Shares	10,922	12,435
Forfeited, Shares		1,695
Outstanding at December 31, Shares	34,850	32,382	33,454
Outstanding at January 1, Weighted Average Grant Date Fair Value
Granted, Weighted Average Grant Date Fair Value	223.45	242.39	234.03
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value	223.45	242.39
Forfeited, Weighted Average Grant Date Fair Value
Outstanding at December 31, Weighted Average Grant Date Fair Value

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Percentage threshold of Company revenue not exceeded by any other country	23.10%	19.70%	20.40%

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Gross written premiums									$ 2,783,036	$ 2,240,951	$ 2,083,555
Net written premiums	$ 2,120,186	$ 2,068,557	$ 1,783,983	$ 1,851,698	$ 2,057,071	$ 1,938,773	$ 1,746,378	$ 1,672,206	7,824,424	7,414,428	6,244,661
Premiums earned	$ 1,948,071	$ 1,905,619	$ 1,817,299	$ 1,732,697	$ 1,850,975	$ 1,731,479	$ 1,729,818	$ 1,619,427	7,403,686	6,931,699	5,937,840
Incurred losses and LAE									4,922,898	5,651,403	4,522,581
Commission and brokerage									1,703,726	1,519,030	1,303,963
Other underwriting expenses									440,899	371,541	318,817
Underwriting gain (loss)									336,163	(610,275)	(207,521)
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums									2,962,416	3,014,338	2,592,972
Net written premiums									2,513,579	2,642,182	2,245,422
Premiums earned									2,471,447	2,528,991	2,181,160
Incurred losses and LAE									1,514,151	2,784,181	1,632,795
Commission and brokerage									703,803	568,374	462,487
Other underwriting expenses									68,796	60,266	55,881
Underwriting gain (loss)									184,697	(883,830)	29,997
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums									1,648,598	1,543,946	1,316,701
Net written premiums									1,551,753	1,458,745	1,229,597
Premiums earned									1,475,669	1,439,882	1,202,043
Incurred losses and LAE									1,193,816	992,704	1,059,640
Commission and brokerage									342,400	364,010	287,688
Other underwriting expenses									41,690	39,042	38,844
Underwriting gain (loss)									(102,237)	44,126	(184,129)
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums									1,744,875	1,666,317	1,205,001
Net written premiums									1,666,940	1,605,526	1,139,082
Premiums earned									1,544,180	1,324,198	1,093,250
Incurred losses and LAE									967,211	808,717	735,292
Commission and brokerage									354,044	319,197	303,707
Other underwriting expenses									50,348	43,566	38,011
Underwriting gain (loss)									172,577	152,718	16,240
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums									2,777,475	2,250,552	2,059,248
Net written premiums									2,092,152	1,707,975	1,630,560
Premiums earned									1,912,390	1,638,628	1,461,387
Incurred losses and LAE									1,247,720	1,065,801	1,094,854
Commission and brokerage									303,479	267,449	250,081
Other underwriting expenses									280,065	228,667	186,081
Underwriting gain (loss)									$ 81,126	$ 76,711	$ (69,629)

Segment Reporting (Schedule O_2

Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)												$ 336,163	$ (610,275)	$ (207,521)
Net Investment Income	$ 146,077	$ 181,058	$ 179,028	$ 140,976	$ 140,204	$ 161,363	$ 141,322	$ 138,294				647,139	581,183	542,898
Net realized capital gains (losses)	$ 75,443	$ (12,943)	30,272	92,232	$ (172,815)	54,804	15,776	(24,901)				185,004	(127,136)	153,194
Net derivative gain (loss)												6,374	520	9,581
Corporate expenses												(32,966)	(30,672)	(25,923)
Other income (expense)			(18,225)	(3,300)		(13,408)	(6,573)	17,033	$ (21,525)	$ 10,460	$ (2,948)	(11,034)	(24,771)	(21,215)
INCOME (LOSS) BEFORE TAXES			$ 372,345	$ 414,544		$ 189,471	$ 51,154	$ 222,612	$ 786,889	$ 273,766	$ 463,237	$ 1,098,987	$ (242,182)	$ 419,411

Segment Reporting (Schedule O_3

Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Gross written premiums	$ 2,783,036	$ 2,240,951	$ 2,083,555
United Kingdom [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 964,358	$ 914,612	$ 730,826

Unaudited Quarterly Financial_3

Unaudited Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unaudited Quarterly Financial Data [Abstract]
Gross written premiums	$ 2,436,327	$ 2,403,274	$ 2,166,655	$ 2,127,108	$ 2,278,361	$ 2,198,664	$ 2,066,521	$ 1,931,607
Net written premiums	2,120,186	2,068,557	1,783,983	1,851,698	2,057,071	1,938,773	1,746,378	1,672,206				$ 7,824,424	$ 7,414,428	$ 6,244,661
Premiums earned	1,948,071	1,905,619	1,817,299	1,732,697	1,850,975	1,731,479	1,729,818	1,619,427				7,403,686	6,931,699	5,937,840
Net investment income	146,077	181,058	179,028	140,976	140,204	161,363	141,322	138,294				647,139	581,183	542,898
Net realized capital gains (losses)	75,443	(12,943)	30,272	92,232	(172,815)	54,804	15,776	(24,901)				185,004	(127,136)	153,194
Total claims and underwriting expenses	1,976,943	1,933,158	1,620,413	1,537,009	2,481,858	1,731,201	1,817,815	1,511,100				7,132,182	7,603,677	6,202,887
Net income (loss)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	$ 1,009,461	$ 89,041	$ 482,751
Basic	$ 5.34	$ 2.56	$ 8.17	$ 8.70	$ (9.58)	$ 4.87	$ 1.49	$ 5.26	$ 16.88	$ 6.75	$ 11.61	$ 24.77	$ 2.18	$ 11.77
Diluted	$ 5.32	$ 2.56	$ 8.15	$ 8.67	$ (9.58)	$ 4.84	$ 1.48	$ 5.23	$ 16.82	$ 6.71	$ 11.55	$ 24.70	$ 2.17	$ 11.70

Revisions To Financial Statem_3

Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
ASSETS:
Premiums receivable	$ 2,259,088	$ 2,351,107	$ 2,362,263	$ 2,183,183				$ 1,819,775
Funds held by reinsureds	489,901	487,275	423,211	435,031				288,635
Income taxes	305,711	360,718	477,851	594,487				300,340
TOTAL ASSETS	27,324,051	26,340,448	25,593,151	24,750,992				23,563,296
SHAREHOLDERS' EQUITY:
Retained earnings	10,306,571	10,104,716	9,828,847	9,531,433				9,657,412
Total shareholders' equity	9,132,925	8,836,817	8,389,273	7,860,797	$ 8,289,045	$ 8,208,613	$ 8,320,552	8,340,736
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 27,324,051	26,340,448	25,593,151	24,750,992				23,563,296
As Previously Reported [Member]
ASSETS:
Premiums receivable		2,389,943	2,392,094	2,218,283				1,844,881
Funds held by reinsureds		498,043	432,736	445,040				292,927
Income taxes		358,457	475,851	592,385				299,438
TOTAL ASSETS		26,387,791	25,630,507	24,793,999				23,591,792
SHAREHOLDERS' EQUITY:
Retained earnings		10,152,059	9,866,203	9,574,440				9,685,908
Total shareholders' equity		8,884,160	8,426,629	7,903,804	8,329,013	8,241,349	8,344,180	8,369,232
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY		26,387,791	25,630,507	24,793,999				23,591,792
Impact of Revisions [Member]
ASSETS:
Premiums receivable		(38,836)	(29,831)	(35,100)				(25,106)
Funds held by reinsureds		(10,768)	(9,525)	(10,009)				(4,292)
Income taxes		2,261	2,000	2,102				902
TOTAL ASSETS		(47,343)	(37,356)	(43,007)				(28,496)
SHAREHOLDERS' EQUITY:
Retained earnings		(47,343)	(37,356)	(43,007)				(28,496)
Total shareholders' equity		(47,343)	(37,356)	(43,007)	$ (39,968)	$ (32,736)	$ (23,628)	(28,496)
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY		$ (47,343)	$ (37,356)	$ (43,007)				$ (28,496)

Revisions To Financial Statem_4

Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Operations And Comprehensive Income (Loss)) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES:
Other income (expense)			$ (18,225)	$ (3,300)		$ (13,408)	$ (6,573)	$ 17,033	$ (21,525)	$ 10,460	$ (2,948)	$ (11,034)	$ (24,771)	$ (21,215)
Total revenues			2,008,727	1,965,836		1,936,463	1,883,330	1,750,126	3,974,563	3,633,456	5,569,919	8,231,169	7,361,495	6,622,298
INCOME (LOSS) BEFORE TAXES			372,345	414,544		189,471	51,154	222,612	786,889	273,766	463,237	1,098,987	(242,182)	419,411
Income tax expense (benefit)			39,477	59,993		(8,910)	(9,633)	7,426	99,470	(2,207)	(11,117)	89,526	(331,223)	(63,340)
NET INCOME (LOSS)	$ 217,644	$ 104,398	332,868	354,551	$ (385,313)	198,381	60,787	215,186	687,419	275,973	474,354	1,009,461	89,041	482,751
COMPREHENSIVE INCOME (LOSS)			$ 504,077	$ 600,997		$ 173,402	$ (42,577)	$ 35,304	$ 1,105,074	$ (7,273)	$ 166,129	$ 1,500,170	$ (211,424)	$ 539,874
EARNINGS PER COMMON SHARE:
Basic	$ 5.34	$ 2.56	$ 8.17	$ 8.70	$ (9.58)	$ 4.87	$ 1.49	$ 5.26	$ 16.88	$ 6.75	$ 11.61	$ 24.77	$ 2.18	$ 11.77
Diluted	$ 5.32	$ 2.56	$ 8.15	$ 8.67	$ (9.58)	$ 4.84	$ 1.48	$ 5.23	$ 16.82	$ 6.71	$ 11.55	$ 24.70	$ 2.17	$ 11.70
As Previously Reported [Member]
REVENUES:
Other income (expense)			$ (7,977)	$ (9,053)		$ (5,458)	$ 3,036	$ 12,064	$ (17,030)	$ 15,100	$ 9,642		$ (9,060)	$ (35,442)
Total revenues			2,018,975	1,960,083		1,944,413	1,892,939	1,745,157	3,979,058	3,638,096	5,582,509		7,377,206	6,608,071
INCOME (LOSS) BEFORE TAXES			382,593	408,791		197,421	60,763	217,643	791,384	278,406	475,827		(226,471)	405,184
Income tax expense (benefit)			39,738	59,891		(8,192)	(9,132)	7,325	99,629	(1,807)	(9,999)		(330,023)	(63,784)
NET INCOME (LOSS)			342,855	348,900		205,613	69,895	210,318	691,755	280,213	485,826		103,552	468,968
COMPREHENSIVE INCOME (LOSS)			$ 514,064	$ 595,346		$ 180,634	$ (33,469)	$ 30,436	$ 1,109,410	$ (3,033)	$ 177,601		$ (196,913)	$ 526,091
EARNINGS PER COMMON SHARE:
Basic			$ 8.42	$ 8.57		$ 5.04	$ 1.71	$ 5.14	$ 16.98	$ 6.85	$ 11.89		$ 2.54	$ 11.43
Diluted			$ 8.39	$ 8.54		$ 5.02	$ 1.70	$ 5.11	$ 16.93	$ 6.81	$ 11.83		$ 2.53	$ 11.36
Impact of Revisions [Member]
REVENUES:
Other income (expense)			$ (10,248)	$ 5,753		$ (7,950)	$ (9,609)	$ 4,969	$ (4,495)	$ (4,640)	$ (12,590)		$ (15,711)	$ 14,227
Total revenues			(10,248)	5,753		(7,950)	(9,609)	4,969	(4,495)	(4,640)	(12,590)		(15,711)	14,227
INCOME (LOSS) BEFORE TAXES			(10,248)	5,753		(7,950)	(9,609)	4,969	(4,495)	(4,640)	(12,590)		(15,711)	14,227
Income tax expense (benefit)			(261)	102		(718)	(501)	101	(159)	(400)	(1,118)		(1,200)	444
NET INCOME (LOSS)			(9,987)	5,651		(7,232)	(9,108)	4,868	(4,336)	(4,240)	(11,472)		(14,511)	13,783
COMPREHENSIVE INCOME (LOSS)			$ (9,987)	$ 5,651		$ (7,232)	$ (9,108)	$ 4,868	$ (4,336)	$ (4,240)	$ (11,472)		$ (14,511)	$ 13,783
EARNINGS PER COMMON SHARE:
Basic			$ (0.25)	$ 0.13		$ (0.17)	$ (0.22)	$ 0.12	$ (0.10)	$ (0.10)	$ (0.28)		$ (0.36)	$ 0.34
Diluted			$ (0.24)	$ 0.13		$ (0.18)	$ (0.22)	$ 0.12	$ (0.11)	$ (0.10)	$ (0.28)		$ (0.36)	$ 0.34

Revisions To Financial Statem_5

Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Stockholder's Equity) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		$ 8,836,817	$ 8,389,273	$ 7,860,797	$ 8,289,045	$ 8,208,613	$ 8,320,552	$ 8,340,736	$ 7,860,797	$ 8,340,736	$ 8,340,736	$ 7,860,797	$ 8,340,736
Net income (loss)	$ 217,644	104,398	332,868	354,551	(385,313)	198,381	60,787	215,186	687,419	275,973	474,354	1,009,461	89,041	$ 482,751
Balance	9,132,925		8,836,817	8,389,273	7,860,797	8,289,045	8,208,613	8,320,552	8,836,817	8,208,613	8,289,045	9,132,925	7,860,797	8,340,736
Retained Earnings [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		10,104,716	9,828,847	9,531,433	9,973,624	9,828,106	9,820,559	9,657,412	9,531,433	9,657,412	9,657,412	9,531,433	9,657,412	9,380,653
Net income (loss)			332,868	354,551		198,381	60,787	215,186		275,973	474,354	1,009,461	89,041	482,751
Balance	$ 10,306,571		10,104,716	9,828,847	9,531,433	9,973,624	9,828,106	9,820,559	10,104,716	9,828,106	9,973,624	10,306,571	9,531,433	9,657,412
As Previously Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		8,884,160	8,426,629	7,903,804	8,329,013	8,241,349	8,344,180	8,369,232	7,903,804	8,369,232	8,369,232	7,903,804	8,369,232
Net income (loss)			342,855	348,900		205,613	69,895	210,318	691,755	280,213	485,826		103,552	468,968
Balance			8,884,160	8,426,629	7,903,804	8,329,013	8,241,349	8,344,180	8,884,160	8,241,349	8,329,013		7,903,804	8,369,232
As Previously Reported [Member] | Retained Earnings [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		10,152,059	9,866,203	9,574,440	10,013,592	9,860,842	9,844,187	9,685,908	9,574,440	9,685,908	9,685,908	9,574,440	9,685,908	9,422,932
Net income (loss)			342,855	348,900		205,613	69,895	210,318		280,213	485,826		103,552	468,968
Balance			10,152,059	9,866,203	9,574,440	10,013,592	9,860,842	9,844,187	10,152,059	9,860,842	10,013,592		9,574,440	9,685,908
Impact of Revisions [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		(47,343)	(37,356)	(43,007)	(39,968)	(32,736)	(23,628)	(28,496)	(43,007)	(28,496)	(28,496)	(43,007)	(28,496)
Net income (loss)			(9,987)	5,651		(7,232)	(9,108)	4,868	(4,336)	(4,240)	(11,472)		(14,511)	13,783
Balance			(47,343)	(37,356)	(43,007)	(39,968)	(32,736)	(23,628)	(47,343)	(32,736)	(39,968)		(43,007)	(28,496)
Impact of Revisions [Member] | Retained Earnings [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Balance		$ (47,343)	(37,356)	(43,007)	(39,968)	(32,736)	(23,628)	(28,496)	(43,007)	(28,496)	(28,496)	$ (43,007)	(28,496)	(42,279)
Net income (loss)			(9,987)	5,651		(7,232)	(9,108)	4,868		(4,240)	(11,472)		(14,511)	13,783
Balance			$ (47,343)	$ (37,356)	$ (43,007)	$ (39,968)	$ (32,736)	$ (23,628)	$ (47,343)	$ (32,736)	$ (39,968)		$ (43,007)	$ (28,496)

Revisions To Financial Statem_6

Revisions To Financial Statements (Schedule Of Prior Period Financial Statements - Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	$ 1,009,461	$ 89,041	$ 482,751
Decrease (increase) in premiums receivable				(168,377)				(61,315)	(174,583)	(123,622)	(257,291)	(62,018)	(382,987)	(350,446)
Decrease (increase) in funds held by reinsureds, net				9,353				94,936	(55,421)	(75,887)	(73,189)	(56,722)	(153,627)	(33,220)
Decrease (increase) in income taxes				91,856				56,006	180,126	43,116	57,916	$ 237,479	(265,065)	(114,077)
As Previously Reported [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)			342,855	348,900		205,613	69,895	210,318	691,755	280,213	485,826		103,552	468,968
Decrease (increase) in premiums receivable				(163,108)				(56,826)	(178,319)	(126,355)	(264,556)		(392,981)	(338,335)
Decrease (increase) in funds held by reinsureds, net				9,837				95,416	(56,180)	(77,794)	(78,514)		(159,344)	(31,104)
Decrease (increase) in income taxes				91,754				55,905	180,285	43,516	59,034		(263,865)	(114,521)
Impact of Revisions [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)			$ (9,987)	5,651		$ (7,232)	$ (9,108)	4,868	(4,336)	(4,240)	(11,472)		(14,511)	13,783
Decrease (increase) in premiums receivable				(5,269)				(4,489)	3,736	2,733	7,265		9,994	(12,111)
Decrease (increase) in funds held by reinsureds, net				(484)				(480)	759	1,907	5,325		5,717	(2,116)
Decrease (increase) in income taxes				$ 102				$ 101	$ (159)	$ (400)	$ (1,118)		$ (1,200)	$ 444

Schedule I - Summary Of Inves_2

Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands	Dec. 31, 2019USD ($)
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	$ 20,278,211
Total investments and cash, Market Value	20,748,500
Total investments and cash, Amount Shown in Balance Sheet	20,748,500
Total Fixed Maturities Available For Sale [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	16,473,491
Total investments and cash, Market Value	16,824,944
Total investments and cash, Amount Shown in Balance Sheet	16,824,944
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,489,660
Total investments and cash, Market Value	1,515,803
Total investments and cash, Amount Shown in Balance Sheet	1,515,803
Obligations Of U.S. States And Political Subdivisions [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	507,353
Total investments and cash, Market Value	536,915
Total investments and cash, Amount Shown in Balance Sheet	536,915
Foreign Government Securities [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,492,315
Total investments and cash, Market Value	1,505,950
Total investments and cash, Amount Shown in Balance Sheet	1,505,950
Foreign Corporate Securities [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	2,870,737
Total investments and cash, Market Value	2,945,156
Total investments and cash, Amount Shown in Balance Sheet	2,945,156
Public Utilities [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	322,525
Total investments and cash, Market Value	332,818
Total investments and cash, Amount Shown in Balance Sheet	332,818
All Other Corporate Bonds [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	6,789,362
Total investments and cash, Market Value	6,931,485
Total investments and cash, Amount Shown in Balance Sheet	6,931,485
Commercial Mortgage Backed Securities [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	814,570
Total investments and cash, Market Value	844,557
Total investments and cash, Amount Shown in Balance Sheet	844,557
Agency Residential [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	2,173,099
Total investments and cash, Market Value	2,198,581
Total investments and cash, Amount Shown in Balance Sheet	2,198,581
Non-Agency Residential [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	5,723
Total investments and cash, Market Value	5,703
Total investments and cash, Amount Shown in Balance Sheet	5,703
Redeemable Preferred Stock [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	8,147
Total investments and cash, Market Value	7,976
Total investments and cash, Amount Shown in Balance Sheet	7,976
Fixed Maturities - Available For Sale At Fair Value [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	3,966
Total investments and cash, Market Value	5,826
Total investments and cash, Amount Shown in Balance Sheet	5,826
Equity Securities - Available For Sale At Fair Value [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	814,548
Total investments and cash, Market Value	931,457
Total investments and cash, Amount Shown in Balance Sheet	931,457
Short-Term Investments [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	414,639
Total investments and cash, Market Value	414,706
Total investments and cash, Amount Shown in Balance Sheet	414,706
Other Invested Assets [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	1,763,531
Total investments and cash, Market Value	1,763,531
Total investments and cash, Amount Shown in Balance Sheet	1,763,531
Cash [Member]
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Total investments and cash, Cost	808,036
Total investments and cash, Market Value	808,036
Total investments and cash, Amount Shown in Balance Sheet	$ 808,036

Schedule II - Condensed Finan_2

Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 17, 2019
Debt Instrument [Line Items]
Other assets									$ 612,997,000	$ 358,042,000
Other income (expense)	$ (18,225,000)	$ (3,300,000)	$ (13,408,000)	$ (6,573,000)	$ 17,033,000	$ (21,525,000)	$ 10,460,000	$ (2,948,000)	(11,034,000)	(24,771,000)	$ (21,215,000)
Mt. Logan Re Segregated Accounts [Member]
Debt Instrument [Line Items]
Other assets									46,390,000	45,625,000
Other income (expense)									765,000	(4,695,000)	(6,352,000)
Parent Company [Member]
Debt Instrument [Line Items]
Other assets									44,646,000	44,737,000
Other income (expense)									$ 458,000	$ (5,299,000)	$ (6,872,000)
Parent Company [Member] | Notes Payable Other Payables [Member]
Debt Instrument [Line Items]
Debt instrument face amount												$ 300,000,000
Maturity Date									Dec. 1, 2028
Debt instrument, stated interest rate												1.69%

Schedule II - Condensed Finan_3

Schedule II - Condensed Financial Information Of The Registrant (Condensed Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 16,824,944	$ 15,225,263
Other invested assets	1,763,531	1,591,745
Cash	808,036	656,095
Accrued investment income	116,804	104,619
Other assets	612,997	358,042
TOTAL ASSETS	27,324,051	24,750,992	$ 26,340,448	$ 25,593,151				$ 23,563,296
Other liabilities	453,264	189,882
Total liabilities	18,191,126	16,890,195
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding
Common shares, par value	694	692
Additional paid-in capital	2,219,660	2,188,777
Accumulated other comprehensive income (loss), net of deferred income	28,152	(462,557)
Treasury shares, at cost;	(3,422,152)	(3,397,548)
Retained earnings	10,306,571	9,531,433	10,104,716	9,828,847				9,657,412
Total shareholders' equity	9,132,925	7,860,797	8,836,817	8,389,273	$ 8,289,045	$ 8,208,613	$ 8,320,552	8,340,736
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	27,324,051	24,750,992	$ 26,340,448	$ 25,593,151				$ 23,563,296
Fixed maturities - available for sale, at market value, amortized cost	16,473,491	15,406,572
Other invested assets, at cost	$ 1,763,531	$ 1,591,745
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common shares, outstanding	69,464,000	69,202,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit)	$ 30,996	$ (20,697)
Treasury shares, at cost	28,665,000	28,551,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 201,666	$ 76,170
Other invested assets	41,700	91
Cash	3,471	198
Investment in subsidiaries, at equity in the underlying net assets	9,134,038	7,733,933
Accrued investment income	652	277
Receivable from subsidiaries	9,361	6,726
Other assets	44,646	44,737
TOTAL ASSETS	9,435,534	7,862,132
Long term note payable - Affiliated	300,000
Due to subsidiaries	1,491	1,065
Other liabilities	1,118	270
Total liabilities	302,609	1,335
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding
Common shares, par value	694	692
Additional paid-in capital	2,219,660	2,188,777
Accumulated other comprehensive income (loss), net of deferred income	28,152	(462,557)
Treasury shares, at cost;	(3,422,152)	(3,397,548)
Retained earnings	10,306,571	9,531,433
Total shareholders' equity	9,132,925	7,860,797
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	9,435,534	7,862,132
Fixed maturities - available for sale, at market value, amortized cost	201,581	76,274
Other invested assets, at cost	$ 41,700	$ 91
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common shares, issued	69,464,000	69,202,000
Common shares, outstanding	69,464,000	69,202,000
Treasury shares, at cost	28,665,000	28,551,000
Parent Company [Member] | Notes Payable Other Payables [Member]
Condensed Financial Statements, Captions [Line Items]
Date due	Dec. 1, 2028

Schedule II - Condensed Finan_4

Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net Investment Income	$ 146,077	$ 181,058	$ 179,028	$ 140,976	$ 140,204	$ 161,363	$ 141,322	$ 138,294				$ 647,139	$ 581,183	$ 542,898
Net realized capital gains (losses)	75,443	(12,943)	30,272	92,232	(172,815)	54,804	15,776	(24,901)				185,004	(127,136)	153,194
Other income (expense)			(18,225)	(3,300)		(13,408)	(6,573)	17,033	$ (21,525)	$ 10,460	$ (2,948)	(11,034)	(24,771)	(21,215)
Total revenues			2,008,727	1,965,836		1,936,463	1,883,330	1,750,126	3,974,563	3,633,456	5,569,919	8,231,169	7,361,495	6,622,298
Interest expense - affiliated												31,693	31,031	31,603
Total claims and expenses	1,976,943	1,933,158	1,620,413	1,537,009	2,481,858	1,731,201	1,817,815	1,511,100				7,132,182	7,603,677	6,202,887
INCOME (LOSS) BEFORE TAXES			372,345	414,544		189,471	51,154	222,612	786,889	273,766	463,237	1,098,987	(242,182)	419,411
Income tax expense (benefit)			(39,477)	(59,993)		8,910	9,633	(7,426)	(99,470)	2,207	11,117	(89,526)	331,223	63,340
NET INCOME (LOSS)	$ 217,644	$ 104,398	332,868	354,551	$ (385,313)	198,381	60,787	215,186	687,419	275,973	474,354	1,009,461	89,041	482,751
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period												496,430	(255,656)	(64,348)
Reclassification adjustment for realized losses (gains) included in net income (loss)												(12,613)	27,496	(6,950)
Total URA(D) on securities arising during the period												483,817	(228,160)	(71,298)
Foreign currency translation adjustments												14,030	(76,816)	121,917
Benefit plan actuarial net gain (loss) for the period												(12,591)	(510)	1,027
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)												5,453	5,021	5,477
Total benefit plan net gain (loss) for the period												(7,138)	4,511	6,504
Total other comprehensive income (loss), net of tax												490,709	(300,465)	57,123
COMPREHENSIVE INCOME (LOSS)			$ 504,077	$ 600,997		$ 173,402	$ (42,577)	$ 35,304	$ 1,105,074	$ (7,273)	$ 166,129	1,500,170	(211,424)	539,874
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net Investment Income												3,484	3,790	1,344
Net realized capital gains (losses)												(66)	(57)	80
Other income (expense)												458	(5,299)	(6,872)
Net income (loss) of subsidiaries												1,026,233	112,859	509,279
Total revenues												1,030,109	111,293	503,831
Interest expense - affiliated												2,087	4,085	4,300
Other expenses												18,561	18,167	16,780
Total claims and expenses												20,648	22,252	21,080
INCOME (LOSS) BEFORE TAXES												1,009,461	89,041	482,751
NET INCOME (LOSS)												1,009,461	89,041	482,751
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period												496,430	(255,656)	(64,348)
Reclassification adjustment for realized losses (gains) included in net income (loss)												(12,613)	27,496	(6,950)
Total URA(D) on securities arising during the period												483,817	(228,160)	(71,298)
Foreign currency translation adjustments												14,030	(76,816)	121,917
Benefit plan actuarial net gain (loss) for the period												(12,591)	(510)	1,027
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)												5,453	5,021	5,477
Total benefit plan net gain (loss) for the period												(7,138)	4,511	6,504
Total other comprehensive income (loss), net of tax												490,709	(300,465)	57,123
COMPREHENSIVE INCOME (LOSS)												$ 1,500,170	$ (211,424)	$ 539,874

Schedule II - Condensed Finan_5

Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 217,644	$ 104,398	$ 332,868	$ 354,551	$ (385,313)	$ 198,381	$ 60,787	$ 215,186	$ 687,419	$ 275,973	$ 474,354	$ 1,009,461	$ 89,041	$ 482,751
Change in other assets and liabilities, net												(54,176)	(322,107)	(66,998)
Amortization of bond premium (accrual of bond discount)												30,936	29,272	45,867
Realized capital losses (gains)	(75,443)	$ 12,943	$ (30,272)	(92,232)	172,815	$ (54,804)	$ (15,776)	24,901				(185,004)	127,136	(153,194)
Non-cash compensation expense												34,018	32,369	30,297
Net cash provided by (used in) operating activities												1,852,002	610,069	1,162,693
Proceeds from fixed maturities sold - available for sale, at market value												3,280,237	3,148,428	2,401,844
Distributions from other invested assets												284,558	3,102,018	5,579,043
Cost of fixed maturities acquired - available for sale, at market value												(6,613,917)	(5,909,504)	(5,131,098)
Cost of other invested assets acquired												(425,438)	(3,370,455)	(5,829,271)
Net change in short-term investments												(167,290)	455,350	(73,923)
Net cash provided by (used in) investing activities												(1,412,492)	(279,621)	(732,577)
Purchase of treasury shares												(24,604)	(75,304)	(50,000)
Dividends paid to shareholders												(234,322)	(216,221)	(207,242)
Net cash provided by (used in) financing activities												(275,687)	(316,594)	(275,458)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)												1,009,461	89,041	482,751
Equity in retained (earnings) deficit of subsidiaries												(1,026,233)	(112,859)	(509,279)
Change in other assets and liabilities, net												564	4,824	6,107
Increase (decrease) in due to/from affiliate												(2,209)	683	(6,470)
Amortization of bond premium (accrual of bond discount)												(9)	(577)	12
Realized capital losses (gains)												66	57	(80)
Non-cash compensation expense												2,796	2,740	3,448
Net cash provided by (used in) operating activities												584,436	933,909	401,489
Additional investment in subsidiaries												(478,125)	(542,965)	(109,815)
Proceeds from fixed maturities matured/called - available for sale, at market value												63	93	696
Proceeds from fixed maturities sold - available for sale, at market value												74,841	24,856	90,154
Distributions from other invested assets												(200,267)		(189,308)
Cost of fixed maturities acquired - available for sale, at market value												(686,528)	(923,828)	(503,937)
Cost of other invested assets acquired												644,918	1,026,297	546,414
Net change in short-term investments
Net cash provided by (used in) investing activities												(645,098)	(415,547)	(165,796)
Common shares issued during the period, net												22,861	20,086	22,790
Purchase of treasury shares												(24,604)	(75,304)	(50,000)
Dividends paid to shareholders												(234,322)	(216,221)	(207,242)
Net cash provided by (used in) financing activities												63,935	(521,439)	(234,452)
EFFECT OF EXCHANGE RATE CHANGES ON CASH
Net increase (decrease) in cash												3,273	(3,077)	1,241
Cash, beginning of period				$ 198				$ 3,275	$ 198	$ 3,275	$ 3,275	198	3,275	2,034
Cash, end of period	$ 3,471				$ 198							3,471	198	3,275
Parent Company [Member] | Everest International [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries													200,000
Parent Company [Member] | Mt. Logan Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries														25,000
Bermuda Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries												$ 600,000	$ 750,000	$ 400,000

Schedule III - Supplementary _2

Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	$ 581,863	$ 511,573	$ 411,587
Reverse for Losses and Loss Adjustment Expenses	13,611,313	13,119,090	11,884,321
Unearned Premium Reserves	3,056,735	2,517,612	2,000,556
Premiums Earned	7,403,686	6,931,699	5,937,840
Net Investment Income	647,139
Incurred Loss and Loss Adjustment Expenses	4,922,898	5,651,403	4,522,581
Amortization of Deferred Acquisition Costs	1,703,726	1,519,030	1,303,963
Other Operating Expenses	440,899	371,541	318,817
Net Written Premium	7,824,424	7,414,428	6,244,661
Domestic Country [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	358,108	334,818	289,636
Reverse for Losses and Loss Adjustment Expenses	7,823,095	8,154,003	7,254,043
Unearned Premium Reserves	2,014,712	1,695,208	1,460,291
Premiums Earned	4,383,837	4,167,619	3,642,547
Net Investment Income	320,923
Incurred Loss and Loss Adjustment Expenses	2,761,871	3,849,982	2,727,649
Amortization of Deferred Acquisition Costs	1,007,282	835,823	712,568
Other Operating Expenses	348,861	288,933	241,962
Net Written Premium	4,605,731	4,350,157	3,875,982
International Country [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	66,183	54,253	53,186
Reverse for Losses and Loss Adjustment Expenses	2,655,458	2,209,202	2,175,500
Unearned Premium Reserves	344,222	261,611	253,626
Premiums Earned	1,475,669	1,439,882	1,202,043
Net Investment Income	37,297
Incurred Loss and Loss Adjustment Expenses	1,193,816	992,704	1,059,640
Amortization of Deferred Acquisition Costs	342,400	364,010	287,688
Other Operating Expenses	41,690	39,042	38,844
Net Written Premium	1,551,753	1,458,745	1,229,597
Bermuda Country [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	157,572	122,502	68,765
Reverse for Losses and Loss Adjustment Expenses	3,132,760	2,755,885	2,454,778
Unearned Premium Reserves	697,801	560,793	286,639
Premiums Earned	1,544,180	1,324,198	1,093,250
Net Investment Income	288,919
Incurred Loss and Loss Adjustment Expenses	967,211	808,717	735,292
Amortization of Deferred Acquisition Costs	354,044	319,197	303,707
Other Operating Expenses	50,348	43,566	38,011
Net Written Premium	$ 1,666,940	$ 1,605,526	$ 1,139,082

Schedule IV - Reinsurance (Deta

Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									$ 2,551,662	$ 2,129,320	$ 1,825,705
Ceded to Other Companies									1,207,198	1,004,953	833,387
Assumed from Other Companies									6,059,222	5,807,332	4,945,522
Net Amount	$ 1,948,071	$ 1,905,619	$ 1,817,299	$ 1,732,697	$ 1,850,975	$ 1,731,479	$ 1,729,818	$ 1,619,427	7,403,686	6,931,699	5,937,840
Total Property And Liability Insurance Premiums Earned [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									2,556,386	2,129,320	1,825,705
Ceded to Other Companies									1,207,198	1,004,953	833,387
Assumed from Other Companies									6,054,498	5,807,332	4,945,522
Net Amount									$ 7,403,686	$ 6,931,699	$ 5,937,840
Assumed to Net	81.80%				83.80%				81.80%	83.80%	83.30%