Everest Re (EG) 10-K 1 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Feb. 01, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	EVEREST RE GROUP LTD
Entity Central Index Key	1,095,073
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		40,839,768
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 10,454,792

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2017, $14,689,598; 2016, $13,932,613)	$ 14,756,834	$ 14,107,408
Equity securities - available for sale, at market value (cost: 2017, $130,287; 2016, $129,553)	129,530	119,067
Equity securities - available for sale, at fair value	963,572	1,010,085
Short-term investments	509,682	431,478
Other invested assets (cost: 2017, $1,628,753; 2016, $1,333,069)	1,631,850	1,333,129
Cash	635,067	481,922
Total investments and cash	18,626,535	17,483,089
Accrued investment income	97,704	96,473
Premiums receivable	1,844,881	1,485,990
Reinsurance receivables	1,348,226	1,018,325
Funds held by reinsureds	292,927	260,644
Deferred acquisition costs	411,587	344,052
Prepaid reinsurance premiums	288,211	191,768
Income taxes	299,438	177,704
Other assets	382,283	263,459
TOTAL ASSETS	23,591,792	21,321,504
LIABILITIES:
Reserve for losses and loss adjustment expenses	11,884,321	10,312,313
Future policy benefit reserve	51,014	55,074
Unearned premium reserve	2,000,556	1,577,546
Funds held under reinsurance treaties	18,030	21,278
Commission reserves	30,660	70,335
Other net payable to reinsurers	218,017	190,986
4.868% Senior notes due 6/1/2044	396,834	396,714
6.6% Long term notes due 5/1/2067	236,561	236,462
Accrued interest on debt and borrowings	2,727	3,537
Equity index put option liability	12,477	22,059
Unsettled securities payable	38,743	27,927
Other liabilities	332,620	331,877
Total liabilities	15,222,560	13,246,108
Commitments and contingencies (Note 15)
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; (2017) 69,044 and (2016) 68,871 outstanding before treasury shares	691	689
Additional paid-in capital	2,165,768	2,140,783
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $9,356 at 2017 and $8,240 at 2016	(160,891)	(216,764)
Treasury shares, at cost; 28,208 shares (2017) and 27,972 shares (2016)	(3,322,244)	(3,272,244)
Retained earnings	9,685,908	9,422,932
Total shareholders' equity	8,369,232	8,075,396
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 23,591,792	$ 21,321,504

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fixed maturities - available for sale, at market value, amortized cost	$ 14,689,598	$ 13,932,613
Equity securities - available for sale, at market value, cost	130,287	129,553
Other invested assets, at cost	$ 1,628,753	$ 1,333,069
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 shares, authorized	200,000,000	200,000,000
Common shares, outstanding	69,044,000	68,871,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit)	$ 9,356	$ 8,240
Treasury shares	28,208,000	27,972,000
6.6 % Long Term Subordinated Notes [Member]
Debt instrument, stated interest rate	6.60%	6.60%
Debt instrument, maturity date	May 1, 2067
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt instrument, stated interest rate	4.868%	4.868%
Debt instrument, maturity date	Jun. 1, 2044

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES:
Premiums earned	$ 5,937,840	$ 5,320,466	$ 5,292,842
Net investment income	542,898	473,085	473,473
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	(7,093)	(31,595)	(102,199)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	160,287	24,379	(81,948)
Total net realized capital gains (losses)	153,194	(7,216)	(184,147)
Net derivative gain (loss)	9,581	18,647	6,317
Other income (expense)	(35,442)	(10,636)	88,280
Total revenues	6,608,071	5,794,346	5,676,765
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	4,522,581	3,139,629	3,064,715
Commission, brokerage, taxes and fees	1,303,963	1,188,692	1,183,646
Other underwriting expenses	318,817	302,722	257,069
Corporate expenses	25,923	27,231	23,254
Interest, fees and bond issue cost amortization expense	31,603	36,228	36,191
Total claims and expenses	6,202,887	4,694,502	4,564,875
INCOME (LOSS) BEFORE TAXES	405,184	1,099,844	1,111,890
Income tax expense (benefit)	(63,784)	103,500	134,021
NET INCOME (LOSS)	468,968	996,344	977,869
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	(64,348)	57,629	(274,127)
Reclassification adjustment for realized losses (gains) included in net income (loss)	(6,950)	15,118	93,688
Total URA(D) on securities arising during the period	(71,298)	72,747	(180,439)
Foreign currency translation adjustments	121,917	(55,341)	(111,530)
Benefit plan actuarial net gain (loss) for the period	1,027	(7,488)	5,681
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	5,477	5,073	6,216
Total benefit plan net gain (loss) for the period	6,504	(2,415)	11,897
Total other comprehensive income (loss), net of tax	57,123	14,991	(280,072)
COMPREHENSIVE INCOME (LOSS)	$ 526,091	$ 1,011,335	$ 697,797
EARNINGS PER COMMON SHARE:
Basic	$ 11.43	$ 23.85	$ 22.29
Diluted	11.36	23.68	22.10
Dividends declared	$ 5.05	$ 4.7	$ 4

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Shares At Cost [Member]	Total
Balance, beginning of period, shares at Dec. 31, 2014	44,685,637
Issued during the period, shares	270,477
Treasury shares acquired, shares	(2,261,862)
Balance, beginning of period at Dec. 31, 2014	$ 683	$ 2,068,807	$ 48,317	$ 7,819,210	$ (2,485,897)
Issued during the period, net	$ 3
Share-based compensation plans		34,831
Net increase (decrease) during the period			(280,072)			$ (280,072)
Net income (loss)				977,869		977,869
Dividends declared ($5.05 per share in 2017, and $4.70 per share in 2016, and $4.00 per share in 2015)				(175,107)		(175,107)
Purchase of treasury shares					(400,059)
Balance, end of period, shares at Dec. 31, 2015	42,694,252
Balance, end of period at Dec. 31, 2015	$ 686	2,103,638	(231,755)	8,621,972	(2,885,956)	7,608,585
Issued during the period, shares	264,313
Treasury shares acquired, shares	(2,059,701)
Issued during the period, net	$ 3
Share-based compensation plans		37,145
Net increase (decrease) during the period			14,991			14,991
Net income (loss)				996,344		996,344
Dividends declared ($5.05 per share in 2017, and $4.70 per share in 2016, and $4.00 per share in 2015)				(195,384)		$ (195,384)
Purchase of treasury shares					(386,288)
Balance, end of period, shares at Dec. 31, 2016	40,898,864					68,871,000
Balance, end of period at Dec. 31, 2016	$ 689	2,140,783	(216,764)	9,422,932	(3,272,244)	$ 8,075,396
Issued during the period, 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)				468,968		468,968
Dividends declared ($5.05 per share in 2017, and $4.70 per share in 2016, and $4.00 per share in 2015)				(207,242)		$ (207,242)
Purchase of treasury shares					(50,000)
Balance, end of period, shares at Dec. 31, 2017	40,835,272					69,044,000
Balance, end of period at Dec. 31, 2017	$ 691	$ 2,165,768	(160,891)	9,685,908	$ (3,322,244)	$ 8,369,232
Reclass due to early adoption of Accounting Standards Update 2018-02			$ (1,250)	$ 1,250		$ 1,250

Consolidated Statements Of Cha6

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 5.05	$ 4.7	$ 4

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 468,968	$ 996,344	$ 977,869
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(338,335)	(15,655)	(98,211)
Decrease (increase) in funds held by reinsureds, net	(31,104)	22,219	(43,775)
Decrease (increase) in reinsurance receivables	(238,485)	(202,950)	(265,103)
Decrease (increase) in income taxes	(114,521)	54,526	(36,771)
Decrease (increase) in prepaid reinsurance premiums	(86,049)	(32,455)	(21,819)
Increase (decrease) in reserve for losses and loss adjustment expenses	1,376,321	545,967	394,167
Increase (decrease) in future policy benefit reserve	(4,060)	(3,836)	(910)
Increase (decrease) in unearned premiums	401,174	(22,072)	(96,950)
Increase (decrease) in other net payable to reinsurers	10,071	26,200	43,727
Increase (decrease) in losses in course of payment	(105,371)	(45,933)	(43,964)
Change in equity adjustments in limited partnerships	(82,713)	(37,939)	(12,965)
Distribution of limited partnership income	50,825	62,008	53,984
Change in other assets and liabilities, net	(66,998)	(45,605)	2,671
Non-cash compensation expense	30,297	26,398	21,237
Amortization of bond premium (accrual of bond discount)	45,867	49,167	50,901
Net realized capital (gains) losses	(153,194)	7,216	184,147
Net cash provided by (used in) operating activities	1,162,693	1,383,600	1,108,235
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	2,160,298	1,919,808	2,144,930
Proceeds from fixed maturities sold - available for sale, at market value	2,401,844	1,258,434	1,724,093
Proceeds from fixed maturity sold - available for sale, at fair value		5,837	1,824
Proceeds from equity securities sold - available for sale, at market value	19,574	6,423	28,936
Proceeds from equity securities sold - available for sale, at fair value	631,859	723,359	614,044
Distributions from other invested assets	5,579,043	4,823,484	57,201
Proceeds from sale of subsidiary (net of cash disposed)		47,721	3,934
Cost of fixed maturities acquired - available for sale, at market value	(5,131,098)	(4,061,896)	(4,718,303)
Cost of fixed maturities acquired - available for sale, at fair value		(3,940)	(2,436)
Cost of equity securities acquired - available for sale, at market value	(22,033)	(12,538)	(10,850)
Cost of equity securities acquired - available for sale, at fair value	(438,641)	(346,929)	(556,889)
Cost of other invested assets acquired	(5,829,271)	(5,396,001)	(286,599)
Net change in short-term investments	(73,923)	368,977	341,733
Net change in unsettled securities transactions	(30,229)	9,388	(22,719)
Net cash provided by (used in) investing activities	(732,577)	(657,873)	(681,101)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period for share-based compensation, net of expense	(5,310)	10,751	13,597
Purchase of treasury shares	(50,000)	(386,288)	(400,059)
Dividends paid to shareholders	(207,242)	(195,384)	(175,107)
Cost of shares withheld for taxes on settlements of share-based compensation awards	(12,906)	(10,595)	(11,601)
Net cash provided by (used in) financing activities	(275,458)	(581,516)	(573,170)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(1,513)	54,053	(7,780)
Net increase (decrease) in cash	153,145	198,264	(153,816)
Cash, beginning of period	481,922	283,658	437,474
Cash, end of period	635,067	481,922	283,658
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	53,743	42,636	164,856
Interest paid	$ 32,194	$ 36,010	$ 35,973

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
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. During the fourth quarter of 2017, the Company established a new Irish insurance subsidiary, Everest Insurance Ireland, designated activity company ("Ireland Insurance"), which will write insurance business mainly in the European markets. During the third quarter of 2016, the Company established domestic subsidiaries, Everest Premier Insurance Company ("Everest Premier") and Everest Denali Insurance Company ("Everest Denali"), which are used in the continued expansion of the Insurance operations. Effective August 24, 2016, the Company sold its wholly-owned subsidiary, Heartland Crop Insurance Company ("Heartland"), a managing agent for crop insurance, to CGB Diversified Services, Inc. ("CGB"). The operating results of Heartland through August 24, 2016, are included within the Company's financial statements. Effective July 1, 2016, the Company established a new Irish holding company, Everest Dublin Insurance Holdings Limited (Ireland) ("Everest Dublin Holdings"). During the fourth quarter of 2015, the Company established new subsidiaries, Everest Preferred International Holdings, Ltd. ("Preferred International"), a Bermuda based company and Everest International Holdings (Bermuda), Ltd. ("International Holdings"), a Bermuda based company. These new subsidiaries were part of a capital restructuring within the Company to support a planned increase in international business production, which includes directly supporting Group's Lloyd's of London Syndicate corporate member. Effective July 13, 2015, the Company sold all of the outstanding shares of capital stock of a wholly-owned subsidiary entity, Mt. McKinley Insurance Company ("Mt. McKinley"), to Clearwater Insurance Company. The operating results of Mt. McKinley through July 13, 2015 are included within the Company's financial statements. Effective February 27, 2013, the Company established a new subsidiary, Mt. Logan Reinsurance Limited ("Mt. Logan Re"). Mt. Logan Re manages separate segregated accounts whose assets and capital relate mainly to third party external investors. The segregated account activities related to third party external investors are not included as part of the Company's financial statements. 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., International Holdings, Everest Corporate Member Limited, Everest Service Company (UK), 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 Holdings, Ireland Insurance, Everest Reinsurance Company (Ireland), designated activity company ("Ireland Re"), Everest Reinsurance Holdings, Inc. ("Holdings"), Heartland, 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., Workcare Southeast of Georgia, Inc., 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, 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 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" 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 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 2017 presentation. B. Investments. Fixed maturity and equity security 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. The Company carries all of its equity securities at fair value except for mutual fund investments whose underlying investments are comprised of fixed maturity securities. For equity securities, available for sale, 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, an investment manager's valuation committee 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, a private placement liquidity sweep facility and rabbi trusts. Cash contributions to and cash distributions from the sweep facility are 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) 2017 2016 Reinsurance receivables and premium receivables $ 23,473 $ 23,360 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) 2017 2016 2015 Deferred acquisition costs $ 1,303,963 $ 1,188,692 $ 1,183,646 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. Payout annuity premiums are recognized as revenue over the premium-paying period of the policies. 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 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) 2017 2016 2015 Net income (loss) per share: Numerator Net income (loss) $ 468,968 $ 996,344 $ 977,869 Less: dividends declared-common shares and nonvested common shares (207,242 ) (195,384 ) (175,107 ) Undistributed earnings 261,725 800,960 802,762 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 258,952 792,415 794,309 Add: dividends declared-common shareholders 205,182 193,413 173,367 Numerator for basic and diluted earnings per common share $ 464,134 $ 985,829 $ 967,676 Denominator Denominator for basic earnings per weighted-average common shares 40,595 41,329 43,415 Effect of dilutive securities: Options 248 300 380 Denominator for diluted earnings per adjusted weighted-average common shares 40,843 41,628 43,795 Per common share net income (loss) Basic $ 11.43 $ 23.85 $ 22.29 Diluted $ 11.36 $ 23.68 $ 22.10 (1) Basic weighted-average common shares outstanding 40,595 41,329 43,415 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 41,030 41,774 43,877 Percentage allocated to common shareholders 98.9 % 98.9 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no All outstanding options expire on or between February 20, 2018 September 19, 2022 L. Segmentation. The Company, through its subsidiaries, operates in four M. Derivatives. The Company sold seven two One June 9, 2017 no 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 2017 2016 Equity index put option contracts Equity index put option liability $ 12,477 $ 22,059 Total $ 12,477 $ 22,059 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) Derivatives not designated as Location of gain (loss) in statements of For the Years Ended December 31, hedging instruments operations and comprehensive income (loss) 2017 2016 2015 Equity index put option contracts Net derivative gain (loss) $ 9,581 $ 18,647 $ 6,317 Total $ 9,581 $ 18,647 $ 6,317 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 Deferred Taxes in Accumulated Other Comprehensive Income (AOCI). 35 21 1,250 Accounting for Impact on Income Taxes due to Tax Reform. Amortization of Bond Premium. Presentation and Disclosure of Net Periodic Benefit Costs. Disclosure of Restricted Cash. Intra-Entity Asset Transfers. Valuation of Financial Instruments. Accounting for Share-Based Compensation. The following table presents certain financial statement line items as previously reported in 2016 and 2015, the effect of those line items due to treating the cost of shares withheld upon settlement of share-based compensation awards as a financing activity with the Statements of Cash Flows and the line items as currently reported within the financial statements. Years Ended December 31, Consolidated Statements of Cash Flows: 2016 2015 Effect of Effect of adoption of adoption of As previously new accounting As previously new accounting reported policy As adopted reported policy As adopted (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Change in other assets and liabilities, net $ (56,204 ) $ 10,595 $ (45,609 ) $ (8,934 ) $ 11,601 $ 2,667 Net cash provided by (used in) operating activities 1,373,005 10,595 1,383,600 1,096,634 11,601 1,108,235 CASH FLOWS FROM FINANCING ACTIVITIES: Cost of shares withheld for taxes on settlements of share-based compensation awards - (10,595 ) (10,595 ) - (11,601 ) (11,601 ) Net cash provided by (used in) financing activities (570,921 ) (10,595 ) (581,516 ) (561,569 ) (11,601 ) (573,170 ) Leases. Recognition and Measurement of Financial Instruments. Disclosures about Short-Duration Contracts. Disclosures for Investments in Certain Entities that Calculate Net Asset Value Per Share. Debt Issuance Costs. Consolidation. The following tables present certain financial statement line items as previously reported in 2015, the effect on those line items due to not consolidating the segregated accounts of Mt. Logan Re, in accordance with the newly adopted accounting policy and the line items as currently reported within the financial statements. CONSOLIDATED BALANCE SHEET: December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted ASSETS: Short-term investments $ 1,795,455 $ (995,771 ) $ 799,684 Total investments and cash 17,672,176 (995,771 ) 16,676,405 Premiums receivable 1,479,293 3,797 1,483,090 Reinsurance receivables 840,420 53,617 894,037 Deferred acquisition costs 373,072 (721 ) 372,351 Prepaid reinsurance premiums 157,424 7,547 164,971 Other assets 265,634 56,184 321,818 TOTAL ASSETS 21,426,175 (875,347 ) 20,550,828 LIABILITIES: Funds held under reinsurance treaties 88,544 (75,000 ) 13,544 Commission reserves 79,849 (19,751 ) 60,098 Other net payable to reinsurers 166,822 6,265 173,087 Other liabilities 291,322 (30,000 ) 261,322 Total liabilities 13,060,729 (118,486 ) 12,942,243 NONCONTROLLING INTERESTS: Redeemable noncontrolling interests - Mt. Logan Re 756,861 (756,861 ) - TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY 21,426,175 (875,347 ) 20,550,828 CONSOLIDATED STATEMENTS OF OPERATIONS Twelve Months Ended December 31, 2015 AND COMPREHENSIVE INCOME (LOSS): Effect of adoption of As previously new accounting reported policy As adopted (Dollars in thousands) REVENUES: Premiums earned $ 5,481,459 $ (188,617 ) $ 5,292,842 Net investment income 473,825 (352 ) 473,473 Other income (expense) 60,435 27,845 88,280 Total revenues 5,837,889 (161,124 ) 5,676,765 CLAIMS AND EXPENSES: Incurred losses and loss adjustment expenses 3,101,915 (37,200 ) 3,064,715 Commission, brokerage, taxes and fees 1,202,036 (18,390 ) 1,183,646 Other underwriting expenses 265,984 (8,915 ) 257,069 Total claims and expenses 4,629,380 (64,505 ) 4,564,875 INCOME (LOSS) BEFORE TAXES 1,208,509 (96,619 ) 1,111,890 NET INCOME (LOSS) 1,074,488 (96,619 ) 977,869 Net income (loss) attributable to noncontrolling interests (96,619 ) 96,619 - NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP 977,869 (977,869 ) - CONSOLIDATED STATEMENT OF CASH FLOWS: Twelve Months Ended December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 1,074,488 $ (96,619 ) $ 977,869 Decrease (increase) in premiums receivable (93,837 ) (4,374 ) (98,211 ) Decrease (increase) in funds held by reinsureds, net 31,225 (75,000 ) (43,775 ) Decrease (increase) in reinsurance receivables (240,414 ) (24,689 ) (265,103 ) Decrease (increase) in prepaid reinsurance premiums (14,486 ) (7,333 ) (21,819 ) Increase (decrease) in other net payable to reinsurers 38,262 5,465 43,727 Change in other assets and liabilities, net 264 (9,198 ) (8,934 ) Net cash provided by (used in) operating activities 1,308,382 (211,748 ) 1,096,634 CASH FLOWS FROM INVESTING ACTIVITIES: Net change in short-term investments (98,903 ) 440,636 341,733 Net cash provided by (used in) investing activities (1,121,737 ) 440,636 (681,101 ) CASH FLOWS FROM FINANCING ACTIVITIES: Third party investment in redeemable noncontrolling interest 266,848 (266,848 ) - Subscription advances for third party redeemable noncontrolling interest 30,000 (30,000 ) - Dividends paid on third party investment in redeemable noncontrolling interest (68,158 ) 68,158 - Net cash provided by (used in) financing activities (332,879 ) (228,690 ) (561,569 ) EFFECT OF EXCHANGE RATE CHANGES ON CASH (7,582 ) (198 ) (7,780 ) Revenue Recognition. Any issued guidance and pronouncements, other than those directly references above, are deemed by the Company to be either not applicable or immaterial to its financial statements.

Investments

Investments	12 Months Ended
	Dec. 31, 2017
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, 2017 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 $ 1,540,952 $ 9,816 $ (14,076 ) $ 1,536,692 $ - Obligations of U.S. states and political subdivisions 563,790 22,123 (444 ) 585,469 - Corporate securities 5,658,456 81,724 (41,175 ) 5,699,005 2,488 Asset-backed securities 532,473 869 (1,982 ) 531,360 - Mortgage-backed securities Commercial 235,794 616 (2,369 ) 234,041 - Agency residential 2,236,361 10,379 (35,838 ) 2,210,902 - Non-agency residential 497 41 (44 ) 494 - Foreign government securities 1,305,070 43,804 (34,847 ) 1,314,027 178 Foreign corporate securities 2,616,205 77,045 (48,406 ) 2,644,844 950 Total fixed maturity securities $ 14,689,598 $ 246,417 $ (179,181 ) $ 14,756,834 $ 3,616 Equity securities $ 130,287 $ 2,615 $ (3,372 ) $ 129,530 $ - At December 31, 2016 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 $ 1,115,208 $ 20,410 $ (5,303 ) $ 1,130,315 $ - Obligations of U.S. states and political subdivisions 723,938 18,016 (11,970 ) 729,984 - Corporate securities 5,059,388 131,651 (35,758 ) 5,155,281 7,936 Asset-backed securities 488,824 1,110 (1,286 ) 488,648 - Mortgage-backed securities Commercial 308,827 1,983 (3,878 ) 306,932 - Agency residential 2,415,901 17,478 (27,910 ) 2,405,469 - Non-agency residential 642 44 (45 ) 641 - Foreign government securities 1,254,175 61,226 (57,241 ) 1,258,160 115 Foreign corporate securities 2,565,710 130,714 (64,446 ) 2,631,978 1,184 Total fixed maturity securities $ 13,932,613 $ 382,632 $ (207,837 ) $ 14,107,408 $ 9,235 Equity securities $ 129,553 $ 2,298 $ (12,784 ) $ 119,067 $ - (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, 2017 At December 31, 2016 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,041,885 $ 1,050,094 $ 956,945 $ 966,970 Due after one year through five years 7,545,731 7,554,248 6,769,585 6,870,056 Due after five years through ten years 2,214,473 2,231,456 2,020,215 2,052,733 Due after ten years 882,384 944,239 971,674 1,015,959 Asset-backed securities 532,473 531,360 488,824 488,648 Mortgage-backed securities: Commercial 235,794 234,041 308,827 306,932 Agency residential 2,236,361 2,210,902 2,415,901 2,405,469 Non-agency residential 497 494 642 641 Total fixed maturity securities $ 14,689,598 $ 14,756,834 $ 13,932,613 $ 14,107,408 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) 2017 2016 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ (101,940 ) $ 85,972 Fixed maturity securities, other-than-temporary impairment (5,618 ) 7,734 Equity securities 9,730 2,845 Other invested assets 3,037 60 Change in unrealized appreciation (depreciation), pre-tax (94,791 ) 96,611 Deferred tax benefit (expense) 21,905 (22,075 ) Deferred tax benefit (expense), other-than-temporary impairment (1,588 ) (1,789 ) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ (71,298 ) $ 72,747 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 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. The majority of the Company's equity securities available for sale at market value are primarily comprised of mutual fund investments whose underlying securities consist of fixed maturity securities. When a fund's value reflects an unrealized loss, the Company assesses whether the decline in value is temporary or other-than-temporary. In making its assessment, the Company considers the composition of its portfolios and their related markets, reports received from the portfolio managers and discussions with portfolio managers. If the Company determines that the declines are temporary and it has the ability and intent to continue to hold the investments, then the declines are recorded as unrealized losses in accumulated other comprehensive income (loss). If declines are deemed to be other-than-temporary, then the carrying value of the investment is written down to fair value and recorded in net realized capital gains (losses) in the Company's consolidated statements of operations and comprehensive income (loss). 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, 2017 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 $ 1,077,051 $ (8,380 ) $ 224,189 $ (5,696 ) $ 1,301,240 $ (14,076 ) Obligations of U.S. states and political subdivisions 4,400 (27 ) 37,886 (417 ) 42,286 (444 ) Corporate securities 1,779,292 (24,942 ) 700,098 (16,233 ) 2,479,390 (41,175 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities Commercial 101,821 (572 ) 64,272 (1,797 ) 166,093 (2,369 ) Agency residential 610,941 (4,836 ) 1,343,547 (31,002 ) 1,954,488 (35,838 ) Non-agency residential - - 69 (44 ) 69 (44 ) Foreign government securities 327,790 (12,811 ) 331,432 (22,036 ) 659,222 (34,847 ) Foreign corporate securities 691,865 (19,381 ) 450,860 (29,025 ) 1,142,725 (48,406 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) Equity securities - - 113,506 (3,372 ) 113,506 (3,372 ) Total $ 4,894,476 $ (72,416 ) $ 3,338,639 $ (110,137 ) $ 8,233,115 $ (182,553 ) Duration of Unrealized Loss at December 31, 2017 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 $ 247,927 $ (962 ) $ 206,113 $ (7,643 ) $ 454,040 $ (8,605 ) Due in one year through five years 2,930,977 (42,480 ) 1,200,414 (52,143 ) 4,131,391 (94,623 ) Due in five years through ten years 612,702 (20,154 ) 292,245 (12,680 ) 904,947 (32,834 ) Due after ten years 88,792 (1,945 ) 45,693 (941 ) 134,485 (2,886 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities 712,762 (5,408 ) 1,407,888 (32,843 ) 2,120,650 (38,251 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2017 were $ 8,233,115 182,553 8.9 72,416 68,107 106,765 103,739 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, 2016 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 $ 638,740 $ (5,303 ) $ - $ - $ 638,740 $ (5,303 ) Obligations of U.S. states and political subdivisions 221,088 (11,486 ) 564 (484 ) 221,652 (11,970 ) Corporate securities 1,360,743 (24,023 ) 177,153 (11,735 ) 1,537,896 (35,758 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities Commercial 143,554 (3,223 ) 7,184 (655 ) 150,738 (3,878 ) Agency residential 1,618,372 (22,461 ) 189,665 (5,449 ) 1,808,037 (27,910 ) Non-agency residential - - 113 (45 ) 113 (45 ) Foreign government securities 360,289 (12,041 ) 236,820 (45,200 ) 597,109 (57,241 ) Foreign corporate securities 687,599 (12,769 ) 295,500 (51,677 ) 983,099 (64,446 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) Equity securities - - 105,507 (12,784 ) 105,507 (12,784 ) Total $ 5,180,408 $ (91,871 ) $ 1,031,292 $ (128,750 ) $ 6,211,700 $ (220,621 ) F-21 Duration of Unrealized Loss at December 31, 2016 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 $ 178,281 $ (1,122 ) $ 78,153 $ (14,318 ) $ 256,434 $ (15,440 ) Due in one year through five years 2,123,113 (26,263 ) 538,130 (84,803 ) 2,661,243 (111,066 ) Due in five years through ten years 680,334 (22,555 ) 86,631 (8,754 ) 766,965 (31,309 ) Due after ten years 286,731 (15,682 ) 7,123 (1,221 ) 293,854 (16,903 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities 1,761,926 (25,684 ) 196,962 (6,149 ) 1,958,888 (31,833 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2016 were $ 6,211,700 220,621 1.1 91,871 85,078 115,966 112,132 no The components of net investment income are presented in the table below for the periods indicated: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Fixed maturities $ 427,379 $ 410,337 $ 433,097 Equity securities 34,523 40,707 45,617 Short-term investments and cash 4,177 1,769 1,225 Other invested assets Limited partnerships 83,569 38,647 14,431 Other 10,125 2,852 1,804 Gross investment income before adjustments 559,773 494,312 496,174 Funds held interest income (expense) 11,874 7,853 10,767 Future policy benefit reserve income (expense) (1,282 ) (1,633 ) (1,907 ) Gross investment income 570,365 500,532 505,034 Investment expenses (27,467 ) (27,447 ) (31,561 ) Net investment income $ 542,898 $ 473,085 $ 473,473 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 $ 646,645 The Company's other invested assets at December 31, 2017 and 2016 included $ 447,915 378,862 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) 2017 2016 2015 Fixed maturity securities, market value: Other-than-temporary impairments $ (7,093 ) $ (31,595 ) $ (102,199 ) Gains (losses) from sales 17,714 6,918 (22,310 ) Fixed maturity securities, fair value: Gains (losses) from sales - (1,586 ) 24 Gains (losses) from fair value adjustments - 1,381 (44 ) Equity securities, market value: Gains (losses) from sales (3,424 ) 1,426 (6,702 ) Equity securities, fair value: Gains (losses) from sales 6,969 (13,442 ) (7,305 ) Gains (losses) from fair value adjustments 138,973 57,686 (45,627 ) Sale of Subsidiary - (28,032 ) - Other invested assets 61 18 - Short-term investments gain (loss) (6 ) 10 16 Total net realized capital gains (losses) $ 153,194 $ (7,216 ) $ (184,147 ) 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) 2017 2016 2015 Proceeds from sales of fixed maturity securities $ 2,401,844 $ 1,264,271 $ 1,725,917 Gross gains from sales 58,589 53,093 47,899 Gross losses from sales (40,875 ) (47,761 ) (70,185 ) Proceeds from sales of equity securities $ 651,433 $ 729,782 $ 642,980 Gross gains from sales 24,809 18,462 27,675 Gross losses from sales (21,264 ) (30,478 ) (41,682 ) Securities with a carrying value amount of $ 1,482,707

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	12 Months Ended
	Dec. 31, 2017
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: At December 31, (Dollars in thousands) 2017 2016 2015 Gross reserves at January 1 $ 10,312,313 $ 9,951,798 $ 9,720,813 Less reinsurance recoverables (990,862 ) (881,503 ) (655,095 ) Net reserves at January 1 9,321,451 9,070,295 9,065,718 Incurred related to: Current year 4,815,967 3,434,964 3,129,744 Prior years (293,386 ) (295,335 ) (65,029 ) Total incurred losses and LAE 4,522,581 3,139,629 3,064,715 Paid related to: Current year 1,280,605 745,642 690,030 Prior years 2,062,634 2,042,972 2,180,076 Total paid losses and LAE 3,343,239 2,788,614 2,870,106 Foreign exchange/translation adjustment 170,879 (99,859 ) (190,032 ) Net reserves at December 31 10,671,672 9,321,451 9,070,295 Plus reinsurance recoverables 1,212,649 990,862 881,503 Gross reserves at December 31 $ 11,884,321 $ 10,312,313 $ 9,951,798 Current year incurred losses were $4,815,967 thousand at December 31, 2017 compared to $3,434,964 thousand at December 31, 2016. The increase in current year incurred losses was primarily due to $ 1,502,511 221,787 Incurred prior years' reserves decreased by $ 293,386 295,335 65,029 238,378 37,137 55,007 The decrease for 2016 was attributable to favorable development in the reinsurance segments of $ 468,749 53,909 60,000 16,720 43,280 173,414 The decrease for 2015 was attributable to favorable development in the reinsurance segments of $ 217,169 152,140 The following is information about incurred and paid claims development as of December 31, 2017, 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, 2016 is presented as supplementary information. These tables present six 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, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 401,208 $ 396,348 $ 329,918 $ 326,226 $ 322,346 $ 322,565 46,925 N/A 2013 311,205 388,852 386,448 389,284 373,749 93,170 N/A 2014 367,685 384,036 392,897 376,147 135,094 N/A 2015 326,444 354,411 346,598 163,674 N/A 2016 330,385 345,872 221,582 N/A 2017 337,220 272,301 N/A $ 2,102,152 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 10,106 $ 38,799 $ 83,546 $ 144,228 $ 188,127 $ 219,687 2013 14,966 49,254 109,285 171,491 212,063 2014 18,903 54,460 110,545 164,958 2015 19,959 53,707 107,130 2016 18,941 58,329 2017 25,807 $ 787,973 All outstanding liabilities prior to 2012, net of reinsurance 945,365 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,259,543 (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 Casualty 5.2% 9.7% 15.1% 16.5% 12.1% 9.8% U.S. Reinsurance – Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 938,601 $ 725,098 $ 623,648 $ 610,631 $ 610,276 $ 606,657 16,054 N/A 2013 622,938 549,240 496,089 457,205 450,155 3,744 N/A 2014 641,956 551,402 474,834 439,279 10,087 N/A 2015 679,721 544,879 489,437 43,074 N/A 2016 966,781 792,187 109,698 N/A 2017 1,586,271 546,690 N/A $ 4,363,986 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 242,627 $ 403,010 $ 494,159 $ 530,630 $ 548,146 $ 565,001 2013 234,991 323,776 382,559 406,717 421,086 2014 218,933 322,307 370,796 396,820 2015 226,696 328,079 389,975 2016 286,444 552,545 2017 573,713 $ 2,899,139 All outstanding liabilities prior to 2012, net of reinsurance 60,784 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,525,631 (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 Property 40.4% 27.1% 13.1% 5.8% 3.0% 2.8% International – Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 227,948 $ 150,293 $ 139,412 $ 139,717 $ 122,272 $ 124,525 15,504 N/A 2013 188,025 172,834 170,467 150,865 148,265 28,514 N/A 2014 199,941 192,814 174,864 173,512 48,051 N/A 2015 197,518 183,842 179,038 65,441 N/A 2016 187,347 185,209 99,564 N/A 2017 194,925 143,028 N/A $ 1,005,474 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 19,429 $ 31,226 $ 47,743 $ 58,671 $ 68,806 $ 80,760 2013 18,472 42,905 57,067 70,853 79,808 2014 26,813 46,921 65,505 77,474 2015 25,231 50,706 72,943 2016 27,391 53,345 2017 27,791 $ 392,120 All outstanding liabilities prior to 2012, net of reinsurance 145,624 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 758,977 (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 Casualty 14.4% 13.3% 11.4% 8.2% 7.0% 9.6% International – Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 573,735 $ 528,305 $ 476,043 $ 479,524 $ 479,764 $ 480,506 1,408 N/A 2013 505,569 456,098 419,238 411,751 411,244 1,572 N/A 2014 599,886 546,124 501,195 445,950 7,250 N/A 2015 572,741 442,366 442,460 21,359 N/A 2016 538,515 509,642 72,123 N/A 2017 909,349 322,168 N/A $ 3,199,151 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 206,138 $ 336,226 $ 406,317 $ 430,935 $ 444,579 $ 455,715 2013 139,602 279,575 334,994 366,226 380,369 2014 167,362 291,893 360,863 393,241 2015 149,495 270,540 341,937 2016 159,858 294,628 2017 280,649 $ 2,146,540 All outstanding liabilities prior to 2012, net of reinsurance 103,727 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,156,337 (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 Property 34.5% 28.4% 14.9% 6.6% 3.1% 2.3% Bermuda – Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 288,697 $ 266,090 $ 245,087 $ 234,742 $ 241,295 $ 242,044 49,365 N/A 2013 231,658 262,083 256,555 265,366 255,034 85,969 N/A 2014 214,950 247,916 265,623 261,968 125,790 N/A 2015 282,046 309,169 314,580 150,231 N/A 2016 300,633 358,834 210,524 N/A 2017 362,365 286,954 N/A $ 1,794,825 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 13,377 $ 30,638 $ 52,690 $ 77,461 $ 104,005 $ 132,402 2013 17,517 34,814 53,401 78,677 104,610 2014 13,929 25,538 43,779 69,033 2015 14,318 62,136 96,964 2016 48,492 87,950 2017 31,158 $ 522,117 All outstanding liabilities prior to 2012, net of reinsurance 478,609 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,751,317 (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 Casualty 7.7% 9.3% 8.7% 9.9% 10.6% 11.7% Bermuda – Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 242,489 $ 184,894 $ 169,173 $ 164,846 $ 165,056 $ 165,817 737 N/A 2013 211,458 153,464 136,667 127,106 126,436 399 N/A 2014 185,865 164,884 138,821 135,607 2,741 N/A 2015 196,374 162,783 149,996 12,333 N/A 2016 211,265 180,278 52,012 N/A 2017 405,011 254,550 N/A $ 1,163,145 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 46,925 $ 87,774 $ 119,980 $ 146,835 $ 153,521 $ 156,471 2013 32,790 71,070 112,539 119,844 121,912 2014 29,932 86,034 106,632 127,117 2015 34,305 75,459 114,061 2016 27,748 79,795 2017 40,462 $ 639,818 All outstanding liabilities prior to 2012, net of reinsurance 41,326 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 564,654 (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 Property 18.2% 30.1% 23.0% 12.8% 3.0% 1.8% Insurance – Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 349,831 $ 351,636 $ 347,165 $ 348,331 $ 353,459 $ 344,074 30,569 15,956 2013 393,819 393,629 393,066 393,209 351,451 43,549 20,755 2014 431,503 457,475 455,004 461,061 132,391 25,009 2015 520,192 528,841 536,494 207,887 26,472 2016 554,546 556,966 276,184 30,384 2017 618,939 474,699 26,419 $ 2,868,985 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 33,202 $ 101,311 $ 157,947 $ 213,520 $ 246,496 $ 272,165 2013 33,317 117,054 176,338 224,652 260,257 2014 41,197 124,955 201,725 256,954 2015 44,322 134,787 219,105 2016 54,747 164,415 2017 53,926 $ 1,226,821 All outstanding liabilities prior to 2012, net of reinsurance 492,565 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,134,728 (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 Casualty 9.1% 19.4% 16.4% 13.8% 9.9% 7.5% Insurance – Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 106,397 $ 89,072 $ 81,797 $ 82,500 $ 82,068 $ 81,851 52 N/A 2013 112,122 98,290 91,407 92,292 92,381 509 N/A 2014 131,817 123,811 120,044 119,576 1,064 N/A 2015 173,196 153,145 144,202 (1,388 ) N/A 2016 303,241 276,110 (612 ) N/A 2017 526,318 186,608 N/A $ 1,240,439 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 56,508 $ 81,820 $ 80,519 $ 81,800 $ 81,940 $ 81,731 2013 68,726 93,241 91,989 92,259 91,868 2014 81,875 116,135 118,327 118,323 2015 102,300 141,494 142,670 2016 162,930 250,221 2017 206,938 $ 891,750 All outstanding liabilities prior to 2012, net of reinsurance 1,258 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 349,948 (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 Property 63.5% 29.5% 0.2% 0.5% -0.1% -0.3% 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, 2017 (Dollars in thousands) Net outstanding liabilities U.S. Reinsurance Casualty $ 2,259,543 U.S. Reinsurance Property 1,525,631 International Casualty 758,977 International Property 1,156,337 Bermuda Casualty 1,751,317 Bermuda Property 564,654 Insurance Casualty 2,134,728 Insurance Property 349,948 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 10,501,136 Reinsurance recoverable on unpaid claims U.S. Reinsurance Casualty 110,852 U.S. Reinsurance Property 192,205 International Casualty 92,937 International Property 116,737 Bermuda Casualty 2,975 Bermuda Property 144,242 Insurance Casualty 492,606 Insurance Property 60,095 Total reinsurance recoverable on unpaid claims 1,212,649 Insurance lines other than short-duration - Unallocated claims adjustment expenses 136,611 Other 33,925 170,536 Total gross liability for unpaid claims and claim adjustment expense $ 11,884,321 (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 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 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) 2017 2016 2015 Gross basis: Beginning of period reserves $ 441,111 $ 433,117 $ 476,205 Incurred losses 90,009 73,336 40,000 Paid losses (82,126 ) (65,342 ) (83,088 ) End of period reserves $ 448,994 $ 441,111 $ 433,117 Net basis: Beginning of period reserves $ 319,072 $ 319,620 $ 458,211 Incurred losses 37,137 53,909 38,440 Paid losses (38,128 ) (54,457 ) (177,031 ) End of period reserves $ 318,081 $ 319,072 $ 319,620 On July 13, 2015, the Company sold Mt. McKinley, a Delaware domiciled insurance company and wholly-owned subsidiary of the Company to Clearwater Insurance Company, a Delaware domiciled insurance company. Concurrently with the closing, the Company entered into a retrocession treaty with an affiliate of Clearwater Insurance Company. Per the retrocession treaty, the Company retroceded 100 140,279 440,279 300,000 Reinsurance Receivables. Reinsurance receivables for both paid and recoverable on unpaid losses totaled $ 1,348,226 1,018,325 356,556 26.4 153,815 11.4 113,922 8.4 98,121 7.3 82,234 6.1 5 Future Policy Benefit Reserve. Activity in the reserve for future policy benefits is summarized for the periods indicated: At December 31, (Dollars in thousands) 2017 2016 2015 Balance at beginning of year $ 55,074 $ 58,910 $ 59,820 Liabilities assumed 115 175 315 Adjustments to reserves (437 ) 303 2,310 Benefits paid in the current year (3,738 ) (4,315 ) (3,535 ) Balance at end of year $ 51,014 $ 55,074 $ 58,910 (Some amounts may not reconcile due to rounding.)

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2017
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. Due to the unavailability of prices for sixty-six sixty-five 165,173 one 51,965 forty-two 86,536 The Company internally manages a public equity portfolio which had a fair value at December 31, 2017 and 2016 of $ 386,241 256,041 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 The Company has five 2 zero 3 400,534 2,673.61 no The Company has one 11 zero 3 41,212 7,687.77 no At December 31, 2017 and 2016, the fair value for these equity put options was $ 12,477 22,059 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, 2017 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,536,692 $ - $ 1,536,692 $ - Obligations of U.S. States and political subdivisions 585,469 - 585,469 - Corporate securities 5,699,005 - 5,488,819 210,186 Asset-backed securities 531,360 - 531,360 - Mortgage-backed securities Commercial 234,041 - 234,041 - Agency residential 2,210,902 - 2,210,902 - Non-agency residential 494 - 494 - Foreign government securities 1,314,027 - 1,314,027 - Foreign corporate securities 2,644,844 - 2,637,892 6,952 Total fixed maturities, market value 14,756,834 - 14,539,696 217,138 Equity securities, market value 129,530 113,506 16,024 - Equity securities, fair value 963,572 941,739 21,833 - Liabilities: Equity index put option contracts $ 12,477 $ - $ - $ 12,477 There were no 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, 2016 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,130,315 $ - $ 1,130,315 $ - Obligations of U.S. States and political subdivisions 729,984 - 729,984 - Corporate securities 5,155,281 - 5,090,084 65,197 Asset-backed securities 488,648 - 488,648 - Mortgage-backed securities Commercial 306,932 - 306,932 - Agency residential 2,405,469 - 2,405,469 - Non-agency residential 641 - 641 - Foreign government securities 1,258,160 - 1,258,160 - Foreign corporate securities 2,631,978 - 2,629,440 2,538 Total fixed maturities, market value 14,107,408 - 14,039,673 67,735 Equity securities, market value 119,067 105,507 13,560 - Equity securities, fair value 1,010,085 949,523 60,562 - Liabilities: Equity index put option contracts $ 22,059 $ - $ - $ 22,059 In addition, $ 79,505 18,801 The following tables present the activity under Level 3, fair value measurements using significant unobservable inputs by asset type, for the periods indicated: December 31, 2017 December 31, 2016 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities CMBS Corporate Total Beginning balance $ 65,197 $ 2,538 $ 67,735 $ 3,933 $ - $ 1,593 $ 5,526 Total gains or (losses) (realized/unrealized) Included in earnings 1,655 356 2,011 100 - (1,193 ) (1,093 ) Included in other comprehensive income (loss) (992 ) 46 (946 ) 41 16 - 57 Purchases, issuances and settlements 144,326 4,800 149,126 63,054 (44 ) 2,138 65,148 Transfers in and/or (out) of Level 3 - (788 ) (788 ) (1,931 ) 28 - (1,903 ) Ending balance $ 210,186 $ 6,952 $ 217,138 $ 65,197 $ - $ 2,538 $ 67,735 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.) The net transfers to/(from) level 3, fair value measurements using significant unobservable inputs were ($ 788 1,903 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) 2017 2016 Liabilities: Balance, beginning of period $ 22,059 $ 40,705 Total (gains) or losses (realized/unrealized) Included in earnings (9,581 ) (18,647 ) Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 12,477 $ 22,059 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, 2017
Credit Facilities [Abstract]
Credit Facilities	5. CREDIT FACILITIES The Company has two 1,050,000 Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Credit facility fees incurred $ 420 $ 793 $ 756 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 800,000 four 800,000 200,000 an adjusted London Interbank Offered Rate ("LIBOR") plus a margin. prime commercial lending rate established by Wells Fargo Bank Federal Funds Rate plus 0.5 one month LIBOR Rate plus 1.0 600,000 The Group Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 5,370,979 25 25 The following table summarizes the outstanding letters of credit and/or borrowings for the periods indicated: (Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 538,214 12/31/2018 600,000 478,233 12/31/2017 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 538,214 $ 800,000 $ 478,233 Bermuda Re Letter of Credit Facility Effective December 29, 2017, 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 $ 250,000 0.35 % per annum of the principal amount of issued standard letters of credit (expiry of 15 months or less) 0.45 % per annum of the principal amount of issued extended tenor letters of credit (expiry maximum of up to 60 months). 0.15 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 250,000 $ 3,297 2/28/2018 $ 200,000 $ 4,058 2/28/2017 3,672 11/24/2018 3,672 11/24/2017 73,626 12/31/2018 69,404 12/31/2017 344 8/30/2019 269 8/30/2018 93,855 12/30/2021 1,163 12/31/2018 - 93,180 12/30/2020 Total Citibank Bilateral Agreement $ 250,000 $ 174,794 $ 200,000 $ 171,746 Everest International Credit Facility Effective November 9, 2016, Everest International renewed its credit facility with Lloyds Bank plc ("Everest International Credit Facility"). The current renewal of the Everest International Credit Facility, along with a May 17, 2017 amendment, has a four 145,000 0.1 0.35 The Everest International Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 5,326,009 70 25 25 5,867,715 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 145,000 £ - £ 140,000 £ 130,606 12/31/2019 - - - - Total Lloyd's Bank Credit Facility £ 145,000 £ - £ 140,000 £ 130,606

Senior Notes

Senior Notes	12 Months Ended
	Dec. 31, 2017
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, 2017 December 31, 2016 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,834 $ 420,340 $ 396,714 $ 383,612 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) 2017 2016 2015 Interest expense incurred $ 19,472 $ 19,472 $ 19,472

Long Term Subordinated Notes

Long Term Subordinated Notes	12 Months Ended
	Dec. 31, 2017
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, 2017 December 31, 2016 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,561 $ 233,072 $ 236,462 $ 204,636 During the fixed rate interest period from May 3, 2007 through May 14, 2017, interest was at the annual rate of 6.6 3.80 Holdings may redeem the long term subordinated notes on or after May 15, 2017, in whole or in part at 100 May 1, 2047 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 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) 2017 2016 2015 Interest expense incurred $ 11,498 $ 15,749 $ 15,749

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	12 Months Ended
	Dec. 31, 2017
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, 2017, the total amount on deposit in trust accounts was $ 822,409 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 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 2017 2016 2015 (Dollars in thousands) Ceded written premiums 228,514 197,537 234,001 Ceded earned premiums 226,505 191,568 226,385 Ceded losses and LAE 323,664 44,802 40,807 Assumed written premiums 11,984 14,563 15,421 Assumed earned premiums 11,984 14,563 15,421 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 $ 837,202 932,243 50,373 58,955 On April 24, 2014, the Company entered into two 250,000 200,000 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 On December 1, 2015 the Company entered into two 300,000 325,000 On April 13, 2017 the Company entered into six three four 225,000 400,000 325,000 three five 50,000 75,000 175,000 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. As of December 31, 2017, none of the published insured loss estimates for the 2017 catastrophe events have exceeded the single event retentions under the terms of the agreements that would result in a recovery. In addition, the aggregation of the to-date published insured loss estimates for the 2017 covered events have not exceeded the aggregated retentions for recovery. However, if the published estimates for insured losses for the covered 2017 events increase, the aggregate losses may exceed the aggregate event retentions under the agreements resulting 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 $ 450,000 500,000 625,000 950,000 300,000

Operating Lease Agreements

Operating Lease Agreements	12 Months Ended
	Dec. 31, 2017
Operating Lease Agreements [Abstract]
Operating Lease Agreements	9 OPERATING LEASE AGREEMENTS The future minimum rental commitments, exclusive of cost escalation clauses, at December 31, 2017, for all of the Company's operating leases with remaining non-cancelable terms in excess of one year are as follows: (Dollars in thousands) 2018 $ 16,990 2019 17,964 2020 17,115 2021 8,035 2022 7,669 Thereafter 24,668 Net commitments $ 92,440 (Some amounts may not reconcile due to rounding.) All of these leases, the expiration terms of which range from 2018 2032 19,490 17,663 15,986

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
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 no 21 35 Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Current tax expense (benefit): U.S. $ (117,173 ) $ 30,971 $ 90,486 Non-U.S. 2,849 4,228 14,811 Total current tax expense (benefit) (114,324 ) 35,199 105,297 Deferred tax expense (benefit): U.S. 49,763 70,995 28,724 Non-U.S. 777 (2,694 ) - Total deferred tax expense (benefit) 50,540 68,301 28,724 Total income tax expense (benefit) $ (63,784 ) $ 103,500 $ 134,021 (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, (Dollars in thousands) 2017 2016 2015 U.S. Non-U.S. U.S. Non-U.S. U.S. Non-U.S. Underwriting gain (loss) $ (516,167 ) $ 308,646 $ 208,821 $ 480,602 $ 294,386 $ 493,025 Net investment income 255,310 287,588 230,691 242,393 234,709 238,763 Net realized capital gains (losses) 148,099 5,095 (16,465 ) 9,249 (159,268 ) (24,879 ) Net derivative gain (loss) - 9,581 - 18,647 - 6,317 Corporate expenses (7,394 ) (18,529 ) (8,276 ) (18,955 ) (7,179 ) (16,075 ) Interest, fee and bond issue cost amortization expense (31,183 ) (420 ) (35,435 ) (793 ) (35,434 ) (756 ) Other income (expense) 30,325 (65,767 ) (5,536 ) (5,101 ) 27,706 60,574 Pre-tax income (loss) $ (121,010 ) $ 526,194 $ 373,801 $ 726,043 $ 354,920 $ 756,970 Expected tax provision at the applicable statutory rate(s) (42,355 ) 6,843 130,830 2,387 124,221 14,848 Increase (decrease) in taxes resulting from: Tax exempt income (8,488 ) - (9,078 ) - (10,004 ) - Dividend received deduction (4,639 ) - (4,913 ) - (5,364 ) - Proration 1,760 - 1,931 - 2,160 - Affiliated preferred stock dividends 10,861 - 10,861 - 13,608 - Creditable foreign premium tax (7,515 ) - (6,134 ) - (7,492 ) - Tax audit settlement (11,516 ) - (18,644 ) - - - Share based compensation tax benefits formerly in APIC (6,716 ) (235 ) - - - - Impact of U.S. tax reform 8,246 - - - - - Impact of prior year accounting adjustment (8,986 ) - - - - - Other 1,938 (2,982 ) (2,887 ) (853 ) 2,081 (37 ) Total income tax provision $ (67,410 ) $ 3,626 $ 101,966 $ 1,534 $ 119,210 $ 14,811 (Some amounts may not reconcile due to rounding.) During 2016, the Internal Revenue Service ("IRS") completed its audit of the Company for 2009 through 2013 tax years and issued a final Revenue Agent Report ("RAR"). The RAR reflected that the IRS owed the Company a net refund for five 43,682 1,252 5,000 The Company's 2014 and subsequent tax years are open to audit by the IRS. In addition, the Company subsequently filed amended tax returns for 2006, 2007, 2008, the RAR years, and 2014 and plans to file amended 2015 and 2016 tax returns for $ 29,385 The Company has no 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. Under the TCJA, temporary differences at December 31, 2017, are now expected to reverse at a 21% tax rate, whereas, at December 31, 2016, such items were expected to reverse at a 35% tax rate. 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) 2017 2016 Deferred tax assets: Unearned premium reserves $ 55,034 $ 37,573 Loss reserves 52,649 104,547 Net unrealized losses on benefit plans 19,120 35,271 Foreign tax credits 15,914 - Benefit plan liability 10,417 14,576 Net operating loss carryforward 9,645 6,341 Uncollectible reinsurance reserves 3,320 5,534 Deferred expenses 1,759 2,884 Unrealized foreign currency losses 1,550 27,410 Investment impairments 1,144 3,093 Alternative minimum tax credits 363 - Other assets 10,494 14,843 Total deferred tax assets 181,409 252,071 Deferred tax liabilities: Deferred acquisition costs 64,997 26,652 Net fair value income 58,983 78,740 Net unrealized investment gains 11,576 20,698 Gain on tender of debt 3,287 10,958 Partnership investments 2,149 11,912 Other liabilities 2,174 3,086 Total deferred tax liabilities 143,165 152,045 Net deferred tax assets 38,244 100,026 Less: Valuation allowance (9,560 ) (3,846 ) Total net deferred tax assets $ 28,684 $ 96,181 (Some amounts may not reconcile due to rounding.) At December 31, 2017, the Company has $ 15,914 363 9,560 3,846 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 enacted by the TCJA. Modifications include the extension of long-tail payment patterns out 24 The Company has made a provisional estimated tax expense of the effects of the TCJA on its deferred tax inventory at December 31, 2017 of $ 8,246 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 $ 6,951 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. In 2016, the Company recorded excess tax benefits of $ 6,861 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 $ 626 597

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2017
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) 2017 2016 2015 Written premiums: Direct $ 2,083,555 $ 1,819,588 $ 1,569,791 Assumed 5,090,367 4,214,286 4,321,922 Ceded (929,261 ) (762,969 ) (709,402 ) Net written premiums $ 6,244,661 $ 5,270,905 $ 5,182,311 Premiums earned: Direct $ 1,825,705 $ 1,694,702 $ 1,491,163 Assumed 4,945,522 4,361,944 4,500,526 Ceded (833,387 ) (736,180 ) (698,847 ) Net premiums earned $ 5,937,840 $ 5,320,466 $ 5,292,842 Incurred losses and LAE: Direct $ 1,311,682 $ 1,496,455 $ 1,268,896 Assumed 3,909,816 2,121,902 2,152,633 Ceded (698,917 ) (478,728 ) (356,814 ) Net incurred losses and LAE $ 4,522,581 $ 3,139,629 $ 3,064,715

Comprehensive Income (Loss)

Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2017
Comprehensive Income (Loss) [Abstract]
Comprehensive Income (Loss)	12. 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, 2017 2016 2015 (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 $ (81,915 ) $ 21,597 $ (60,318 ) $ 65,645 $ (13,961 ) $ 51,684 $ (333,657 ) $ 54,502 $ (279,155 ) URA(D) on securities - OTTI (5,618 ) 1,588 (4,030 ) 7,734 (1,789 ) 5,945 8,411 (3,383 ) 5,028 Reclassification of net realized losses (gains) included in net income (loss) (7,258 ) 308 (6,950 ) 23,232 (8,114 ) 15,118 131,211 (37,523 ) 93,688 Foreign currency translation adjustments 142,054 (20,137 ) 121,917 (53,802 ) (1,539 ) (55,341 ) (140,918 ) 29,388 (111,530 ) Benefit plan actuarial net gain (loss) 1,300 (273 ) 1,027 (11,520 ) 4,032 (7,488 ) 8,740 (3,059 ) 5,681 Reclassification of benefit plan liability amortization included in net income (loss) 8,426 (2,949 ) 5,477 7,805 (2,732 ) 5,073 9,563 (3,347 ) 6,216 Total other comprehensive income (loss) $ 56,989 $ 134 $ 57,123 $ 39,094 $ (24,103 ) $ 14,991 $ (316,650 ) $ 36,578 $ (280,072 ) 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 2017 2016 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ (7,258 ) $ 23,232 Other net realized capital gains (losses) 308 (8,114 ) Income tax expense (benefit) $ (6,950 ) $ 15,118 Net income (loss) Benefit plan net gain (loss) $ 8,426 $ 7,805 Other underwriting expenses (2,949 ) (2,732 ) Income tax expense (benefit) $ 5,477 $ 5,073 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) 2017 2016 Beginning balance of URA (D) on securities $ 115,558 $ 42,811 Current period change in URA (D) of investments - temporary (67,268 ) 66,802 Current period change in URA (D) of investments - non-credit OTTI (4,030 ) 5,945 Reclass due to early adoption of ASU 2018-02 5,709 - Ending balance of URA (D) on securities 49,969 115,558 Beginning balance of foreign currency translation adjustments (266,818 ) (211,477 ) Current period change in foreign currency translation adjustments 121,917 (55,341 ) Reclass due to early adoption of ASU 2018-02 5,970 - Ending balance of foreign currency translation adjustments (138,931 ) (266,818 ) Beginning balance of benefit plan net gain (loss) (65,504 ) (63,089 ) Current period change in benefit plan net gain (loss) 6,504 (2,415 ) Reclass due to early adoption of ASU 2018-02 (12,929 ) - Ending balance of benefit plan net gain (loss) (71,929 ) (65,504 ) Ending balance of accumulated other comprehensive income (loss) $ (160,891 ) $ (216,764 ) (Some amounts may not reconcile due to rounding.)

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
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, effective from October 1995 through December 31, 2017, provided compensating pension benefits for participants whose benefits have been curtailed under the qualified plan due to Internal Revenue Code limitations. 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) 2017 2016 2015 Company contributions $ 10,534 $ 30,821 $ 5,949 The following table summarizes the Company's pension expense for the periods indicated: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Pension expense $ 16,299 $ 17,188 $ 22,682 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) 2017 2016 Change in projected benefit obligation: Benefit obligation at beginning of year $ 281,853 $ 254,022 Service cost 10,949 10,924 Interest cost 10,034 9,485 Actuarial (gain)/loss 24,679 12,155 Curtailment (6,209 ) - Benefits paid (5,104 ) (4,733 ) Projected benefit obligation at end of year 316,202 281,853 Change in plan assets: Fair value of plan assets at beginning of year 171,506 135,087 Actual return on plan assets 33,331 10,331 Actual contributions during the year 10,534 30,821 Administrative expenses paid - - Benefits paid (5,104 ) (4,733 ) Fair value of plan assets at end of year 210,267 171,506 Funded status at end of year $ (105,935 ) $ (110,348 ) (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) 2017 2016 Other assets (due beyond one year) $ - $ - Other liabilities (due within one year) (3,871 ) (2,371 ) Other liabilities (due beyond one year) (102,065 ) (107,977 ) Net amount recognized in the consolidated balance sheets $ (105,935 ) $ (110,348 ) (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) 2017 2016 Prior service cost $ - $ - Accumulated income (loss) (86,788 ) (96,965 ) Accumulated other comprehensive income (loss) $ (86,788 ) $ (96,965 ) (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) 2017 2016 Other comprehensive income (loss) at December 31, prior year $ (96,965 ) $ (91,920 ) Net gain (loss) arising during period (4,398 ) (12,982 ) Recognition of amortizations in net periodic benefit cost: Prior service cost - - Actuarial loss 8,366 7,937 Curtailment loss recognized 6,209 - Other comprehensive income (loss) at December 31, current year $ (86,788 ) $ (96,965 ) (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) 2017 2016 2015 Service cost $ 10,949 $ 10,924 $ 12,511 Interest cost 10,034 9,485 10,759 Expected return on assets (13,050 ) (11,158 ) (11,620 ) Amortization of actuarial loss from earlier periods 8,366 7,937 9,243 Amortization of unrecognized prior service cost - - 21 Settlement - - 1,768 Net periodic benefit cost $ 16,299 $ 17,188 $ 22,682 Other changes recognized in other comprehensive income (loss): Other comprehensive income (loss) attributable to change from prior year (10,177 ) 5,045 Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 6,122 $ 22,233 (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 6,899 0 The weighted average discount rates used to determine net periodic benefit cost for 2017, 2016 and 2015 were 4.16 4.38 4.00 4.00 7.50 The weighted average discount rates used to determine the actuarial present value of the projected benefit obligation for years end 2017, 2016 and 2015 were 3.62 4.16 4.38 The following table summarizes the accumulated benefit obligation for the periods indicated: At December 31, (Dollars in thousands) 2017 2016 Qualified Plan $ 245,430 $ 211,720 Non-qualified Plan 24,482 21,123 Total $ 269,912 $ 232,843 (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) 2017 2016 Qualified Plan Projected benefit obligation $ 291,720 $ 254,320 Fair value of plan assets 210,267 171,506 Non-qualified Plan Projected benefit obligation $ 24,482 $ 27,534 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) 2017 2016 Qualified Plan Accumulated benefit obligation $ 245,430 $ 211,720 Fair value of plan assets 210,267 171,506 Non-qualified Plan Accumulated benefit obligation $ 24,482 $ 21,123 Fair value of plan assets - - The following table displays the expected benefit payments in the periods indicated: (Dollars in thousands) 2018 10,205 2019 10,288 2020 12,452 2021 12,331 2022 12,132 Next 5 years 74,239 Plan assets consist of shares in investment trusts with 76 12 11 1 70 30 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, 2017 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 1,031 $ 1,031 $ - $ - Mutual funds, fair value Fixed income (b) 23,361 23,361 - - Equities (c) 159,578 159,578 - - Total $ 183,970 $ 183,970 $ - $ - (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 50 50 (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 90 10 There were no transfers between Level 1 and Level 2 for the twelve months ended December 31, 2017. Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2016 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 3,665 $ 3,665 $ - $ - Mutual funds, fair value Fixed income (b) 21,445 21,445 - - Equities (c) 122,213 122,213 - - Total $ 147,323 $ 147,323 $ - $ - (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 50% in U.S. securities and 50% 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 90% in U.S. equities and 10% in international equities. In addition, $ 26,297 24,183 The Company contributed $ 10,000 30,000 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 3 8 100 The following table presents the Company's incurred expenses related to these plans for the periods indicated: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Incurred expenses $ 7,167 $ 6,058 $ 5,468 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 4.2 59.4 Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Incurred expenses $ 1,849 $ 1,560 $ 1,423 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. The following medical cost trend rates were used to determine net periodic cost: a healthcare inflation rate for pre-Medicare claims of 7.5 4.5 7.5 4.5 The following medical cost trend rates were used to determine benefit obligations: a healthcare inflation rate for pre-Medicare claims of 7.3 4.5 7.3 4.5 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 $ 614 $ (476 ) b. Effect on accumulated post-retirement benefit obligation 7,313 (5,674 ) The following table presents the post-retirement benefit expenses for the periods indicated: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Post-retirement benefit expenses $ 2,814 $ 2,293 $ 3,280 The following table summarizes the status of this plan for the periods indicated: At December 31, (Dollars in thousands) 2017 2016 Change in projected benefit obligation: Benefit obligation at beginning of year $ 32,071 $ 31,687 Service cost 1,570 1,418 Interest cost 1,184 1,007 Amendments (3,526 ) (794 ) Actuarial (gain)/loss 4,038 (668 ) Benefits paid (619 ) (579 ) Benefit obligation at end of year 34,717 32,071 Change in plan assets: Fair value of plan assets at beginning of year - - Employer contributions 619 579 Benefits paid (619 ) (579 ) Fair value of plan assets at end of year - - Funded status at end of year $ (34,717 ) $ (32,071 ) Amounts recognized in the consolidated balance sheets for the periods indicated: At December 31, (Dollars in thousands) 2017 2016 Other liabilities (due within one year) $ (655 ) $ (614 ) Other liabilities (due beyond one year) (34,062 ) (31,457 ) Net amount recognized in the consolidated balance sheets $ (34,717 ) $ (32,071 ) (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) 2017 2016 Accumulated income (loss) $ (8,317 ) $ (4,471 ) Accumulated prior service credit (cost) 4,057 $ 662 Accumulated other comprehensive income (loss) $ (4,260 ) $ (3,809 ) Other changes in other comprehensive income (loss) for the periods indicated are as follows: Years Ended December 31, (Dollars in thousands) 2017 2016 Other comprehensive income (loss) at December 31, prior year $ (3,809 ) $ (5,139 ) Net gain (loss) arising during period (4,038 ) 668 Prior Service credit (cost) arising during period 3,526 794 Recognition of amortizations in net periodic benefit cost: Actuarial loss (gain) 192 - Prior service cost (131 ) (132 ) Other comprehensive income (loss) at December 31, current year $ (4,260 ) $ (3,809 ) Net periodic benefit cost included the following components for the periods indicated: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Service cost $ 1,570 $ 1,418 $ 1,794 Interest cost 1,184 1,007 1,187 Net loss recognition (131 ) (132 ) 300 Net gain recognition 192 - - Net periodic cost $ 2,814 $ 2,293 $ 3,280 Other changes recognized in other comprehensive income (loss): Other comprehensive gain (loss) attributable to change from prior year 451 (1,330 ) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 3,265 $ 963 (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 (loss) into net periodic benefit cost over the next fiscal year are $ 0 543 577 The weighted average discount rates used to determine net periodic benefit cost for 2017, 2016 and 2015 were 4.16 4.38 4.00 The weighted average discount rates used to determine the actuarial present value of the projected benefit obligation at year end 2017, 2016 and 2015 were 3.62 4.16 4.38 The following table displays the expected benefit payments in the years indicated: (Dollars in thousands) 2018 $ 655 2019 765 2020 877 2021 975 2022 1,156 Next 5 years 7,965

Dividend Restrictions And Statu

Dividend Restrictions And Statutory Financial Information	12 Months Ended
	Dec. 31, 2017
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 Prior approval of the BMA is required if Bermuda Re's dividend payments would exceed 25 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 $ 3,085,882 2,950,517 582,128 666,155 622,571 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) 10 339,185 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 $ 3,391,852 3,635,121 391,419 523,547 498,455 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 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 Commencing in 2017, the regulatory targeted capital required by the State of Delaware, Department of Insurance was expanded to include a provision for catastrophe exposure. This additional requirement added $ 759,762 The regulatory targeted capital and the actual statutory capital for Bermuda Re and Everest Re were as follows: Bermuda Re (1) Everest Re (2) At December 31, At December 31, (Dollars in thousands) 2017 (3) 2016 (3) 2017 2016 Regulatory targeted capital $ - $ 2,025,717 $ 2,076,892 $ 1,411,440 Actual capital $ 3,085,882 $ 2,950,517 $ 3,391,852 $ 3,635,121 (1) Regulatory targeted capital represents the target capital level from the applicable year's BSCR calculation. (2) Regulatory targeted capital represents 200% of the RBC authorized control level calculation for the applicable year. (3) The 2017 BSCR calculation is not yet due to be completed; however, the Company anticipates that Bermuda Re's December 31, 2017 actual capital will exceed the targeted capital level.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2017
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) 2017 2016 The Prudential Insurance Company of America $ 144,618 $ 146,507 Unaffiliated life insurance company 34,444 33,860

Share-Based Compensation Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2017
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 2,553,473 no 37,439 34,957 500,000 346,714 Options and restricted shares granted under the 2010 Employee Plan and the 2002 Employee Plan vest at the earliest of 20 33 ten Performance Share Unit awards granted under the 2010 Employee Plan will vest 100 three 0 1.75 50 three 50 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 $ 30,297 26,398 21,237 14,824 6,898 4,870 For the year ended December 31, 2017, a total of 160,185 234.03 242.225 230.52 229.5425 11,245 234.03 No F-60 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, 2017, 2016 and 2015, the Company recognized $ 626 597 446 A summary of the option activity under the Company's shareholder approved plans as of December 31, 2017, 2016 and 2015, 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, 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 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2016 648,034 $ 85.61 Granted - - Exercised 187,940 87.31 Forfeited/Cancelled/Expired 5,100 88.25 Outstanding at December 31, 2016 454,994 84.88 3.7 $ 59,843 Exercisable at December 31, 2016 410,694 84.50 3.5 $ 54,169 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2015 888,184 $ 86.05 Granted - - Exercised 230,350 87.21 Forfeited/Cancelled/Expired 9,800 87.68 Outstanding at December 31, 2015 648,034 85.61 4.5 $ 64,352 Exercisable at December 31, 2015 495,334 84.94 4.1 $ 49,517 There were no 14,130 19,876 21,434 8,312 4,743 F-61 The following table summarizes information about share options outstanding for the period indicated: At December 31, 2017 Options Outstanding Options Exercisable Weighted- Average Weighted- Weighted- Number Remaining Average Number Average Range of Outstanding Contractual Exercise Exercisable Exercise Exercise Prices at 12/31/17 Life Price at 12/31/17 Price $ 71.7150 78.1700 79,760 1.1 $ 71.72 79,760 $ 71.72 $ 78.1800 85.6300 61,900 2.1 84.63 61,900 84.63 $ 85.6400 87.4700 88,590 3.1 86.62 88,590 86.62 $ 87.4800 89.4100 110,060 4.1 88.32 110,060 88.32 $ 89.4200 110.1300 20,054 1.1 97.41 20,054 97.41 360,364 2.7 84.10 360,364 84.10 The following table summarizes the status of the Company's non-vested shares and changes for the periods indicated: Years Ended December 31, 2017 2016 2015 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, 435,338 $ 164.21 435,336 $ 143.02 467,745 $ 120.84 Granted 160,185 234.01 173,546 186.37 156,262 178.80 Vested 152,397 151.80 145,834 130.54 154,387 113.12 Forfeited 21,865 187.82 27,710 147.32 34,284 138.19 Outstanding at December 31, 421,261 194.01 435,338 164.21 435,336 143.02 As of December 31, 2017, there was $ 56,981 3.1 23,134 19,037 17,464 10,130 In addition to the 2010 Employee Plan, the 2009 Director Plan and the 2003 Director Plan, Group issued 404 547 426 94 103 75 Since its 1995 initial public offering, the Company has issued to certain key employees of the Company 2,141,557 280,452 145,817 no 60,453 70,010 82,277 14,240 12,111 14,666 F-62 The following table summarized the status of the Company's non-vested performance share unit awards and changes for the period indicated: Year Ended December 31, 2017 2016 2015 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, 21,835 $ 182.50 10,705 $ 178.84 - $ - Granted 11,245 234.03 11,130 186.02 10,705 178.84 Vested - - - - - - Forfeited - - - - - - Outstanding at December 31, 33,080 200.02 21,835 182.50 10,705 178.84

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2017
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. F-63 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) 2017 2016 2015 Gross written premiums $ 2,592,972 $ 2,125,792 $ 2,147,892 Net written premiums 2,245,422 1,970,575 1,855,853 Premiums earned $ 2,181,160 $ 2,072,155 $ 1,952,680 Incurred losses and LAE 1,632,795 1,068,475 825,081 Commission and brokerage 462,487 465,953 493,261 Other underwriting expenses 55,881 54,107 50,087 Underwriting gain (loss) $ 29,997 $ 483,620 $ 584,251 International Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 1,316,701 $ 1,230,683 $ 1,334,206 Net written premiums 1,229,597 1,082,712 1,208,978 Premiums earned $ 1,202,043 $ 1,119,121 $ 1,251,111 Incurred losses and LAE 1,059,640 486,550 749,891 Commission and brokerage 287,688 283,447 298,180 Other underwriting expenses 38,844 35,512 34,303 Underwriting gain (loss) $ (184,129 ) $ 313,612 $ 168,737 Bermuda Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 1,205,001 $ 890,375 $ 877,328 Net written premiums 1,139,082 831,931 791,594 Premiums earned $ 1,093,250 $ 837,964 $ 822,391 Incurred losses and LAE 735,292 461,909 456,448 Commission and brokerage 303,707 233,989 215,992 Other underwriting expenses 38,011 36,331 36,017 Underwriting gain (loss) $ 16,240 $ 105,735 $ 113,934 Insurance Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 2,059,248 $ 1,787,024 $ 1,532,287 Net written premiums 1,630,560 1,385,687 1,325,886 Premiums earned $ 1,461,387 $ 1,291,226 $ 1,266,660 Incurred losses and LAE 1,094,854 1,122,695 1,033,295 Commission and brokerage 250,081 205,303 176,213 Other underwriting expenses 186,081 176,772 136,661 Underwriting gain (loss) $ (69,629 ) $ (213,544 ) $ (79,509 ) F-64 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) 2017 2016 2015 Underwriting gain (loss) $ (207,521 ) $ 689,423 $ 787,412 Net investment income 542,898 473,085 473,473 Net realized capital gains (losses) 153,194 (7,216 ) (184,147 ) Net derivative gain (loss) 9,581 18,647 6,317 Corporate expenses (25,923 ) (27,231 ) (23,254 ) Interest, fee and bond issue cost amortization expense (31,603 ) (36,228 ) (36,191 ) Other income (expense) (35,442 ) (10,636 ) 88,280 Income (loss) before taxes $ 405,184 $ 1,099,844 $ 1,111,890 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: Years Ended December 31, (Dollars in thousands) 2017 2016 2015 United Kingdom $ 730,826 $ 688,598 $ 740,763 Approximately 20.4 19.4 20.7

Dispositions

Dispositions	12 Months Ended
	Dec. 31, 2017
Dispositions [Abstract]
Dispositions	18. DISPOSITIONS On August 24, 2016, the Company sold Heartland, its crop Managing General Agent to CGB for $ 49,000 12,942 On July 13, 2015, the Company closed its agreement to sell all of the outstanding shares of capital stock of Mt. McKinley, a Delaware domiciled insurance company and wholly-owned subsidiary of the Company to Clearwater Insurance Company, a Delaware domiciled insurance company. The Company received $ 20,156 Concurrently with the closing, the Company entered into a retrocession treaty with an affiliate of Clearwater Insurance Company. Per the retrocession treaty, the Company retroceded 100 140,279 100,451 440,279 300,000

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	19. SUBSEQUENT EVENTS The Company has evaluated known recognized and non-recognized subsequent events. The Company does not have any subsequent events to report.

Unaudited Quarterly Financial D

Unaudited Quarterly Financial Data	12 Months Ended
	Dec. 31, 2017
Unaudited Quarterly Financial Data [Abstract]
Unaudited Quarterly Financial Data	20. UNAUDITED QUARTERLY FINANCIAL DATA Summarized quarterly financial data for the periods indicated: 2017 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,600,944 $ 1,601,649 $ 2,044,902 $ 1,926,427 Net written premiums 1,413,814 1,339,133 1,798,089 1,693,625 Premiums earned 1,312,097 1,369,681 1,598,875 1,657,187 Net investment income 122,289 134,508 136,973 149,128 Net realized capital gains (losses) 52,728 25,268 41,535 33,663 Total claims and underwriting expenses 1,128,944 1,240,100 2,616,340 1,159,977 Net income (loss) 291,643 245,674 (639,374 ) 571,025 Earnings per common share attributable to Everest Re Group: Basic $ 7.12 $ 5.98 $ (15.73 ) $ 13.92 Diluted $ 7.07 $ 5.95 $ (15.73 ) $ 13.85 2016 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,353,189 $ 1,363,351 $ 1,782,616 $ 1,534,719 Net written premiums 1,181,457 1,154,953 1,564,644 1,369,851 Premiums earned 1,218,867 1,288,860 1,371,474 1,441,265 Net investment income 102,524 132,737 122,657 115,167 Net realized capital gains (losses) (74,259 ) 32,658 380 34,005 Total claims and underwriting expenses 1,047,865 1,225,395 1,174,276 1,183,507 Net income (loss) 171,686 155,692 295,394 373,572 Earnings per common share attributable to Everest Re Group: Basic $ 4.03 $ 3.70 $ 7.11 $ 9.14 Diluted $ 4.00 $ 3.67 $ 7.06 $ 9.08

Schedule I - Summary Of Investm

Schedule I - Summary Of Investments - Other Than Investments In Related Parties	12 Months Ended
	Dec. 31, 2017
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, 2017 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 $ 1,540,952 $ 1,536,692 $ 1,536,692 State, municipalities and political subdivisions 563,790 585,469 585,469 Foreign government securities 1,305,070 1,314,027 1,314,027 Foreign corporate securities 2,616,205 2,644,844 2,644,844 Public utilities 313,001 315,344 315,344 All other corporate bonds 5,875,896 5,912,998 5,912,998 Mortgage - backed securities: Commercial 235,794 234,041 234,041 Agency residential 2,236,361 2,210,902 2,210,902 Non-agency residential 497 494 494 Redeemable preferred stock 2,032 2,023 2,023 Total fixed maturities-available for sale 14,689,598 14,756,834 14,756,834 Equity securities - available for sale at market value 130,287 129,530 129,530 Equity securities - available for sale at fair value (1) 682,701 963,572 963,572 Short-term investments 509,682 509,682 509,682 Other invested assets 1,628,753 1,631,850 1,631,850 Cash 635,067 635,067 635,067 Total investments and cash $ 18,276,088 $ 18,626,535 $ 18,626,535 ( 1 ) Original cost does not reflect fair va lue 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, 2017
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) 2017 2016 ASSETS: Fixed maturities - available for sale, at market value $ 100,697 $ 2,178 (amortized cost: 2017, $100,703; 2016, $2,176) Other invested assets (cost: 2017, $102,559; 2016, $145,036) 102,559 145,036 Cash 3,275 2,034 Investment in subsidiaries, at equity in the underlying net assets 8,356,791 8,120,595 Accrued investment income 394 20 Receivable from subsidiaries 7,361 894 Other assets 49,829 60,603 TOTAL ASSETS $ 8,620,906 $ 8,331,360 LIABILITIES: Long term note payable - Affiliated $ 250,000 $ 250,000 Due to subsidiaries 1,017 1,020 Other liabilities 657 4,944 Total liabilities 251,674 255,964 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; (2017) 69,044 and (2016) 68,871 issued outstanding before treasury shares 691 689 Additional paid-in capital 2,165,768 2,140,783 Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $9,356 at 2017 and $8,240 at 2016 (160,891 ) (216,764 ) Treasury shares, at cost; 28,208 shares (2017) and 27,972 shares (2016) (3,322,244 ) (3,272,244 ) Retained earnings 9,685,908 9,422,932 Total shareholders' equity 8,369,232 8,075,396 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 8,620,906 $ 8,331,360 See notes to consolidated financial statements. SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT CONDENSED STATEMENTS OF OPERATIONS Years Ended December 31, 2017 2016 2015 (Dollars in thousands) REVENUES: Net investment income $ 1,344 $ 879 $ 3,895 Net realized capital gains (losses) 80 144 (3,057 ) Other income (expense) (6,873 ) 5,022 7,809 Net income (loss) of subsidiaries 495,496 1,012,315 989,462 Total revenues 490,048 1,018,360 998,109 EXPENSES: Interest expense - affiliated 4,300 4,300 4,300 Other expenses 16,780 17,716 15,940 Total expenses 21,080 22,016 20,240 INCOME (LOSS) BEFORE TAXES 468,968 996,344 977,869 Income tax expense (benefit) - - - NET INCOME (LOSS) $ 468,968 $ 996,344 $ 977,869 Other comprehensive income (loss), net of tax: Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period (64,348 ) 57,629 (274,127 ) Reclassification adjustment for realized losses (gains) included in net income (loss) (6,950 ) 15,118 93,688 Total URA(D) on securities arising during the period (71,298 ) 72,747 (180,439 ) Foreign currency translation adjustments 121,917 (55,341 ) (111,530 ) Benefit plan actuarial net gain (loss) for the period 1,027 (7,488 ) 5,681 Reclassification adjustment for amortization of net (gain) loss included in net income (loss) 5,477 5,073 6,216 Total benefit plan net gain (loss) for the period 6,504 (2,415 ) 11,897 Total other comprehensive income (loss), net of tax 57,123 14,991 (280,072 ) COMPREHENSIVE INCOME (LOSS) $ 526,091 $ 1,011,335 $ 697,797 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) 2017 2016 2015 CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 468,968 $ 996,344 $ 977,869 Adjustments to reconcile net income to net cash provided by operating activities: Equity in retained (earnings) deficit of subsidiaries (495,496 ) (1,012,315 ) (989,462 ) Dividends received from Bermuda Re 400,000 650,000 575,000 Dividends received from Everest International - 40,000 15,000 Dividends received from Mt. Logan Re 25,000 - - Change in other assets and liabilities, net 6,107 66 (7,626 ) Increase (decrease) in due to/from affiliates (6,470 ) (206 ) 839 Amortization of bond premium (accrual of bond discount) 12 (56 ) 525 Realized capital losses (gains) (80 ) (144 ) 3,057 Non-cash compensation expense 3,448 2,311 1,841 Net cash provided by (used in) operating activities 401,489 676,000 577,043 CASH FLOWS FROM INVESTING ACTIVITIES: Additional investment in subsidiaries (109,815 ) (77,324 ) (60,600 ) Proceeds from fixed maturities matured/called - available for sale, at market value 696 1,152 26,074 Proceeds from fixed maturities sold - available for sale, at market value 90,154 75,025 252,047 Distribution from other invested assets 546,414 757,399 - Cost of fixed maturities acquired - available for sale, at market value (189,308 ) - (532,480 ) Cost of other invested assets acquired (503,937 ) (902,435 ) - Net change in short-term investments - 18,288 279,462 Net cash provided by (used in) investing activities (165,796 ) (127,895 ) (35,497 ) CASH FLOWS FROM FINANCING ACTIVITIES: Common shares issued during the period, net 22,790 34,861 32,962 Purchase of treasury shares (50,000 ) (386,288 ) (400,059 ) Dividends paid to shareholders (207,242 ) (195,384 ) (175,107 ) Net cash provided by (used in) financing activities (234,452 ) (546,811 ) (542,204 ) EFFECT OF EXCHANGE RATE CHANGES ON CASH - - - Net increase (decrease) in cash 1,241 1,294 (658 ) Cash, beginning of period 2,034 740 1,398 Cash, end of period $ 3,275 $ 2,034 $ 740 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 $ 250,000 December 31, 2023 1.72 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 $ 50,373 58,955 6,352 5,536 8,268

Schedule III - Supplementary In

Schedule III - Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2017
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 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 December 31, 2016 Domestic $ 220,864 $ 6,604,867 $ 1,110,528 $ 3,363,381 $ 234,123 $ 2,191,170 $ 671,256 $ 230,879 $ 3,356,262 International 52,014 1,748,380 237,120 1,119,121 33,059 486,550 283,447 35,512 1,082,712 Bermuda 71,174 1,959,065 229,898 837,964 205,902 461,909 233,989 36,331 831,931 Total $ 344,052 $ 10,312,313 $ 1,577,546 $ 5,320,466 $ 473,085 $ 3,139,629 $ 1,188,692 $ 302,722 $ 5,270,905 December 31, 2015 Domestic $ 234,061 $ 6,114,129 $ 1,083,493 $ 3,219,340 $ 245,159 $ 1,858,376 $ 669,474 $ 186,748 $ 3,181,739 International 61,217 1,819,700 273,677 1,251,111 34,181 749,891 298,180 34,303 1,208,978 Bermuda 77,074 2,017,970 256,220 822,391 194,133 456,448 215,992 36,017 791,594 Total $ 372,351 $ 9,951,798 $ 1,613,390 $ 5,292,842 $ 473,473 $ 3,064,715 $ 1,183,646 $ 257,069 $ 5,182,311 (Some amounts may not reconcile due to rounding.)

Schedule IV - Reinsurance

Schedule IV - Reinsurance	12 Months Ended
	Dec. 31, 2017
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, 2017 Total property and liability insurance premiums earned $ 1,825,705 $ 833,387 $ 4,945,522 $ 5,937,840 83.3 % December 31, 2016 Total property and liability insurance premiums earned $ 1,694,702 $ 736,180 $ 4,361,944 $ 5,320,466 82.0 % December 31, 2015 Total property and liability insurance premiums earned $ 1,491,163 $ 698,847 $ 4,500,526 $ 5,292,842 85.0 %

Summary Of Significant Accoun32

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2017
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. During the fourth quarter of 2017, the Company established a new Irish insurance subsidiary, Everest Insurance Ireland, designated activity company ("Ireland Insurance"), which will write insurance business mainly in the European markets. During the third quarter of 2016, the Company established domestic subsidiaries, Everest Premier Insurance Company ("Everest Premier") and Everest Denali Insurance Company ("Everest Denali"), which are used in the continued expansion of the Insurance operations. Effective August 24, 2016, the Company sold its wholly-owned subsidiary, Heartland Crop Insurance Company ("Heartland"), a managing agent for crop insurance, to CGB Diversified Services, Inc. ("CGB"). The operating results of Heartland through August 24, 2016, are included within the Company's financial statements. Effective July 1, 2016, the Company established a new Irish holding company, Everest Dublin Insurance Holdings Limited (Ireland) ("Everest Dublin Holdings"). During the fourth quarter of 2015, the Company established new subsidiaries, Everest Preferred International Holdings, Ltd. ("Preferred International"), a Bermuda based company and Everest International Holdings (Bermuda), Ltd. ("International Holdings"), a Bermuda based company. These new subsidiaries were part of a capital restructuring within the Company to support a planned increase in international business production, which includes directly supporting Group's Lloyd's of London Syndicate corporate member. Effective July 13, 2015, the Company sold all of the outstanding shares of capital stock of a wholly-owned subsidiary entity, Mt. McKinley Insurance Company ("Mt. McKinley"), to Clearwater Insurance Company. The operating results of Mt. McKinley through July 13, 2015 are included within the Company's financial statements. Effective February 27, 2013, the Company established a new subsidiary, Mt. Logan Reinsurance Limited ("Mt. Logan Re"). Mt. Logan Re manages separate segregated accounts whose assets and capital relate mainly to third party external investors. The segregated account activities related to third party external investors are not included as part of the Company's financial statements. 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., International Holdings, Everest Corporate Member Limited, Everest Service Company (UK), 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 Holdings, Ireland Insurance, Everest Reinsurance Company (Ireland), designated activity company ("Ireland Re"), Everest Reinsurance Holdings, Inc. ("Holdings"), Heartland, 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., Workcare Southeast of Georgia, Inc., 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, 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 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" 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 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 2017 presentation.
Investments	B. Investments. Fixed maturity and equity security 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. The Company carries all of its equity securities at fair value except for mutual fund investments whose underlying investments are comprised of fixed maturity securities. For equity securities, available for sale, 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, an investment manager's valuation committee 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, a private placement liquidity sweep facility and rabbi trusts. Cash contributions to and cash distributions from the sweep facility are 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) 2017 2016 Reinsurance receivables and premium receivables $ 23,473 $ 23,360
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) 2017 2016 2015 Deferred acquisition costs $ 1,303,963 $ 1,188,692 $ 1,183,646
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. Payout annuity premiums are recognized as revenue over the premium-paying period of the policies.
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
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) 2017 2016 2015 Net income (loss) per share: Numerator Net income (loss) $ 468,968 $ 996,344 $ 977,869 Less: dividends declared-common shares and nonvested common shares (207,242 ) (195,384 ) (175,107 ) Undistributed earnings 261,725 800,960 802,762 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 258,952 792,415 794,309 Add: dividends declared-common shareholders 205,182 193,413 173,367 Numerator for basic and diluted earnings per common share $ 464,134 $ 985,829 $ 967,676 Denominator Denominator for basic earnings per weighted-average common shares 40,595 41,329 43,415 Effect of dilutive securities: Options 248 300 380 Denominator for diluted earnings per adjusted weighted-average common shares 40,843 41,628 43,795 Per common share net income (loss) Basic $ 11.43 $ 23.85 $ 22.29 Diluted $ 11.36 $ 23.68 $ 22.10 (1) Basic weighted-average common shares outstanding 40,595 41,329 43,415 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 41,030 41,774 43,877 Percentage allocated to common shareholders 98.9 % 98.9 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no All outstanding options expire on or between February 20, 2018 September 19, 2022
Segmentation	L. Segmentation. The Company, through its subsidiaries, operates in four
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). One of these contracts expired on June 9, 2017, with no liability due under the terms of the contract. F-12 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 2017 2016 Equity index put option contracts Equity index put option liability $ 12,477 $ 22,059 Total $ 12,477 $ 22,059 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) Derivatives not designated as Location of gain (loss) in statements of For the Years Ended December 31, hedging instruments operations and comprehensive income (loss) 2017 2016 2015 Equity index put option contracts Net derivative gain (loss) $ 9,581 $ 18,647 $ 6,317 Total $ 9,581 $ 18,647 $ 6,317
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 Deferred Taxes in Accumulated Other Comprehensive Income (AOCI). 35 21 1,250 Accounting for Impact on Income Taxes due to Tax Reform. Amortization of Bond Premium. Presentation and Disclosure of Net Periodic Benefit Costs. Disclosure of Restricted Cash. Intra-Entity Asset Transfers. Valuation of Financial Instruments. Accounting for Share-Based Compensation. The following table presents certain financial statement line items as previously reported in 2016 and 2015, the effect of those line items due to treating the cost of shares withheld upon settlement of share-based compensation awards as a financing activity with the Statements of Cash Flows and the line items as currently reported within the financial statements. Years Ended December 31, Consolidated Statements of Cash Flows: 2016 2015 Effect of Effect of adoption of adoption of As previously new accounting As previously new accounting reported policy As adopted reported policy As adopted (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Change in other assets and liabilities, net $ (56,204 ) $ 10,595 $ (45,609 ) $ (8,934 ) $ 11,601 $ 2,667 Net cash provided by (used in) operating activities 1,373,005 10,595 1,383,600 1,096,634 11,601 1,108,235 CASH FLOWS FROM FINANCING ACTIVITIES: Cost of shares withheld for taxes on settlements of share-based compensation awards - (10,595 ) (10,595 ) - (11,601 ) (11,601 ) Net cash provided by (used in) financing activities (570,921 ) (10,595 ) (581,516 ) (561,569 ) (11,601 ) (573,170 ) Leases. Recognition and Measurement of Financial Instruments. Disclosures about Short-Duration Contracts. Disclosures for Investments in Certain Entities that Calculate Net Asset Value Per Share. Debt Issuance Costs. Consolidation. The following tables present certain financial statement line items as previously reported in 2015, the effect on those line items due to not consolidating the segregated accounts of Mt. Logan Re, in accordance with the newly adopted accounting policy and the line items as currently reported within the financial statements. CONSOLIDATED BALANCE SHEET: December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted ASSETS: Short-term investments $ 1,795,455 $ (995,771 ) $ 799,684 Total investments and cash 17,672,176 (995,771 ) 16,676,405 Premiums receivable 1,479,293 3,797 1,483,090 Reinsurance receivables 840,420 53,617 894,037 Deferred acquisition costs 373,072 (721 ) 372,351 Prepaid reinsurance premiums 157,424 7,547 164,971 Other assets 265,634 56,184 321,818 TOTAL ASSETS 21,426,175 (875,347 ) 20,550,828 LIABILITIES: Funds held under reinsurance treaties 88,544 (75,000 ) 13,544 Commission reserves 79,849 (19,751 ) 60,098 Other net payable to reinsurers 166,822 6,265 173,087 Other liabilities 291,322 (30,000 ) 261,322 Total liabilities 13,060,729 (118,486 ) 12,942,243 NONCONTROLLING INTERESTS: Redeemable noncontrolling interests - Mt. Logan Re 756,861 (756,861 ) - TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY 21,426,175 (875,347 ) 20,550,828 CONSOLIDATED STATEMENTS OF OPERATIONS Twelve Months Ended December 31, 2015 AND COMPREHENSIVE INCOME (LOSS): Effect of adoption of As previously new accounting reported policy As adopted (Dollars in thousands) REVENUES: Premiums earned $ 5,481,459 $ (188,617 ) $ 5,292,842 Net investment income 473,825 (352 ) 473,473 Other income (expense) 60,435 27,845 88,280 Total revenues 5,837,889 (161,124 ) 5,676,765 CLAIMS AND EXPENSES: Incurred losses and loss adjustment expenses 3,101,915 (37,200 ) 3,064,715 Commission, brokerage, taxes and fees 1,202,036 (18,390 ) 1,183,646 Other underwriting expenses 265,984 (8,915 ) 257,069 Total claims and expenses 4,629,380 (64,505 ) 4,564,875 INCOME (LOSS) BEFORE TAXES 1,208,509 (96,619 ) 1,111,890 NET INCOME (LOSS) 1,074,488 (96,619 ) 977,869 Net income (loss) attributable to noncontrolling interests (96,619 ) 96,619 - NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP 977,869 (977,869 ) - CONSOLIDATED STATEMENT OF CASH FLOWS: Twelve Months Ended December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 1,074,488 $ (96,619 ) $ 977,869 Decrease (increase) in premiums receivable (93,837 ) (4,374 ) (98,211 ) Decrease (increase) in funds held by reinsureds, net 31,225 (75,000 ) (43,775 ) Decrease (increase) in reinsurance receivables (240,414 ) (24,689 ) (265,103 ) Decrease (increase) in prepaid reinsurance premiums (14,486 ) (7,333 ) (21,819 ) Increase (decrease) in other net payable to reinsurers 38,262 5,465 43,727 Change in other assets and liabilities, net 264 (9,198 ) (8,934 ) Net cash provided by (used in) operating activities 1,308,382 (211,748 ) 1,096,634 CASH FLOWS FROM INVESTING ACTIVITIES: Net change in short-term investments (98,903 ) 440,636 341,733 Net cash provided by (used in) investing activities (1,121,737 ) 440,636 (681,101 ) CASH FLOWS FROM FINANCING ACTIVITIES: Third party investment in redeemable noncontrolling interest 266,848 (266,848 ) - Subscription advances for third party redeemable noncontrolling interest 30,000 (30,000 ) - Dividends paid on third party investment in redeemable noncontrolling interest (68,158 ) 68,158 - Net cash provided by (used in) financing activities (332,879 ) (228,690 ) (561,569 ) EFFECT OF EXCHANGE RATE CHANGES ON CASH (7,582 ) (198 ) (7,780 ) Revenue Recognition. Any issued guidance and pronouncements, other than those directly references above, are deemed by the Company to be either not applicable or immaterial to its financial statements.

Summary Of Significant Accoun33

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables	Years Ended December 31, (Dollars in thousands) 2017 2016 Reinsurance receivables and premium receivables $ 23,473 $ 23,360
Schedule Of Deferred Acquisition Costs Amortized To Income	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Deferred acquisition costs $ 1,303,963 $ 1,188,692 $ 1,183,646
Net Income (Loss) Per Common Share	Years Ended December 31, (Dollars in thousands, except per share amounts) 2017 2016 2015 Net income (loss) per share: Numerator Net income (loss) $ 468,968 $ 996,344 $ 977,869 Less: dividends declared-common shares and nonvested common shares (207,242 ) (195,384 ) (175,107 ) Undistributed earnings 261,725 800,960 802,762 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 258,952 792,415 794,309 Add: dividends declared-common shareholders 205,182 193,413 173,367 Numerator for basic and diluted earnings per common share $ 464,134 $ 985,829 $ 967,676 Denominator Denominator for basic earnings per weighted-average common shares 40,595 41,329 43,415 Effect of dilutive securities: Options 248 300 380 Denominator for diluted earnings per adjusted weighted-average common shares 40,843 41,628 43,795 Per common share net income (loss) Basic $ 11.43 $ 23.85 $ 22.29 Diluted $ 11.36 $ 23.68 $ 22.10 (1) Basic weighted-average common shares outstanding 40,595 41,329 43,415 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 41,030 41,774 43,877 Percentage allocated to common shareholders 98.9 % 98.9 % 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 2017 2016 Equity index put option contracts Equity index put option liability $ 12,477 $ 22,059 Total $ 12,477 $ 22,059
Change In Fair Value Of The Equity Index Put Option Contracts	(Dollars in thousands) Derivatives not designated as Location of gain (loss) in statements of For the Years Ended December 31, hedging instruments operations and comprehensive income (loss) 2017 2016 2015 Equity index put option contracts Net derivative gain (loss) $ 9,581 $ 18,647 $ 6,317 Total $ 9,581 $ 18,647 $ 6,317
Schedule of Effect of Newly Adopted Accounting Policies, Balance Sheet	CONSOLIDATED BALANCE SHEET: December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted ASSETS: Short-term investments $ 1,795,455 $ (995,771 ) $ 799,684 Total investments and cash 17,672,176 (995,771 ) 16,676,405 Premiums receivable 1,479,293 3,797 1,483,090 Reinsurance receivables 840,420 53,617 894,037 Deferred acquisition costs 373,072 (721 ) 372,351 Prepaid reinsurance premiums 157,424 7,547 164,971 Other assets 265,634 56,184 321,818 TOTAL ASSETS 21,426,175 (875,347 ) 20,550,828 LIABILITIES: Funds held under reinsurance treaties 88,544 (75,000 ) 13,544 Commission reserves 79,849 (19,751 ) 60,098 Other net payable to reinsurers 166,822 6,265 173,087 Other liabilities 291,322 (30,000 ) 261,322 Total liabilities 13,060,729 (118,486 ) 12,942,243 NONCONTROLLING INTERESTS: Redeemable noncontrolling interests - Mt. Logan Re 756,861 (756,861 ) - TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY 21,426,175 (875,347 ) 20,550,828
Schedule of Effect of Newly Adopted Accounting Policies, Operations and Comprehensive Income	CONSOLIDATED STATEMENTS OF OPERATIONS Twelve Months Ended December 31, 2015 AND COMPREHENSIVE INCOME (LOSS): Effect of adoption of As previously new accounting reported policy As adopted (Dollars in thousands) REVENUES: Premiums earned $ 5,481,459 $ (188,617 ) $ 5,292,842 Net investment income 473,825 (352 ) 473,473 Other income (expense) 60,435 27,845 88,280 Total revenues 5,837,889 (161,124 ) 5,676,765 CLAIMS AND EXPENSES: Incurred losses and loss adjustment expenses 3,101,915 (37,200 ) 3,064,715 Commission, brokerage, taxes and fees 1,202,036 (18,390 ) 1,183,646 Other underwriting expenses 265,984 (8,915 ) 257,069 Total claims and expenses 4,629,380 (64,505 ) 4,564,875 INCOME (LOSS) BEFORE TAXES 1,208,509 (96,619 ) 1,111,890 NET INCOME (LOSS) 1,074,488 (96,619 ) 977,869 Net income (loss) attributable to noncontrolling interests (96,619 ) 96,619 - NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP 977,869 (977,869 ) -
Accounting Standards Update 2016-02 [Member]
Schedule of Effect of Newly Adopted Accounting Policies, Cash Flow	Years Ended December 31, Consolidated Statements of Cash Flows: 2016 2015 Effect of Effect of adoption of adoption of As previously new accounting As previously new accounting reported policy As adopted reported policy As adopted (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Change in other assets and liabilities, net $ (56,204 ) $ 10,595 $ (45,609 ) $ (8,934 ) $ 11,601 $ 2,667 Net cash provided by (used in) operating activities 1,373,005 10,595 1,383,600 1,096,634 11,601 1,108,235 CASH FLOWS FROM FINANCING ACTIVITIES: Cost of shares withheld for taxes on settlements of share-based compensation awards - (10,595 ) (10,595 ) - (11,601 ) (11,601 ) Net cash provided by (used in) financing activities (570,921 ) (10,595 ) (581,516 ) (561,569 ) (11,601 ) (573,170 )
Accounting Standards Update 2015-02 [Member]
Schedule of Effect of Newly Adopted Accounting Policies, Cash Flow	CONSOLIDATED STATEMENT OF CASH FLOWS: Twelve Months Ended December 31, 2015 Effect of adoption of As previously new accounting (Dollars in thousands) reported policy As adopted CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 1,074,488 $ (96,619 ) $ 977,869 Decrease (increase) in premiums receivable (93,837 ) (4,374 ) (98,211 ) Decrease (increase) in funds held by reinsureds, net 31,225 (75,000 ) (43,775 ) Decrease (increase) in reinsurance receivables (240,414 ) (24,689 ) (265,103 ) Decrease (increase) in prepaid reinsurance premiums (14,486 ) (7,333 ) (21,819 ) Increase (decrease) in other net payable to reinsurers 38,262 5,465 43,727 Change in other assets and liabilities, net 264 (9,198 ) (8,934 ) Net cash provided by (used in) operating activities 1,308,382 (211,748 ) 1,096,634 CASH FLOWS FROM INVESTING ACTIVITIES: Net change in short-term investments (98,903 ) 440,636 341,733 Net cash provided by (used in) investing activities (1,121,737 ) 440,636 (681,101 ) CASH FLOWS FROM FINANCING ACTIVITIES: Third party investment in redeemable noncontrolling interest 266,848 (266,848 ) - Subscription advances for third party redeemable noncontrolling interest 30,000 (30,000 ) - Dividends paid on third party investment in redeemable noncontrolling interest (68,158 ) 68,158 - Net cash provided by (used in) financing activities (332,879 ) (228,690 ) (561,569 ) EFFECT OF EXCHANGE RATE CHANGES ON CASH (7,582 ) (198 ) (7,780 )

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At December 31, 2017 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 $ 1,540,952 $ 9,816 $ (14,076 ) $ 1,536,692 $ - Obligations of U.S. states and political subdivisions 563,790 22,123 (444 ) 585,469 - Corporate securities 5,658,456 81,724 (41,175 ) 5,699,005 2,488 Asset-backed securities 532,473 869 (1,982 ) 531,360 - Mortgage-backed securities Commercial 235,794 616 (2,369 ) 234,041 - Agency residential 2,236,361 10,379 (35,838 ) 2,210,902 - Non-agency residential 497 41 (44 ) 494 - Foreign government securities 1,305,070 43,804 (34,847 ) 1,314,027 178 Foreign corporate securities 2,616,205 77,045 (48,406 ) 2,644,844 950 Total fixed maturity securities $ 14,689,598 $ 246,417 $ (179,181 ) $ 14,756,834 $ 3,616 Equity securities $ 130,287 $ 2,615 $ (3,372 ) $ 129,530 $ - At December 31, 2016 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 $ 1,115,208 $ 20,410 $ (5,303 ) $ 1,130,315 $ - Obligations of U.S. states and political subdivisions 723,938 18,016 (11,970 ) 729,984 - Corporate securities 5,059,388 131,651 (35,758 ) 5,155,281 7,936 Asset-backed securities 488,824 1,110 (1,286 ) 488,648 - Mortgage-backed securities Commercial 308,827 1,983 (3,878 ) 306,932 - Agency residential 2,415,901 17,478 (27,910 ) 2,405,469 - Non-agency residential 642 44 (45 ) 641 - Foreign government securities 1,254,175 61,226 (57,241 ) 1,258,160 115 Foreign corporate securities 2,565,710 130,714 (64,446 ) 2,631,978 1,184 Total fixed maturity securities $ 13,932,613 $ 382,632 $ (207,837 ) $ 14,107,408 $ 9,235 Equity securities $ 129,553 $ 2,298 $ (12,784 ) $ 119,067 $ - (a)
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At December 31, 2017 At December 31, 2016 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,041,885 $ 1,050,094 $ 956,945 $ 966,970 Due after one year through five years 7,545,731 7,554,248 6,769,585 6,870,056 Due after five years through ten years 2,214,473 2,231,456 2,020,215 2,052,733 Due after ten years 882,384 944,239 971,674 1,015,959 Asset-backed securities 532,473 531,360 488,824 488,648 Mortgage-backed securities: Commercial 235,794 234,041 308,827 306,932 Agency residential 2,236,361 2,210,902 2,415,901 2,405,469 Non-agency residential 497 494 642 641 Total fixed maturity securities $ 14,689,598 $ 14,756,834 $ 13,932,613 $ 14,107,408
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Years Ended December 31, (Dollars in thousands) 2017 2016 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ (101,940 ) $ 85,972 Fixed maturity securities, other-than-temporary impairment (5,618 ) 7,734 Equity securities 9,730 2,845 Other invested assets 3,037 60 Change in unrealized appreciation (depreciation), pre-tax (94,791 ) 96,611 Deferred tax benefit (expense) 21,905 (22,075 ) Deferred tax benefit (expense), other-than-temporary impairment (1,588 ) (1,789 ) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ (71,298 ) $ 72,747
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, 2017 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 $ 1,077,051 $ (8,380 ) $ 224,189 $ (5,696 ) $ 1,301,240 $ (14,076 ) Obligations of U.S. states and political subdivisions 4,400 (27 ) 37,886 (417 ) 42,286 (444 ) Corporate securities 1,779,292 (24,942 ) 700,098 (16,233 ) 2,479,390 (41,175 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities Commercial 101,821 (572 ) 64,272 (1,797 ) 166,093 (2,369 ) Agency residential 610,941 (4,836 ) 1,343,547 (31,002 ) 1,954,488 (35,838 ) Non-agency residential - - 69 (44 ) 69 (44 ) Foreign government securities 327,790 (12,811 ) 331,432 (22,036 ) 659,222 (34,847 ) Foreign corporate securities 691,865 (19,381 ) 450,860 (29,025 ) 1,142,725 (48,406 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) Equity securities - - 113,506 (3,372 ) 113,506 (3,372 ) Total $ 4,894,476 $ (72,416 ) $ 3,338,639 $ (110,137 ) $ 8,233,115 $ (182,553 ) Duration of Unrealized Loss at December 31, 2016 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 $ 638,740 $ (5,303 ) $ - $ - $ 638,740 $ (5,303 ) Obligations of U.S. states and political subdivisions 221,088 (11,486 ) 564 (484 ) 221,652 (11,970 ) Corporate securities 1,360,743 (24,023 ) 177,153 (11,735 ) 1,537,896 (35,758 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities Commercial 143,554 (3,223 ) 7,184 (655 ) 150,738 (3,878 ) Agency residential 1,618,372 (22,461 ) 189,665 (5,449 ) 1,808,037 (27,910 ) Non-agency residential - - 113 (45 ) 113 (45 ) Foreign government securities 360,289 (12,041 ) 236,820 (45,200 ) 597,109 (57,241 ) Foreign corporate securities 687,599 (12,769 ) 295,500 (51,677 ) 983,099 (64,446 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) Equity securities - - 105,507 (12,784 ) 105,507 (12,784 ) Total $ 5,180,408 $ (91,871 ) $ 1,031,292 $ (128,750 ) $ 6,211,700 $ (220,621 )
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, 2017 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 $ 247,927 $ (962 ) $ 206,113 $ (7,643 ) $ 454,040 $ (8,605 ) Due in one year through five years 2,930,977 (42,480 ) 1,200,414 (52,143 ) 4,131,391 (94,623 ) Due in five years through ten years 612,702 (20,154 ) 292,245 (12,680 ) 904,947 (32,834 ) Due after ten years 88,792 (1,945 ) 45,693 (941 ) 134,485 (2,886 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities 712,762 (5,408 ) 1,407,888 (32,843 ) 2,120,650 (38,251 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) Duration of Unrealized Loss at December 31, 2016 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 $ 178,281 $ (1,122 ) $ 78,153 $ (14,318 ) $ 256,434 $ (15,440 ) Due in one year through five years 2,123,113 (26,263 ) 538,130 (84,803 ) 2,661,243 (111,066 ) Due in five years through ten years 680,334 (22,555 ) 86,631 (8,754 ) 766,965 (31,309 ) Due after ten years 286,731 (15,682 ) 7,123 (1,221 ) 293,854 (16,903 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities 1,761,926 (25,684 ) 196,962 (6,149 ) 1,958,888 (31,833 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 )
Summary Of Components Of Net Investment Income	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Fixed maturities $ 427,379 $ 410,337 $ 433,097 Equity securities 34,523 40,707 45,617 Short-term investments and cash 4,177 1,769 1,225 Other invested assets Limited partnerships 83,569 38,647 14,431 Other 10,125 2,852 1,804 Gross investment income before adjustments 559,773 494,312 496,174 Funds held interest income (expense) 11,874 7,853 10,767 Future policy benefit reserve income (expense) (1,282 ) (1,633 ) (1,907 ) Gross investment income 570,365 500,532 505,034 Investment expenses (27,467 ) (27,447 ) (31,561 ) Net investment income $ 542,898 $ 473,085 $ 473,473
Summary Of Components Of Net Realized Capital Gains (Losses)	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Fixed maturity securities, market value: Other-than-temporary impairments $ (7,093 ) $ (31,595 ) $ (102,199 ) Gains (losses) from sales 17,714 6,918 (22,310 ) Fixed maturity securities, fair value: Gains (losses) from sales - (1,586 ) 24 Gains (losses) from fair value adjustments - 1,381 (44 ) Equity securities, market value: Gains (losses) from sales (3,424 ) 1,426 (6,702 ) Equity securities, fair value: Gains (losses) from sales 6,969 (13,442 ) (7,305 ) Gains (losses) from fair value adjustments 138,973 57,686 (45,627 ) Sale of Subsidiary - (28,032 ) - Other invested assets 61 18 - Short-term investments gain (loss) (6 ) 10 16 Total net realized capital gains (losses) $ 153,194 $ (7,216 ) $ (184,147 )
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Proceeds from sales of fixed maturity securities $ 2,401,844 $ 1,264,271 $ 1,725,917 Gross gains from sales 58,589 53,093 47,899 Gross losses from sales (40,875 ) (47,761 ) (70,185 ) Proceeds from sales of equity securities $ 651,433 $ 729,782 $ 642,980 Gross gains from sales 24,809 18,462 27,675 Gross losses from sales (21,264 ) (30,478 ) (41,682 )

Reserve For Losses, LAE And F35

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	12 Months Ended
	Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	At December 31, (Dollars in thousands) 2017 2016 2015 Gross reserves at January 1 $ 10,312,313 $ 9,951,798 $ 9,720,813 Less reinsurance recoverables (990,862 ) (881,503 ) (655,095 ) Net reserves at January 1 9,321,451 9,070,295 9,065,718 Incurred related to: Current year 4,815,967 3,434,964 3,129,744 Prior years (293,386 ) (295,335 ) (65,029 ) Total incurred losses and LAE 4,522,581 3,139,629 3,064,715 Paid related to: Current year 1,280,605 745,642 690,030 Prior years 2,062,634 2,042,972 2,180,076 Total paid losses and LAE 3,343,239 2,788,614 2,870,106 Foreign exchange/translation adjustment 170,879 (99,859 ) (190,032 ) Net reserves at December 31 10,671,672 9,321,451 9,070,295 Plus reinsurance recoverables 1,212,649 990,862 881,503 Gross reserves at December 31 $ 11,884,321 $ 10,312,313 $ 9,951,798
Ultimate Loss and ALAE And Paid Loss And ALAE, Net Of Reinsurance	U.S. Reinsurance - Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 401,208 $ 396,348 $ 329,918 $ 326,226 $ 322,346 $ 322,565 46,925 N/A 2013 311,205 388,852 386,448 389,284 373,749 93,170 N/A 2014 367,685 384,036 392,897 376,147 135,094 N/A 2015 326,444 354,411 346,598 163,674 N/A 2016 330,385 345,872 221,582 N/A 2017 337,220 272,301 N/A $ 2,102,152 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 10,106 $ 38,799 $ 83,546 $ 144,228 $ 188,127 $ 219,687 2013 14,966 49,254 109,285 171,491 212,063 2014 18,903 54,460 110,545 164,958 2015 19,959 53,707 107,130 2016 18,941 58,329 2017 25,807 $ 787,973 All outstanding liabilities prior to 2012, net of reinsurance 945,365 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,259,543 (Some amounts may not reconcile due to rounding.) U.S. Reinsurance - Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 938,601 $ 725,098 $ 623,648 $ 610,631 $ 610,276 $ 606,657 16,054 N/A 2013 622,938 549,240 496,089 457,205 450,155 3,744 N/A 2014 641,956 551,402 474,834 439,279 10,087 N/A 2015 679,721 544,879 489,437 43,074 N/A 2016 966,781 792,187 109,698 N/A 2017 1,586,271 546,690 N/A $ 4,363,986 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 242,627 $ 403,010 $ 494,159 $ 530,630 $ 548,146 $ 565,001 2013 234,991 323,776 382,559 406,717 421,086 2014 218,933 322,307 370,796 396,820 2015 226,696 328,079 389,975 2016 286,444 552,545 2017 573,713 $ 2,899,139 All outstanding liabilities prior to 2012, net of reinsurance 60,784 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,525,631 (Some amounts may not reconcile due to rounding.) International - Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 227,948 $ 150,293 $ 139,412 $ 139,717 $ 122,272 $ 124,525 15,504 N/A 2013 188,025 172,834 170,467 150,865 148,265 28,514 N/A 2014 199,941 192,814 174,864 173,512 48,051 N/A 2015 197,518 183,842 179,038 65,441 N/A 2016 187,347 185,209 99,564 N/A 2017 194,925 143,028 N/A $ 1,005,474 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 19,429 $ 31,226 $ 47,743 $ 58,671 $ 68,806 $ 80,760 2013 18,472 42,905 57,067 70,853 79,808 2014 26,813 46,921 65,505 77,474 2015 25,231 50,706 72,943 2016 27,391 53,345 2017 27,791 $ 392,120 All outstanding liabilities prior to 2012, net of reinsurance 145,624 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 758,977 (Some amounts may not reconcile due to rounding.) International - Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 573,735 $ 528,305 $ 476,043 $ 479,524 $ 479,764 $ 480,506 1,408 N/A 2013 505,569 456,098 419,238 411,751 411,244 1,572 N/A 2014 599,886 546,124 501,195 445,950 7,250 N/A 2015 572,741 442,366 442,460 21,359 N/A 2016 538,515 509,642 72,123 N/A 2017 909,349 322,168 N/A $ 3,199,151 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 206,138 $ 336,226 $ 406,317 $ 430,935 $ 444,579 $ 455,715 2013 139,602 279,575 334,994 366,226 380,369 2014 167,362 291,893 360,863 393,241 2015 149,495 270,540 341,937 2016 159,858 294,628 2017 280,649 $ 2,146,540 All outstanding liabilities prior to 2012, net of reinsurance 103,727 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,156,337 (Some amounts may not reconcile due to rounding.) Bermuda - Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 288,697 $ 266,090 $ 245,087 $ 234,742 $ 241,295 $ 242,044 49,365 N/A 2013 231,658 262,083 256,555 265,366 255,034 85,969 N/A 2014 214,950 247,916 265,623 261,968 125,790 N/A 2015 282,046 309,169 314,580 150,231 N/A 2016 300,633 358,834 210,524 N/A 2017 362,365 286,954 N/A $ 1,794,825 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 13,377 $ 30,638 $ 52,690 $ 77,461 $ 104,005 $ 132,402 2013 17,517 34,814 53,401 78,677 104,610 2014 13,929 25,538 43,779 69,033 2015 14,318 62,136 96,964 2016 48,492 87,950 2017 31,158 $ 522,117 All outstanding liabilities prior to 2012, net of reinsurance 478,609 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 1,751,317 (Some amounts may not reconcile due to rounding.) Bermuda - Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 242,489 $ 184,894 $ 169,173 $ 164,846 $ 165,056 $ 165,817 737 N/A 2013 211,458 153,464 136,667 127,106 126,436 399 N/A 2014 185,865 164,884 138,821 135,607 2,741 N/A 2015 196,374 162,783 149,996 12,333 N/A 2016 211,265 180,278 52,012 N/A 2017 405,011 254,550 N/A $ 1,163,145 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 46,925 $ 87,774 $ 119,980 $ 146,835 $ 153,521 $ 156,471 2013 32,790 71,070 112,539 119,844 121,912 2014 29,932 86,034 106,632 127,117 2015 34,305 75,459 114,061 2016 27,748 79,795 2017 40,462 $ 639,818 All outstanding liabilities prior to 2012, net of reinsurance 41,326 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 564,654 (Some amounts may not reconcile due to rounding.) Insurance - Casualty Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 349,831 $ 351,636 $ 347,165 $ 348,331 $ 353,459 $ 344,074 30,569 15,956 2013 393,819 393,629 393,066 393,209 351,451 43,549 20,755 2014 431,503 457,475 455,004 461,061 132,391 25,009 2015 520,192 528,841 536,494 207,887 26,472 2016 554,546 556,966 276,184 30,384 2017 618,939 474,699 26,419 $ 2,868,985 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 33,202 $ 101,311 $ 157,947 $ 213,520 $ 246,496 $ 272,165 2013 33,317 117,054 176,338 224,652 260,257 2014 41,197 124,955 201,725 256,954 2015 44,322 134,787 219,105 2016 54,747 164,415 2017 53,926 $ 1,226,821 All outstanding liabilities prior to 2012, net of reinsurance 492,565 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 2,134,728 (Some amounts may not reconcile due to rounding.) Insurance - Property Business At December 31, 2017 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 on Reported Number of Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) Claims Reported Claims (Dollars in thousands) 2012 $ 106,397 $ 89,072 $ 81,797 $ 82,500 $ 82,068 $ 81,851 52 N/A 2013 112,122 98,290 91,407 92,292 92,381 509 N/A 2014 131,817 123,811 120,044 119,576 1,064 N/A 2015 173,196 153,145 144,202 (1,388 ) N/A 2016 303,241 276,110 (612 ) N/A 2017 526,318 186,608 N/A $ 1,240,439 (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 Accident Year (unaudited) (unaudited) (unaudited) (unaudited) (unaudited) (Dollars in thousands) 2012 $ 56,508 $ 81,820 $ 80,519 $ 81,800 $ 81,940 $ 81,731 2013 68,726 93,241 91,989 92,259 91,868 2014 81,875 116,135 118,327 118,323 2015 102,300 141,494 142,670 2016 162,930 250,221 2017 206,938 $ 891,750 All outstanding liabilities prior to 2012, net of reinsurance 1,258 Liabilities for claims and claim adjustment expenses, net of reinsurance $ 349,948 (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 Casualty 5.2% 9.7% 15.1% 16.5% 12.1% 9.8% 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 Property 40.4% 27.1% 13.1% 5.8% 3.0% 2.8% International - Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Casualty 14.4% 13.3% 11.4% 8.2% 7.0% 9.6% International - Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Property 34.5% 28.4% 14.9% 6.6% 3.1% 2.3% Bermuda - Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Casualty 7.7% 9.3% 8.7% 9.9% 10.6% 11.7% Bermuda - Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Property 18.2% 30.1% 23.0% 12.8% 3.0% 1.8% Insurance - Casualty Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Casualty 9.1% 19.4% 16.4% 13.8% 9.9% 7.5% Insurance - Property Business Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (unaudited) Years 1 2 3 4 5 6 Property 63.5% 29.5% 0.2% 0.5% -0.1% -0.3%
Reconciliation of the Net Incurred and Paid Claims Development	December 31, 2017 (Dollars in thousands) Net outstanding liabilities U.S. Reinsurance Casualty $ 2,259,543 U.S. Reinsurance Property 1,525,631 International Casualty 758,977 International Property 1,156,337 Bermuda Casualty 1,751,317 Bermuda Property 564,654 Insurance Casualty 2,134,728 Insurance Property 349,948 Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 10,501,136 Reinsurance recoverable on unpaid claims U.S. Reinsurance Casualty 110,852 U.S. Reinsurance Property 192,205 International Casualty 92,937 International Property 116,737 Bermuda Casualty 2,975 Bermuda Property 144,242 Insurance Casualty 492,606 Insurance Property 60,095 Total reinsurance recoverable on unpaid claims 1,212,649 Insurance lines other than short-duration - Unallocated claims adjustment expenses 136,611 Other 33,925 170,536 Total gross liability for unpaid claims and claim adjustment expense $ 11,884,321 (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) 2017 2016 2015 Gross basis: Beginning of period reserves $ 441,111 $ 433,117 $ 476,205 Incurred losses 90,009 73,336 40,000 Paid losses (82,126 ) (65,342 ) (83,088 ) End of period reserves $ 448,994 $ 441,111 $ 433,117 Net basis: Beginning of period reserves $ 319,072 $ 319,620 $ 458,211 Incurred losses 37,137 53,909 38,440 Paid losses (38,128 ) (54,457 ) (177,031 ) End of period reserves $ 318,081 $ 319,072 $ 319,620
Summary Of Activity In The Reserve For Future Policy Benefits	At December 31, (Dollars in thousands) 2017 2016 2015 Balance at beginning of year $ 55,074 $ 58,910 $ 59,820 Liabilities assumed 115 175 315 Adjustments to reserves (437 ) 303 2,310 Benefits paid in the current year (3,738 ) (4,315 ) (3,535 ) Balance at end of year $ 51,014 $ 55,074 $ 58,910 (Some amounts may not reconcile due to rounding.)

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,536,692 $ - $ 1,536,692 $ - Obligations of U.S. States and political subdivisions 585,469 - 585,469 - Corporate securities 5,699,005 - 5,488,819 210,186 Asset-backed securities 531,360 - 531,360 - Mortgage-backed securities Commercial 234,041 - 234,041 - Agency residential 2,210,902 - 2,210,902 - Non-agency residential 494 - 494 - Foreign government securities 1,314,027 - 1,314,027 - Foreign corporate securities 2,644,844 - 2,637,892 6,952 Total fixed maturities, market value 14,756,834 - 14,539,696 217,138 Equity securities, market value 129,530 113,506 16,024 - Equity securities, fair value 963,572 941,739 21,833 - Liabilities: Equity index put option contracts $ 12,477 $ - $ - $ 12,477 Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2016 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,130,315 $ - $ 1,130,315 $ - Obligations of U.S. States and political subdivisions 729,984 - 729,984 - Corporate securities 5,155,281 - 5,090,084 65,197 Asset-backed securities 488,648 - 488,648 - Mortgage-backed securities Commercial 306,932 - 306,932 - Agency residential 2,405,469 - 2,405,469 - Non-agency residential 641 - 641 - Foreign government securities 1,258,160 - 1,258,160 - Foreign corporate securities 2,631,978 - 2,629,440 2,538 Total fixed maturities, market value 14,107,408 - 14,039,673 67,735 Equity securities, market value 119,067 105,507 13,560 - Equity securities, fair value 1,010,085 949,523 60,562 - Liabilities: Equity index put option contracts $ 22,059 $ - $ - $ 22,059
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	December 31, 2017 December 31, 2016 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities CMBS Corporate Total Beginning balance $ 65,197 $ 2,538 $ 67,735 $ 3,933 $ - $ 1,593 $ 5,526 Total gains or (losses) (realized/unrealized) Included in earnings 1,655 356 2,011 100 - (1,193 ) (1,093 ) Included in other comprehensive income (loss) (992 ) 46 (946 ) 41 16 - 57 Purchases, issuances and settlements 144,326 4,800 149,126 63,054 (44 ) 2,138 65,148 Transfers in and/or (out) of Level 3 - (788 ) (788 ) (1,931 ) 28 - (1,903 ) Ending balance $ 210,186 $ 6,952 $ 217,138 $ 65,197 $ - $ 2,538 $ 67,735 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.)
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts	Years Ended December 31, (Dollars in thousands) 2017 2016 Liabilities: Balance, beginning of period $ 22,059 $ 40,705 Total (gains) or losses (realized/unrealized) Included in earnings (9,581 ) (18,647 ) Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 12,477 $ 22,059 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, 2017
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Credit facility fees incurred $ 420 $ 793 $ 756
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 538,214 12/31/2018 600,000 478,233 12/31/2017 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 538,214 $ 800,000 $ 478,233
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 250,000 $ 3,297 2/28/2018 $ 200,000 $ 4,058 2/28/2017 3,672 11/24/2018 3,672 11/24/2017 73,626 12/31/2018 69,404 12/31/2017 344 8/30/2019 269 8/30/2018 93,855 12/30/2021 1,163 12/31/2018 - 93,180 12/30/2020 Total Citibank Bilateral Agreement $ 250,000 $ 174,794 $ 200,000 $ 171,746
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At December 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 145,000 £ - £ 140,000 £ 130,606 12/31/2019 - - - - Total Lloyd's Bank Credit Facility £ 145,000 £ - £ 140,000 £ 130,606

Senior Notes (Tables)

Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2017
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	December 31, 2017 December 31, 2016 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,834 $ 420,340 $ 396,714 $ 383,612
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Interest expense incurred $ 19,472 $ 19,472 $ 19,472

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	12 Months Ended
	Dec. 31, 2017
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date December 31, 2017 December 31, 2016 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,561 $ 233,072 $ 236,462 $ 204,636
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Interest expense incurred $ 11,498 $ 15,749 $ 15,749

Collateralized Reinsurance An40

Collateralized Reinsurance And Trust Agreements (Tables)	12 Months Ended
	Dec. 31, 2017
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Years Ended December 31, Mt. Logan Re Segregated Accounts 2017 2016 2015 (Dollars in thousands) Ceded written premiums 228,514 197,537 234,001 Ceded earned premiums 226,505 191,568 226,385 Ceded losses and LAE 323,664 44,802 40,807 Assumed written premiums 11,984 14,563 15,421 Assumed earned premiums 11,984 14,563 15,421 Assumed losses and LAE - - -

Operating Lease Agreements (Tab

Operating Lease Agreements (Tables)	12 Months Ended
	Dec. 31, 2017
Operating Lease Agreements [Abstract]
Future Minimum Rental Commitments	(Dollars in thousands) 2018 $ 16,990 2019 17,964 2020 17,115 2021 8,035 2022 7,669 Thereafter 24,668 Net commitments $ 92,440 (Some amounts may not reconcile due to rounding.)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Taxes [Abstract]
Components Of The Provision	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Current tax expense (benefit): U.S. $ (117,173 ) $ 30,971 $ 90,486 Non-U.S. 2,849 4,228 14,811 Total current tax expense (benefit) (114,324 ) 35,199 105,297 Deferred tax expense (benefit): U.S. 49,763 70,995 28,724 Non-U.S. 777 (2,694 ) - Total deferred tax expense (benefit) 50,540 68,301 28,724 Total income tax expense (benefit) $ (63,784 ) $ 103,500 $ 134,021 (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, (Dollars in thousands) 2017 2016 2015 U.S. Non-U.S. U.S. Non-U.S. U.S. Non-U.S. Underwriting gain (loss) $ (516,167 ) $ 308,646 $ 208,821 $ 480,602 $ 294,386 $ 493,025 Net investment income 255,310 287,588 230,691 242,393 234,709 238,763 Net realized capital gains (losses) 148,099 5,095 (16,465 ) 9,249 (159,268 ) (24,879 ) Net derivative gain (loss) - 9,581 - 18,647 - 6,317 Corporate expenses (7,394 ) (18,529 ) (8,276 ) (18,955 ) (7,179 ) (16,075 ) Interest, fee and bond issue cost amortization expense (31,183 ) (420 ) (35,435 ) (793 ) (35,434 ) (756 ) Other income (expense) 30,325 (65,767 ) (5,536 ) (5,101 ) 27,706 60,574 Pre-tax income (loss) $ (121,010 ) $ 526,194 $ 373,801 $ 726,043 $ 354,920 $ 756,970 Expected tax provision at the applicable statutory rate(s) (42,355 ) 6,843 130,830 2,387 124,221 14,848 Increase (decrease) in taxes resulting from: Tax exempt income (8,488 ) - (9,078 ) - (10,004 ) - Dividend received deduction (4,639 ) - (4,913 ) - (5,364 ) - Proration 1,760 - 1,931 - 2,160 - Affiliated preferred stock dividends 10,861 - 10,861 - 13,608 - Creditable foreign premium tax (7,515 ) - (6,134 ) - (7,492 ) - Tax audit settlement (11,516 ) - (18,644 ) - - - Share based compensation tax benefits formerly in APIC (6,716 ) (235 ) - - - - Impact of U.S. tax reform 8,246 - - - - - Impact of prior year accounting adjustment (8,986 ) - - - - - Other 1,938 (2,982 ) (2,887 ) (853 ) 2,081 (37 ) Total income tax provision $ (67,410 ) $ 3,626 $ 101,966 $ 1,534 $ 119,210 $ 14,811 (Some amounts may not reconcile due to rounding.)
Net Deferred Income Tax Assets	Years Ended December 31, (Dollars in thousands) 2017 2016 Deferred tax assets: Unearned premium reserves $ 55,034 $ 37,573 Loss reserves 52,649 104,547 Net unrealized losses on benefit plans 19,120 35,271 Foreign tax credits 15,914 - Benefit plan liability 10,417 14,576 Net operating loss carryforward 9,645 6,341 Uncollectible reinsurance reserves 3,320 5,534 Deferred expenses 1,759 2,884 Unrealized foreign currency losses 1,550 27,410 Investment impairments 1,144 3,093 Alternative minimum tax credits 363 - Other assets 10,494 14,843 Total deferred tax assets 181,409 252,071 Deferred tax liabilities: Deferred acquisition costs 64,997 26,652 Net fair value income 58,983 78,740 Net unrealized investment gains 11,576 20,698 Gain on tender of debt 3,287 10,958 Partnership investments 2,149 11,912 Other liabilities 2,174 3,086 Total deferred tax liabilities 143,165 152,045 Net deferred tax assets 38,244 100,026 Less: Valuation allowance (9,560 ) (3,846 ) Total net deferred tax assets $ 28,684 $ 96,181 (Some amounts may not reconcile due to rounding.)

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2017
Reinsurance [Abstract]
Premiums Written And Earned And Incurred Losses And LAE	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Written premiums: Direct $ 2,083,555 $ 1,819,588 $ 1,569,791 Assumed 5,090,367 4,214,286 4,321,922 Ceded (929,261 ) (762,969 ) (709,402 ) Net written premiums $ 6,244,661 $ 5,270,905 $ 5,182,311 Premiums earned: Direct $ 1,825,705 $ 1,694,702 $ 1,491,163 Assumed 4,945,522 4,361,944 4,500,526 Ceded (833,387 ) (736,180 ) (698,847 ) Net premiums earned $ 5,937,840 $ 5,320,466 $ 5,292,842 Incurred losses and LAE: Direct $ 1,311,682 $ 1,496,455 $ 1,268,896 Assumed 3,909,816 2,121,902 2,152,633 Ceded (698,917 ) (478,728 ) (356,814 ) Net incurred losses and LAE $ 4,522,581 $ 3,139,629 $ 3,064,715

Comprehensive Income (Loss) (Ta

Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2017
Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Years Ended December 31, 2017 2016 2015 (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 $ (81,915 ) $ 21,597 $ (60,318 ) $ 65,645 $ (13,961 ) $ 51,684 $ (333,657 ) $ 54,502 $ (279,155 ) URA(D) on securities - OTTI (5,618 ) 1,588 (4,030 ) 7,734 (1,789 ) 5,945 8,411 (3,383 ) 5,028 Reclassification of net realized losses (gains) included in net income (loss) (7,258 ) 308 (6,950 ) 23,232 (8,114 ) 15,118 131,211 (37,523 ) 93,688 Foreign currency translation adjustments 142,054 (20,137 ) 121,917 (53,802 ) (1,539 ) (55,341 ) (140,918 ) 29,388 (111,530 ) Benefit plan actuarial net gain (loss) 1,300 (273 ) 1,027 (11,520 ) 4,032 (7,488 ) 8,740 (3,059 ) 5,681 Reclassification of benefit plan liability amortization included in net income (loss) 8,426 (2,949 ) 5,477 7,805 (2,732 ) 5,073 9,563 (3,347 ) 6,216 Total other comprehensive income (loss) $ 56,989 $ 134 $ 57,123 $ 39,094 $ (24,103 ) $ 14,991 $ (316,650 ) $ 36,578 $ (280,072 )
Reclassification From Accumulated Other Comprehensive Income	Years Ended December 31, Affected line item within the statements of AOCI component 2017 2016 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ (7,258 ) $ 23,232 Other net realized capital gains (losses) 308 (8,114 ) Income tax expense (benefit) $ (6,950 ) $ 15,118 Net income (loss) Benefit plan net gain (loss) $ 8,426 $ 7,805 Other underwriting expenses (2,949 ) (2,732 ) Income tax expense (benefit) $ 5,477 $ 5,073 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) 2017 2016 Beginning balance of URA (D) on securities $ 115,558 $ 42,811 Current period change in URA (D) of investments - temporary (67,268 ) 66,802 Current period change in URA (D) of investments - non-credit OTTI (4,030 ) 5,945 Reclass due to early adoption of ASU 2018-02 5,709 - Ending balance of URA (D) on securities 49,969 115,558 Beginning balance of foreign currency translation adjustments (266,818 ) (211,477 ) Current period change in foreign currency translation adjustments 121,917 (55,341 ) Reclass due to early adoption of ASU 2018-02 5,970 - Ending balance of foreign currency translation adjustments (138,931 ) (266,818 ) Beginning balance of benefit plan net gain (loss) (65,504 ) (63,089 ) Current period change in benefit plan net gain (loss) 6,504 (2,415 ) Reclass due to early adoption of ASU 2018-02 (12,929 ) - Ending balance of benefit plan net gain (loss) (71,929 ) (65,504 ) Ending balance of accumulated other comprehensive income (loss) $ (160,891 ) $ (216,764 ) (Some amounts may not reconcile due to rounding.)

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Summary Of Contributions To Defined Benefit Pension Plans	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Company contributions $ 10,534 $ 30,821 $ 5,949
Summary Of Pension Expense	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Pension expense $ 16,299 $ 17,188 $ 22,682
Summary Of Accumulated Benefit Obligation	At December 31, (Dollars in thousands) 2017 2016 Qualified Plan $ 245,430 $ 211,720 Non-qualified Plan 24,482 21,123 Total $ 269,912 $ 232,843 (Some amounts may not reconcile due to rounding.)
Projected Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in thousands) 2017 2016 Qualified Plan Projected benefit obligation $ 291,720 $ 254,320 Fair value of plan assets 210,267 171,506 Non-qualified Plan Projected benefit obligation $ 24,482 $ 27,534 Fair value of plan assets - -
Accumulated Benefit Obligations In Excess Of Plan Assets	At December 31, (Dollars in thousands) 2017 2016 Qualified Plan Accumulated benefit obligation $ 245,430 $ 211,720 Fair value of plan assets 210,267 171,506 Non-qualified Plan Accumulated benefit obligation $ 24,482 $ 21,123 Fair value of plan assets - -
Incurred Expenses Related To Defined Contribution Plans For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Incurred expenses $ 7,167 $ 6,058 $ 5,468
Incurred Expenses Related To Defined Contribution Plans For Non-U.S. Employees	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Incurred expenses $ 1,849 $ 1,560 $ 1,423
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 $ 614 $ (476 ) b. Effect on accumulated post-retirement benefit obligation 7,313 (5,674 )
Post-Retirement Benefit Expenses	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Post-retirement benefit expenses $ 2,814 $ 2,293 $ 3,280
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Summary Of Status Of Plan	Years Ended December 31, (Dollars in thousands) 2017 2016 Change in projected benefit obligation: Benefit obligation at beginning of year $ 281,853 $ 254,022 Service cost 10,949 10,924 Interest cost 10,034 9,485 Actuarial (gain)/loss 24,679 12,155 Curtailment (6,209 ) - Benefits paid (5,104 ) (4,733 ) Projected benefit obligation at end of year 316,202 281,853 Change in plan assets: Fair value of plan assets at beginning of year 171,506 135,087 Actual return on plan assets 33,331 10,331 Actual contributions during the year 10,534 30,821 Administrative expenses paid - - Benefits paid (5,104 ) (4,733 ) Fair value of plan assets at end of year 210,267 171,506 Funded status at end of year $ (105,935 ) $ (110,348 ) (Some amounts may not reconcile due to rounding.)
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in thousands) 2017 2016 Other assets (due beyond one year) $ - $ - Other liabilities (due within one year) (3,871 ) (2,371 ) Other liabilities (due beyond one year) (102,065 ) (107,977 ) Net amount recognized in the consolidated balance sheets $ (105,935 ) $ (110,348 ) (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) 2017 2016 Prior service cost $ - $ - Accumulated income (loss) (86,788 ) (96,965 ) Accumulated other comprehensive income (loss) $ (86,788 ) $ (96,965 ) (Some amounts may not reconcile due to rounding.)
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in thousands) 2017 2016 Other comprehensive income (loss) at December 31, prior year $ (96,965 ) $ (91,920 ) Net gain (loss) arising during period (4,398 ) (12,982 ) Recognition of amortizations in net periodic benefit cost: Prior service cost - - Actuarial loss 8,366 7,937 Curtailment loss recognized 6,209 - Other comprehensive income (loss) at December 31, current year $ (86,788 ) $ (96,965 ) (Some amounts may not reconcile due to rounding.)
Net Periodic Benefit Cost For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Service cost $ 10,949 $ 10,924 $ 12,511 Interest cost 10,034 9,485 10,759 Expected return on assets (13,050 ) (11,158 ) (11,620 ) Amortization of actuarial loss from earlier periods 8,366 7,937 9,243 Amortization of unrecognized prior service cost - - 21 Settlement - - 1,768 Net periodic benefit cost $ 16,299 $ 17,188 $ 22,682 Other changes recognized in other comprehensive income (loss): Other comprehensive income (loss) attributable to change from prior year (10,177 ) 5,045 Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 6,122 $ 22,233 (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in thousands) 2018 10,205 2019 10,288 2020 12,452 2021 12,331 2022 12,132 Next 5 years 74,239
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, 2017 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 1,031 $ 1,031 $ - $ - Mutual funds, fair value Fixed income (b) 23,361 23,361 - - Equities (c) 159,578 159,578 - - Total $ 183,970 $ 183,970 $ - $ - (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 50% in U.S. securities and 50% 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 90% in U.S. equities and 10% 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, 2016 (Level 1) (Level 2) (Level 3) Assets: Short-term investments, which approximates fair value (a) $ 3,665 $ 3,665 $ - $ - Mutual funds, fair value Fixed income (b) 21,445 21,445 - - Equities (c) 122,213 122,213 - - Total $ 147,323 $ 147,323 $ - $ - (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 50% in U.S. securities and 50% 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 90% in U.S. equities and 10% in international equities.
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Summary Of Status Of Plan	At December 31, (Dollars in thousands) 2017 2016 Change in projected benefit obligation: Benefit obligation at beginning of year $ 32,071 $ 31,687 Service cost 1,570 1,418 Interest cost 1,184 1,007 Amendments (3,526 ) (794 ) Actuarial (gain)/loss 4,038 (668 ) Benefits paid (619 ) (579 ) Benefit obligation at end of year 34,717 32,071 Change in plan assets: Fair value of plan assets at beginning of year - - Employer contributions 619 579 Benefits paid (619 ) (579 ) Fair value of plan assets at end of year - - Funded status at end of year $ (34,717 ) $ (32,071 )
Amounts Recognized In The Consolidated Balance Sheets	At December 31, (Dollars in thousands) 2017 2016 Other liabilities (due within one year) $ (655 ) $ (614 ) Other liabilities (due beyond one year) (34,062 ) (31,457 ) Net amount recognized in the consolidated balance sheets $ (34,717 ) $ (32,071 ) (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) 2017 2016 Accumulated income (loss) $ (8,317 ) $ (4,471 ) Accumulated prior service credit (cost) 4,057 $ 662 Accumulated other comprehensive income (loss) $ (4,260 ) $ (3,809 )
Other Changes In Other Comprehensive Income (Loss)	Years Ended December 31, (Dollars in thousands) 2017 2016 Other comprehensive income (loss) at December 31, prior year $ (3,809 ) $ (5,139 ) Net gain (loss) arising during period (4,038 ) 668 Prior Service credit (cost) arising during period 3,526 794 Recognition of amortizations in net periodic benefit cost: Actuarial loss (gain) 192 - Prior service cost (131 ) (132 ) Other comprehensive income (loss) at December 31, current year $ (4,260 ) $ (3,809 )
Net Periodic Benefit Cost For U.S. Employees	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Service cost $ 1,570 $ 1,418 $ 1,794 Interest cost 1,184 1,007 1,187 Net loss recognition (131 ) (132 ) 300 Net gain recognition 192 - - Net periodic cost $ 2,814 $ 2,293 $ 3,280 Other changes recognized in other comprehensive income (loss): Other comprehensive gain (loss) attributable to change from prior year 451 (1,330 ) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 3,265 $ 963 (Some amounts may not reconcile due to rounding.)
Expected Benefit Payments	(Dollars in thousands) 2018 $ 655 2019 765 2020 877 2021 975 2022 1,156 Next 5 years 7,965

Dividend Restrictions And Sta46

Dividend Restrictions And Statutory Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Dividend Restrictions And Statutory Financial Information [Abstract]
Regulatory Targeted Capital And The Actual Statutory Capital	Bermuda Re (1) Everest Re (2) At December 31, At December 31, (Dollars in thousands) 2017 (3) 2016 (3) 2017 2016 Regulatory targeted capital $ - $ 2,025,717 $ 2,076,892 $ 1,411,440 Actual capital $ 3,085,882 $ 2,950,517 $ 3,391,852 $ 3,635,121 (1) (2) (3)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At December 31, (Dollars in thousands) 2017 2016 The Prudential Insurance Company of America $ 144,618 $ 146,507 Unaffiliated life insurance company 34,444 33,860

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2017
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, 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 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2016 648,034 $ 85.61 Granted - - Exercised 187,940 87.31 Forfeited/Cancelled/Expired 5,100 88.25 Outstanding at December 31, 2016 454,994 84.88 3.7 $ 59,843 Exercisable at December 31, 2016 410,694 84.50 3.5 $ 54,169 Weighted- Weighted- Average Average Remaining Aggregate (Aggregate Intrinsic Value in thousands) Exercise Contractual Intrinsic Options Shares Price/Share Term Value Outstanding at January 1, 2015 888,184 $ 86.05 Granted - - Exercised 230,350 87.21 Forfeited/Cancelled/Expired 9,800 87.68 Outstanding at December 31, 2015 648,034 85.61 4.5 $ 64,352 Exercisable at December 31, 2015 495,334 84.94 4.1 $ 49,517
Share Options Outstanding And Exercisable	At December 31, 2017 Options Outstanding Options Exercisable Weighted- Average Weighted- Weighted- Number Remaining Average Number Average Range of Outstanding Contractual Exercise Exercisable Exercise Exercise Prices at 12/31/17 Life Price at 12/31/17 Price $ 71.7150 78.1700 79,760 1.1 $ 71.72 79,760 $ 71.72 $ 78.1800 85.6300 61,900 2.1 84.63 61,900 84.63 $ 85.6400 87.4700 88,590 3.1 86.62 88,590 86.62 $ 87.4800 89.4100 110,060 4.1 88.32 110,060 88.32 $ 89.4200 110.1300 20,054 1.1 97.41 20,054 97.41 360,364 2.7 84.10 360,364 84.10
Summary Of Company's Non-Vested Shares And Changes	Years Ended December 31, 2017 2016 2015 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, 435,338 $ 164.21 435,336 $ 143.02 467,745 $ 120.84 Granted 160,185 234.01 173,546 186.37 156,262 178.80 Vested 152,397 151.80 145,834 130.54 154,387 113.12 Forfeited 21,865 187.82 27,710 147.32 34,284 138.19 Outstanding at December 31, 421,261 194.01 435,338 164.21 435,336 143.02
Company's Non-Vested Performance Share Unit Awards	Year Ended December 31, 2017 2016 2015 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, 21,835 $ 182.50 10,705 $ 178.84 - $ - Granted 11,245 234.03 11,130 186.02 10,705 178.84 Vested - - - - - - Forfeited - - - - - - Outstanding at December 31, 33,080 200.02 21,835 182.50 10,705 178.84

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	U.S. Reinsurance Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 2,592,972 $ 2,125,792 $ 2,147,892 Net written premiums 2,245,422 1,970,575 1,855,853 Premiums earned $ 2,181,160 $ 2,072,155 $ 1,952,680 Incurred losses and LAE 1,632,795 1,068,475 825,081 Commission and brokerage 462,487 465,953 493,261 Other underwriting expenses 55,881 54,107 50,087 Underwriting gain (loss) $ 29,997 $ 483,620 $ 584,251 International Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 1,316,701 $ 1,230,683 $ 1,334,206 Net written premiums 1,229,597 1,082,712 1,208,978 Premiums earned $ 1,202,043 $ 1,119,121 $ 1,251,111 Incurred losses and LAE 1,059,640 486,550 749,891 Commission and brokerage 287,688 283,447 298,180 Other underwriting expenses 38,844 35,512 34,303 Underwriting gain (loss) $ (184,129 ) $ 313,612 $ 168,737 Bermuda Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 1,205,001 $ 890,375 $ 877,328 Net written premiums 1,139,082 831,931 791,594 Premiums earned $ 1,093,250 $ 837,964 $ 822,391 Incurred losses and LAE 735,292 461,909 456,448 Commission and brokerage 303,707 233,989 215,992 Other underwriting expenses 38,011 36,331 36,017 Underwriting gain (loss) $ 16,240 $ 105,735 $ 113,934 Insurance Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Gross written premiums $ 2,059,248 $ 1,787,024 $ 1,532,287 Net written premiums 1,630,560 1,385,687 1,325,886 Premiums earned $ 1,461,387 $ 1,291,226 $ 1,266,660 Incurred losses and LAE 1,094,854 1,122,695 1,033,295 Commission and brokerage 250,081 205,303 176,213 Other underwriting expenses 186,081 176,772 136,661 Underwriting gain (loss) $ (69,629 ) $ (213,544 ) $ (79,509 )
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 Underwriting gain (loss) $ (207,521 ) $ 689,423 $ 787,412 Net investment income 542,898 473,085 473,473 Net realized capital gains (losses) 153,194 (7,216 ) (184,147 ) Net derivative gain (loss) 9,581 18,647 6,317 Corporate expenses (25,923 ) (27,231 ) (23,254 ) Interest, fee and bond issue cost amortization expense (31,603 ) (36,228 ) (36,191 ) Other income (expense) (35,442 ) (10,636 ) 88,280 Income (loss) before taxes $ 405,184 $ 1,099,844 $ 1,111,890
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Years Ended December 31, (Dollars in thousands) 2017 2016 2015 United Kingdom $ 730,826 $ 688,598 $ 740,763

Unaudited Quarterly Financial50

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2017
Unaudited Quarterly Financial Data [Abstract]
Summary Of Quarterly Financial Data	2017 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,600,944 $ 1,601,649 $ 2,044,902 $ 1,926,427 Net written premiums 1,413,814 1,339,133 1,798,089 1,693,625 Premiums earned 1,312,097 1,369,681 1,598,875 1,657,187 Net investment income 122,289 134,508 136,973 149,128 Net realized capital gains (losses) 52,728 25,268 41,535 33,663 Total claims and underwriting expenses 1,128,944 1,240,100 2,616,340 1,159,977 Net income (loss) 291,643 245,674 (639,374 ) 571,025 Earnings per common share attributable to Everest Re Group: Basic $ 7.12 $ 5.98 $ (15.73 ) $ 13.92 Diluted $ 7.07 $ 5.95 $ (15.73 ) $ 13.85 2016 (Dollars in thousands, except per share amounts) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Operating data: Gross written premiums $ 1,353,189 $ 1,363,351 $ 1,782,616 $ 1,534,719 Net written premiums 1,181,457 1,154,953 1,564,644 1,369,851 Premiums earned 1,218,867 1,288,860 1,371,474 1,441,265 Net investment income 102,524 132,737 122,657 115,167 Net realized capital gains (losses) (74,259 ) 32,658 380 34,005 Total claims and underwriting expenses 1,047,865 1,225,395 1,174,276 1,183,507 Net income (loss) 171,686 155,692 295,394 373,572 Earnings per common share attributable to Everest Re Group: Basic $ 4.03 $ 3.70 $ 7.11 $ 9.14 Diluted $ 4.00 $ 3.67 $ 7.06 $ 9.08

Summary Of Significant Accoun51

Summary Of Significant Accounting Policies (Narrative) (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017USD ($)segmentitemshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)shares
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 | segment		4
Equity index put option contracts sold | item		7
Derivatives, number of indices | item		2
Derivative liability		$ 12,477	$ 22,059
Supplementary Insurance Information, Amortization of Deferred Policy Acquisition Costs		$ 1,303,963	$ 1,188,692	$ 1,183,646
Anti-dilutive options | shares		0	0	0
U.S. tax rate		35.00%
Reclass due to early adoption of Accounting Standards Update 2018-02		$ 1,250
Tax Cut and Jobs Act [Member]
Summary Of Significant Accounting Policies [Line Items]
U.S. tax rate	21.00%
Expired Derivative [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of derivatives | item		1
Derivative maturity date		Jun. 9, 2017
Derivative liability		$ 0
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Options expiration date		Feb. 20, 2018
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Options expiration date		Sep. 19, 2022

Summary Of Significant Accoun52

Summary Of Significant Accounting Policies (Schedule Of Uncollectible Reinsurance Recoverable And Premium Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Abstract]
Reinsurance receivables and premium receivables	$ 23,473	$ 23,360

Summary Of Significant Accoun53

Summary Of Significant Accounting Policies (Schedule Of Deferred Acquisition Costs Amortized To Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Deferred acquisition costs	$ 1,303,963	$ 1,188,692	$ 1,183,646

Summary Of Significant Accoun54

Summary Of Significant Accounting Policies (Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Abstract]
Net income (loss)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	$ 468,968	$ 996,344	$ 977,869
Less: dividends declared-common shares and nonvested common shares									(207,242)	(195,384)	(175,107)
Undistributed earnings									$ 261,725	$ 800,960	$ 802,762
Percentage allocated to common shareholders									98.90%	98.90%	98.90%
Net income (loss) available to common stockholders, total									$ 258,952	$ 792,415	$ 794,309
Add: dividends declared-common shareholders									205,182	193,413	173,367
Numerator for basic and diluted earnings per common share									$ 464,134	$ 985,829	$ 967,676
Denominator for basic earnings per weighted-average common shares									40,595	41,329	43,415
Effect of dilutive securities: Options									248	300	380
Denominator for diluted earnings per adjusted weighted-average common shares									40,843	41,628	43,795
Basic	$ 13.92	$ (15.73)	$ 5.98	$ 7.12	$ 9.14	$ 7.11	$ 3.70	$ 4.03	$ 11.43	$ 23.85	$ 22.29
Diluted	$ 13.85	$ (15.73)	$ 5.95	$ 7.07	$ 9.08	$ 7.06	$ 3.67	$ 4	$ 11.36	$ 23.68	$ 22.10
Basic weighted-average common shares outstanding									40,595	41,329	43,415
Basic weighted-average common shares outstanding and nonvested common shares expected to vest									41,030	41,774	43,877

Summary Of Significant Accoun55

Summary Of Significant Accounting Policies ( Change In Fair Value Of The Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 12,477	$ 22,059
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	$ 12,477	$ 22,059

Summary Of Significant Accoun56

Summary Of Significant Accounting Policies (Changes In Fair Value Of The Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Option Indexed to Issuer's Equity [Line Items]
Net derivative gain (loss)	$ 9,581	$ 18,647	$ 6,317
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)	$ 9,581	$ 18,647	$ 6,317

Summary Of Signigicant Accounti

Summary Of Signigicant Accounting Policies (Schedule of Effect of Newly Adopted Accounting Policies, Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS:
Short-term investments	$ 509,682	$ 431,478	$ 799,684
Total investments and cash	18,626,535	17,483,089	16,676,405
Premiums receivable	1,844,881	1,485,990	1,483,090
Reinsurance receivables	1,348,226	1,018,325	894,037
Deferred acquisition costs	411,587	344,052	372,351
Prepaid reinsurance premiums	288,211	191,768	164,971
Other assets	382,283	263,459	321,818
TOTAL ASSETS	23,591,792	21,321,504	20,550,828
LIABILITIES:
Funds held under reinsurance treaties	18,030	21,278	13,544
Commission reserves	30,660	70,335	60,098
Other net payable to reinsurers	218,017	190,986	173,087
Other liabilities	332,620	331,877	261,322
Total liabilities	15,222,560	13,246,108	12,942,243
NONCONTROLLING INTERESTS:
TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY	$ 23,591,792	$ 21,321,504	20,550,828
As Previously Reported [Member]
ASSETS:
Short-term investments			1,795,455
Total investments and cash			17,672,176
Premiums receivable			1,479,293
Reinsurance receivables			840,420
Deferred acquisition costs			373,072
Prepaid reinsurance premiums			157,424
Other assets			265,634
TOTAL ASSETS			21,426,175
LIABILITIES:
Funds held under reinsurance treaties			88,544
Commission reserves			79,849
Other net payable to reinsurers			166,822
Other liabilities			291,322
Total liabilities			13,060,729
NONCONTROLLING INTERESTS:
Redeemable noncontrolling interest - Mt. Logan Re			756,861
TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY			21,426,175
Effect Of Adoption Of New Accounting Policy [Member]
ASSETS:
Short-term investments			(995,771)
Total investments and cash			(995,771)
Premiums receivable			3,797
Reinsurance receivables			53,617
Deferred acquisition costs			(721)
Prepaid reinsurance premiums			7,547
Other assets			56,184
TOTAL ASSETS			(875,347)
LIABILITIES:
Funds held under reinsurance treaties			(75,000)
Commission reserves			(19,751)
Other net payable to reinsurers			6,265
Other liabilities			(30,000)
Total liabilities			(118,486)
NONCONTROLLING INTERESTS:
Redeemable noncontrolling interest - Mt. Logan Re			(756,861)
TOTAL LIABILITIES, NONCONTROLLING INTERESTS AND SHAREHOLDERS' EQUITY			$ (875,347)

Summary Of Significant Accoun58

Summary Of Significant Accounting Policies (Schedule of Effect of Newly Adopted Accounting Policies, Operations and Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES:
Premiums earned	$ 1,657,187	$ 1,598,875	$ 1,369,681	$ 1,312,097	$ 1,441,265	$ 1,371,474	$ 1,288,860	$ 1,218,867	$ 5,937,840	$ 5,320,466	$ 5,292,842
Net investment income	149,128	136,973	134,508	122,289	115,167	122,657	132,737	102,524	542,898	473,085	473,473
Other income (expense)									(35,442)	(10,636)	88,280
Total revenues									6,608,071	5,794,346	5,676,765
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses									4,522,581	3,139,629	3,064,715
Commission, brokerage, taxes and fees									1,303,963	1,188,692	1,183,646
Other underwriting expenses									318,817	302,722	257,069
Total claims and expenses	1,159,977	2,616,340	1,240,100	1,128,944	1,183,507	1,174,276	1,225,395	1,047,865	6,202,887	4,694,502	4,564,875
INCOME (LOSS) BEFORE TAXES									405,184	1,099,844	1,111,890
NET INCOME (LOSS)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	$ 468,968	$ 996,344	977,869
As Previously Reported [Member]
REVENUES:
Premiums earned											5,481,459
Net investment income											473,825
Other income (expense)											60,435
Total revenues											5,837,889
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses											3,101,915
Commission, brokerage, taxes and fees											1,202,036
Other underwriting expenses											265,984
Total claims and expenses											4,629,380
INCOME (LOSS) BEFORE TAXES											1,208,509
NET INCOME (LOSS)											1,074,488
Net Income (Loss) Attributable to Noncontrolling Interest											(96,619)
NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP											977,869
Effect Of Adoption Of New Accounting Policy [Member]
REVENUES:
Premiums earned											(188,617)
Net investment income											(352)
Other income (expense)											27,845
Total revenues											(161,124)
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses											(37,200)
Commission, brokerage, taxes and fees											(18,390)
Other underwriting expenses											(8,915)
Total claims and expenses											(64,505)
INCOME (LOSS) BEFORE TAXES											(96,619)
NET INCOME (LOSS)											(96,619)
Net Income (Loss) Attributable to Noncontrolling Interest											96,619
NET INCOME (LOSS) ATTRIBUTABLE TO EVEREST RE GROUP											$ (977,869)

Summary Of Significant Accoun59

Summary Of Significant Accounting Policies (Schedule of Effect of Newly Adopted Accounting Policies, Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	$ 468,968	$ 996,344	$ 977,869
Decrease (increase) in premiums receivable									(338,335)	(15,655)	(98,211)
Decrease (increase) in funds held by reinsureds, net									(31,104)	22,219	(43,775)
Decrease (increase) in reinsurance receivables									(238,485)	(202,950)	(265,103)
Decrease (increase) in prepaid reinsurance premiums									(86,049)	(32,455)	(21,819)
Increase (decrease) in other net payable to reinsurers									10,071	26,200	43,727
Change in other assets and liabilities, net									(66,998)	(45,605)	2,671
Net cash provided by (used in) operating activities									1,162,693	1,383,600	1,108,235
CASH FLOWS FROM INVESTING ACTIVITIES:
Net change in short-term investments									(73,923)	368,977	341,733
Net cash provided by (used in) investing activities									(732,577)	(657,873)	(681,101)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards									(12,906)	(10,595)	(11,601)
Net cash provided by (used in) financing activities									(275,458)	(581,516)	(573,170)
EFFECT OF EXCHANGE RATE CHANGES ON CASH									$ (1,513)	54,053	(7,780)
Accounting Standards Update 2016-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Change in other assets and liabilities, net										(45,609)	2,667
Net cash provided by (used in) operating activities										1,383,600	1,108,235
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards										(10,595)	(11,601)
Net cash provided by (used in) financing activities										(581,516)	(573,170)
Accounting Standards Update 2015-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)											977,869
Decrease (increase) in premiums receivable											(98,211)
Decrease (increase) in funds held by reinsureds, net											(43,775)
Decrease (increase) in reinsurance receivables											(265,103)
Decrease (increase) in prepaid reinsurance premiums											(21,819)
Increase (decrease) in other net payable to reinsurers											43,727
Change in other assets and liabilities, net											(8,934)
Net cash provided by (used in) operating activities											1,096,634
CASH FLOWS FROM INVESTING ACTIVITIES:
Net change in short-term investments											341,733
Net cash provided by (used in) investing activities											(681,101)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by (used in) financing activities											(561,569)
EFFECT OF EXCHANGE RATE CHANGES ON CASH											(7,780)
As Previously Reported [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)											1,074,488
As Previously Reported [Member] | Accounting Standards Update 2016-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Change in other assets and liabilities, net										(56,204)	(8,934)
Net cash provided by (used in) operating activities										1,373,005	1,096,634
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by (used in) financing activities										(570,921)	(561,569)
As Previously Reported [Member] | Accounting Standards Update 2015-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)											1,074,488
Decrease (increase) in premiums receivable											(93,837)
Decrease (increase) in funds held by reinsureds, net											31,225
Decrease (increase) in reinsurance receivables											(240,414)
Decrease (increase) in prepaid reinsurance premiums											(14,486)
Increase (decrease) in other net payable to reinsurers											38,262
Change in other assets and liabilities, net											264
Net cash provided by (used in) operating activities											1,308,382
CASH FLOWS FROM INVESTING ACTIVITIES:
Net change in short-term investments											(98,903)
Net cash provided by (used in) investing activities											(1,121,737)
CASH FLOWS FROM FINANCING ACTIVITIES:
Third party investment in redeemable noncontrolling interest											266,848
Subscription Advances For Third Party Redeemable Noncontrolling Interest											30,000
Dividends paid on third party investment in redeemable noncontrolling interest											(68,158)
Net cash provided by (used in) financing activities											(332,879)
EFFECT OF EXCHANGE RATE CHANGES ON CASH											(7,582)
Effect Of Adoption Of New Accounting Policy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)											(96,619)
Effect Of Adoption Of New Accounting Policy [Member] | Accounting Standards Update 2016-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Change in other assets and liabilities, net										10,595	11,601
Net cash provided by (used in) operating activities										10,595	11,601
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards										(10,595)	(11,601)
Net cash provided by (used in) financing activities										$ (10,595)	(11,601)
Effect Of Adoption Of New Accounting Policy [Member] | Accounting Standards Update 2015-02 [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)											(96,619)
Decrease (increase) in premiums receivable											(4,374)
Decrease (increase) in funds held by reinsureds, net											(75,000)
Decrease (increase) in reinsurance receivables											(24,689)
Decrease (increase) in prepaid reinsurance premiums											(7,333)
Increase (decrease) in other net payable to reinsurers											5,465
Change in other assets and liabilities, net											(9,198)
Net cash provided by (used in) operating activities											(211,748)
CASH FLOWS FROM INVESTING ACTIVITIES:
Net change in short-term investments											440,636
Net cash provided by (used in) investing activities											440,636
CASH FLOWS FROM FINANCING ACTIVITIES:
Third party investment in redeemable noncontrolling interest											(266,848)
Subscription Advances For Third Party Redeemable Noncontrolling Interest											(30,000)
Dividends paid on third party investment in redeemable noncontrolling interest											68,158
Net cash provided by (used in) financing activities											(228,690)
EFFECT OF EXCHANGE RATE CHANGES ON CASH											$ (198)

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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%
Aggregate market value of investments in unrealized loss position	$ 8,233,115	$ 6,211,700
Gross unrealized losses on investments in unrealized loss position	182,553	220,621
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	72,416	91,871
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	110,137	128,750
Additional contractual commitments	646,645
Other invested assets	1,631,850	$ 1,333,129
Securities with a carrying value	$ 1,482,707
Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	8.90%	1.10%
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Limited partnership financial reporting lag time, months	1 month
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Limited partnership financial reporting lag time, months	3 months
Parent Company [Member]
Schedule of Available-for-sale Securities [Line Items]
Other invested assets	$ 102,559	$ 145,036
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	68,107	85,078
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	103,739
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	8,119,609	6,106,193
Gross unrealized losses on investments in unrealized loss position	179,181	207,837
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	72,416	91,871
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	106,765	115,966
Foreign Exchange Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		112,132
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]
Other invested assets	$ 447,915	$ 378,862

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, 2017	Dec. 31, 2016
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 14,689,598	$ 13,932,613
Unrealized Appreciation		246,417	382,632
Unrealized Depreciation		(179,181)	(207,837)
Market Value		14,756,834	14,107,408
OTTI in AOCI	[1]	3,616	9,235
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,540,952	1,115,208
Unrealized Appreciation		9,816	20,410
Unrealized Depreciation		(14,076)	(5,303)
Market Value		1,536,692	1,130,315
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		563,790	723,938
Unrealized Appreciation		22,123	18,016
Unrealized Depreciation		(444)	(11,970)
Market Value		585,469	729,984
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,658,456	5,059,388
Unrealized Appreciation		81,724	131,651
Unrealized Depreciation		(41,175)	(35,758)
Market Value		5,699,005	5,155,281
OTTI in AOCI	[1]	2,488	7,936
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		532,473	488,824
Unrealized Appreciation		869	1,110
Unrealized Depreciation		(1,982)	(1,286)
Market Value		531,360	488,648
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		235,794	308,827
Unrealized Appreciation		616	1,983
Unrealized Depreciation		(2,369)	(3,878)
Market Value		234,041	306,932
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,236,361	2,415,901
Unrealized Appreciation		10,379	17,478
Unrealized Depreciation		(35,838)	(27,910)
Market Value		2,210,902	2,405,469
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		497	642
Unrealized Appreciation		41	44
Unrealized Depreciation		(44)	(45)
Market Value		494	641
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,305,070	1,254,175
Unrealized Appreciation		43,804	61,226
Unrealized Depreciation		(34,847)	(57,241)
Market Value		1,314,027	1,258,160
OTTI in AOCI	[1]	178	115
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,616,205	2,565,710
Unrealized Appreciation		77,045	130,714
Unrealized Depreciation		(48,406)	(64,446)
Market Value		2,644,844	2,631,978
OTTI in AOCI	[1]	950	1,184
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		130,287	129,553
Unrealized Appreciation		2,615	2,298
Unrealized Depreciation		(3,372)	(12,784)
Market Value		$ 129,530	$ 119,067
[1]	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

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, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 14,689,598	$ 13,932,613
Fixed maturity securities - available for sale, Market Value	14,756,834	14,107,408
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	1,041,885	956,945
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	7,545,731	6,769,585
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	2,214,473	2,020,215
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	882,384	971,674
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,050,094	966,970
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	7,554,248	6,870,056
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,231,456	2,052,733
Fixed maturity securities - available for sale, Due after ten years, Market Value	944,239	1,015,959
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	532,473	488,824
Fixed maturity securities - available for sale, Market Value	531,360	488,648
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	235,794	308,827
Fixed maturity securities - available for sale, Market Value	234,041	306,932
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,236,361	2,415,901
Fixed maturity securities - available for sale, Market Value	2,210,902	2,405,469
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	497	642
Fixed maturity securities - available for sale, Market Value	$ 494	$ 641

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Deferred tax benefit (expense)	$ (50,540)	$ (68,301)	$ (28,724)
Total URA(D) on securities arising during the period	(71,298)	72,747	$ (180,439)
Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(94,791)	96,611
Deferred tax benefit (expense)	21,905	(22,075)
Deferred tax benefit (expense), other-than-temporary impairment	(1,588)	(1,789)
Total URA(D) on securities arising during the period	(71,298)	72,747
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(101,940)	85,972
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(5,618)	7,734
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	9,730	2,845
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 3,037	$ 60

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, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	$ 4,894,476	$ 5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(72,416)	(91,871)
Fixed maturity securities, Greater than 12 months, Market Value	3,338,639	1,031,292
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(110,137)	(128,750)
Fixed maturity securities, Total, Market Value	8,233,115	6,211,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(182,553)	(220,621)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	4,894,476	5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(72,416)	(91,871)
Fixed maturity securities, Greater than 12 months, Market Value	3,225,133	925,785
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(106,765)	(115,966)
Fixed maturity securities, Total, Market Value	8,119,609	6,106,193
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(179,181)	(207,837)
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, Less than 12 months, Market Value	1,077,051	638,740
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(8,380)	(5,303)
Fixed maturity securities, Greater than 12 months, Market Value	224,189
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(5,696)
Fixed maturity securities, Total, Market Value	1,301,240	638,740
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(14,076)	(5,303)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	4,400	221,088
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(27)	(11,486)
Fixed maturity securities, Greater than 12 months, Market Value	37,886	564
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(417)	(484)
Fixed maturity securities, Total, Market Value	42,286	221,652
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(444)	(11,970)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	1,779,292	1,360,743
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(24,942)	(24,023)
Fixed maturity securities, Greater than 12 months, Market Value	700,098	177,153
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(16,233)	(11,735)
Fixed maturity securities, Total, Market Value	2,479,390	1,537,896
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(41,175)	(35,758)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	301,316	150,023
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(1,467)	(565)
Fixed maturity securities, Greater than 12 months, Market Value	72,780	18,786
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(515)	(721)
Fixed maturity securities, Total, Market Value	374,096	168,809
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,982)	(1,286)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	101,821	143,554
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(572)	(3,223)
Fixed maturity securities, Greater than 12 months, Market Value	64,272	7,184
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,797)	(655)
Fixed maturity securities, Total, Market Value	166,093	150,738
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,369)	(3,878)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	610,941	1,618,372
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(4,836)	(22,461)
Fixed maturity securities, Greater than 12 months, Market Value	1,343,547	189,665
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(31,002)	(5,449)
Fixed maturity securities, Total, Market Value	1,954,488	1,808,037
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(35,838)	(27,910)
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Greater than 12 months, Market Value	69	113
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(44)	(45)
Fixed maturity securities, Total, Market Value	69	113
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(44)	(45)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	327,790	360,289
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(12,811)	(12,041)
Fixed maturity securities, Greater than 12 months, Market Value	331,432	236,820
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(22,036)	(45,200)
Fixed maturity securities, Total, Market Value	659,222	597,109
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(34,847)	(57,241)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	691,865	687,599
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(19,381)	(12,769)
Fixed maturity securities, Greater than 12 months, Market Value	450,860	295,500
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(29,025)	(51,677)
Fixed maturity securities, Total, Market Value	1,142,725	983,099
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(48,406)	(64,446)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Greater than 12 months, Market Value	113,506	105,507
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,372)	(12,784)
Fixed maturity securities, Total, Market Value	113,506	105,507
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (3,372)	$ (12,784)

Investments (Summary Of Aggre65

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, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 4,894,476	$ 5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(72,416)	(91,871)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,338,639	1,031,292
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(110,137)	(128,750)
Fixed maturity securities, Total, Market Value	8,233,115	6,211,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(182,553)	(220,621)
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	4,894,476	5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(72,416)	(91,871)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,225,133	925,785
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(106,765)	(115,966)
Fixed maturity securities, Total, Market Value	8,119,609	6,106,193
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(179,181)	(207,837)
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	247,927	178,281
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(962)	(1,122)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	206,113	78,153
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(7,643)	(14,318)
Fixed maturity securities, Total, Market Value	454,040	256,434
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(8,605)	(15,440)
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	2,930,977	2,123,113
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(42,480)	(26,263)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,200,414	538,130
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(52,143)	(84,803)
Fixed maturity securities, Total, Market Value	4,131,391	2,661,243
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(94,623)	(111,066)
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	612,702	680,334
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(20,154)	(22,555)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	292,245	86,631
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12,680)	(8,754)
Fixed maturity securities, Total, Market Value	904,947	766,965
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(32,834)	(31,309)
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	88,792	286,731
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(1,945)	(15,682)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	45,693	7,123
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(941)	(1,221)
Fixed maturity securities, Total, Market Value	134,485	293,854
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,886)	(16,903)
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	301,316	150,023
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(1,467)	(565)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	72,780	18,786
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(515)	(721)
Fixed maturity securities, Total, Market Value	374,096	168,809
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,982)	(1,286)
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	712,762	1,761,926
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(5,408)	(25,684)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,407,888	196,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(32,843)	(6,149)
Fixed maturity securities, Total, Market Value	2,120,650	1,958,888
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (38,251)	$ (31,833)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 559,773	$ 494,312	$ 496,174
Funds held interest income (expense)	11,874	7,853	10,767
Future policy benefit reserve income (expense)	(1,282)	(1,633)	(1,907)
Gross investment income	570,365	500,532	505,034
Investment expenses	(27,467)	(27,447)	(31,561)
Net investment income	542,898	473,085	473,473
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	427,379	410,337	433,097
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	34,523	40,707	45,617
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,177	1,769	1,225
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	83,569	38,647	14,431
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 10,125	$ 2,852	$ 1,804

Investments (Summary Of Compo67

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									$ (7,093)	$ (31,595)	$ (102,199)
Total net realized capital gains (losses)	$ 33,663	$ 41,535	$ 25,268	$ 52,728	$ 34,005	$ 380	$ 32,658	$ (74,259)	153,194	(7,216)	(184,147)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									(7,093)	(31,595)	(102,199)
Gains (losses) from sales									17,714	6,918	(22,310)
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales										(1,586)	24
Gains (losses) from fair value adjustments										1,381	(44)
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									(3,424)	1,426	(6,702)
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									6,969	(13,442)	(7,305)
Gains (losses) from fair value adjustments									138,973	57,686	(45,627)
Sale of Subsidiary										(28,032)
Other Invested Assets [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									61	18
Short-Term Investments [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									$ (6)	$ 10	$ 16

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of fixed maturity securities	$ 2,401,844	$ 1,264,271	$ 1,725,917
Gross gains from sales	58,589	53,093	47,899
Gross losses from sales	(40,875)	(47,761)	(70,185)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of fixed maturity securities	651,433	729,782	642,980
Gross gains from sales	24,809	18,462	27,675
Gross losses from sales	$ (21,264)	$ (30,478)	$ (41,682)

Reserve For Losses, LAE And F69

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) $ in Thousands	Jul. 13, 2015USD ($)	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses		$ 4,815,967	$ 3,434,964	$ 3,129,744
Increase (decrease) in reinsurance business			468,749	217,169
Increase (decrease) in insurance business		(293,386)	(295,335)	(65,029)
Partially offset, related to development on A&E reserves			173,414
Reinsurance receivables		$ 1,348,226	1,018,325	894,037
Reinsurance receivable, percent		5.00%
Contracts of insurance and reinsurance received claims during the past three years, in years		20 years
Liabilites retroceded, percentage	100.00%
Maximum liability retroceded	$ 440,279
Total amount of liabilities retroceded	$ 300,000
Number of exposure groupings | item		200
Property and Short-Tail Business [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business		$ 238,378
Explosion, Port Of Tianjin, China [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Partially offset, related to development on A&E reserves			43,280
Explosion, Port Of Tianjin, China [Member] | Estimated [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business				60,000
Explosion, Port Of Tianjin, China [Member] | Projected [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business			16,720
Construction Liability, Umbrella, and Workers Compenstion Reserves [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business				$ 152,140
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		1,502,511	221,787
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 receivables		$ 356,556
Reinsurance receivable, percent		26.40%
Resolution Group Reinsurance (Barbados) Limited [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance receivables		$ 153,815
Reinsurance receivable, percent		11.40%
Zurich Vericherungs Gesellschaft [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance receivables		$ 113,922
Reinsurance receivable, percent		8.40%
C. V. Starr [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance receivables		$ 98,121
Reinsurance receivable, percent		7.30%
Munich Reinsurance Company [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance receivables		$ 82,234
Reinsurance receivable, percent		6.10%
A&E [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Partially offset, related to development on A&E reserves		$ 37,137	$ 53,909

Reserve For Losses, LAE And F70

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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves at beginning of period	$ 10,312,313	$ 9,951,798	$ 9,720,813
Less reinsurance recoverable	(1,212,649)	(990,862)	(881,503)	$ (655,095)
Net reserves at beginning of period	9,321,451	9,070,295	9,065,718
Incurred related to: Current year	4,815,967	3,434,964	3,129,744
Incurred related to: Prior years	(293,386)	(295,335)	(65,029)
Total incurred losses and LAE	4,522,581	3,139,629	3,064,715
Paid related to: Current year	1,280,605	745,642	690,030
Paid related to: Prior years	2,062,634	2,042,972	2,180,076
Total paid losses and LAE	3,343,239	2,788,614	2,870,106
Foreign exchange/translation adjustment	170,879	(99,859)	(190,032)
Net reserves at end of period	10,671,672	9,321,451	9,070,295
Plus reinsurance recoverable	1,212,649	990,862	881,503
Gross reserves at end of period	$ 11,884,321	$ 10,312,313	$ 9,951,798

Reserve For Losses, LAE And F71

Reserve For Losses, LAE And Future Policy Benefit Reserve (Ultimate Loss and ALAE And Paid Loss And ALAE, Net Of Reinsurance) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Liability for claims and claim adjustments expenses, net of reinsurance	$ 10,501,136
U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,102,152
Total of IBNR Liabilities Plus Expected Development on Reported Claims
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 945,365
Liability for claims and claim adjustments expenses, net of reinsurance	2,259,543
U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 4,363,986
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 60,784
Liability for claims and claim adjustments expenses, net of reinsurance	1,525,631
International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 1,005,474
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 145,624
Liability for claims and claim adjustments expenses, net of reinsurance	758,977
International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 3,199,151
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 103,727
Liability for claims and claim adjustments expenses, net of reinsurance	1,156,337
Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 1,794,825
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 478,609
Liability for claims and claim adjustments expenses, net of reinsurance	1,751,317
Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 1,163,145
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 41,326
Liability for claims and claim adjustments expenses, net of reinsurance	564,654
Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	2,868,985
All outstanding liabilities prior to 2012, net of reinsurance	492,565
Liability for claims and claim adjustments expenses, net of reinsurance	2,134,728
Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	$ 1,240,439
Cumulative Number of Reported Claims | item
All outstanding liabilities prior to 2012, net of reinsurance	$ 1,258
Liability for claims and claim adjustments expenses, net of reinsurance	349,948
2012 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	322,565	322,346	326,226	329,918	396,348	401,208
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 46,925
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 219,687	188,127	144,228	83,546	38,799	10,106
2012 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	606,657	610,276	610,631	623,648	725,098	938,601
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 16,054
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 565,001	548,146	530,630	494,159	403,010	242,627
2012 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	124,525	122,272	139,717	139,412	150,293	227,948
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 15,504
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 80,760	68,806	58,671	47,743	31,226	19,429
2012 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	480,506	479,764	479,524	476,043	528,305	573,735
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 1,408
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 455,715	444,579	430,935	406,317	336,226	206,138
2012 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	242,044	241,295	234,742	245,087	266,090	288,697
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 49,365
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 132,402	104,005	77,461	52,690	30,638	13,377
2012 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	165,817	165,056	164,846	169,173	184,894	242,489
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 737
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 156,471	153,521	146,835	119,980	87,774	46,925
2012 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	344,074	353,459	348,331	347,165	351,636	349,831
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 30,569
Cumulative Number of Reported Claims | item	15,956
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 272,165	246,496	213,520	157,947	101,311	33,202
2012 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	81,851	82,068	82,500	81,797	89,072	106,397
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 52
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 81,731	81,940	81,800	80,519	81,820	56,508
2013 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	373,749	389,284	386,448	388,852	311,205
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 93,170
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 212,063	171,491	109,285	49,254	14,966
2013 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	450,155	457,205	496,089	549,240	622,938
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 3,744
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 421,086	406,717	382,559	323,776	234,991
2013 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	148,265	150,865	170,467	172,834	188,025
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 28,514
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 79,808	70,853	57,067	42,905	18,472
2013 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	411,244	411,751	419,238	456,098	505,569
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 1,572
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 380,369	366,226	334,994	279,575	139,602
2013 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	255,034	265,366	256,555	262,083	231,658
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 85,969
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 104,610	78,677	53,401	34,814	17,517
2013 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	126,436	127,106	136,667	153,464	211,458
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 399
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 121,912	119,844	112,539	71,070	32,790
2013 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	351,451	393,209	393,066	393,629	393,819
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 43,549
Cumulative Number of Reported Claims | item	20,755
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 260,257	224,652	176,338	117,054	33,317
2013 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	92,381	92,292	91,407	98,290	112,122
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 509
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 91,868	92,259	91,989	93,241	68,726
2014 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	376,147	392,897	384,036	367,685
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 135,094
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 164,958	110,545	54,460	18,903
2014 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	439,279	474,834	551,402	641,956
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 10,087
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 396,820	370,796	322,307	218,933
2014 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	173,512	174,864	192,814	199,941
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 48,051
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 77,474	65,505	46,921	26,813
2014 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	445,950	501,195	546,124	599,886
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 7,250
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 393,241	360,863	291,893	167,362
2014 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	261,968	265,623	247,916	214,950
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 125,790
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 69,033	43,779	25,538	13,929
2014 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	135,607	138,821	164,884	185,865
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 2,741
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 127,117	106,632	86,034	29,932
2014 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	461,061	455,004	457,475	431,503
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 132,391
Cumulative Number of Reported Claims | item	25,009
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 256,954	201,725	124,955	41,197
2014 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	119,576	120,044	123,811	131,817
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 1,064
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 118,323	118,327	116,135	81,875
2015 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	346,598	354,411	326,444
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 163,674
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 107,130	53,707	19,959
2015 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	489,437	544,879	679,721
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 43,074
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 389,975	328,079	226,696
2015 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	179,038	183,842	197,518
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 65,441
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 72,943	50,706	25,231
2015 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	442,460	442,366	572,741
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 21,359
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 341,937	270,540	149,495
2015 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	314,580	309,169	282,046
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 150,231
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 96,964	62,136	14,318
2015 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	149,996	162,783	196,374
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 12,333
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 114,061	75,459	34,305
2015 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	536,494	528,841	520,192
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 207,887
Cumulative Number of Reported Claims | item	26,472
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 219,105	134,787	44,322
2015 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	144,202	153,145	173,196
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ (1,388)
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 142,670	141,494	102,300
2016 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	345,872	330,385
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 221,582
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 58,329	18,941
2016 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	792,187	966,781
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 109,698
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 552,545	286,444
2016 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	185,209	187,347
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 99,564
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 53,345	27,391
2016 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	509,642	538,515
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 72,123
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 294,628	159,858
2016 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	358,834	300,633
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 210,524
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 87,950	48,492
2016 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	180,278	211,265
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 52,012
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 79,795	27,748
2016 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	556,966	554,546
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 276,184
Cumulative Number of Reported Claims | item	30,384
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 164,415	54,747
2016 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	276,110	303,241
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ (612)
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 250,221	162,930
2017 [Member] | U.S. Reinsurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	337,220
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 272,301
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 25,807
2017 [Member] | U.S. Reinsurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	1,586,271
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 546,690
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 573,713
2017 [Member] | International [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	194,925
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 143,028
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 27,791
2017 [Member] | International [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	909,349
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 322,168
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 280,649
2017 [Member] | Bermuda [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	362,365
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 286,954
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 31,158
2017 [Member] | Bermuda [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	405,011
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 254,550
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 40,462
2017 [Member] | Insurance [Member] | Casualty [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	618,939
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 474,699
Cumulative Number of Reported Claims | item	26,419
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 53,926
2017 [Member] | Insurance [Member] | Property Business [Member]
Incurred Claims and Allocated Claim Adjustment Expenses, Net of reinsurance	526,318
Total of IBNR Liabilities Plus Expected Development on Reported Claims	$ 186,608
Cumulative Number of Reported Claims | item
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance	$ 206,938

Reserve For Losses, LAE And F72

Reserve For Losses, LAE And Future Policy Benefit Reserve (Average Annual Percentage Payout Incurred Claims By Age, Net Of Reinsurance) (Details)	12 Months Ended
	Dec. 31, 2017
Casualty [Member] | U.S. Reinsurance [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	5.20%
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	15.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	16.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	12.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	9.80%
Casualty [Member] | International [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	14.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	13.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	11.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	8.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	7.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	9.60%
Casualty [Member] | Bermuda [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	7.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	9.30%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	8.70%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	9.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	10.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	11.70%
Casualty [Member] | Insurance [Member]
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	19.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	16.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	13.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	9.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	7.50%
Property Business [Member] | U.S. Reinsurance [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	40.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	27.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	13.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	5.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	2.80%
Property Business [Member] | International [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	34.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	28.40%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	14.90%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	6.60%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	3.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	2.30%
Property Business [Member] | Bermuda [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	18.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	30.10%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	23.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	12.80%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	3.00%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	1.80%
Property Business [Member] | Insurance [Member]
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year One	63.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Two	29.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Three	0.20%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Four	0.50%
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Five	(0.10%)
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance, Year Six	(0.30%)

Reserve For Losses, LAE And F73

Reserve For Losses, LAE And Future Policy Benefit Reserve (Reconciliation of the Net Incurred and Paid Claims Development) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 10,501,136
Total reinsurance recoverable on unpaid claims	1,212,649
Insurance lines other than short-duration
Unallocated claims adjustment expenses	136,611
Other	33,925
Total other rxpenses	170,536
Total gross liability for unpaid claims and claim adjustment expense	11,884,321	$ 10,312,313	$ 9,951,798	$ 9,720,813
U.S. Reinsurance [Member] | Casualty [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,259,543
Total reinsurance recoverable on unpaid claims	110,852
U.S. Reinsurance [Member] | Property Business [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	1,525,631
Total reinsurance recoverable on unpaid claims	192,205
International [Member] | Casualty [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	758,977
Total reinsurance recoverable on unpaid claims	92,937
International [Member] | Property Business [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	1,156,337
Total reinsurance recoverable on unpaid claims	116,737
Bermuda [Member] | Casualty [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	1,751,317
Total reinsurance recoverable on unpaid claims	2,975
Bermuda [Member] | Property Business [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	564,654
Total reinsurance recoverable on unpaid claims	144,242
Insurance [Member] | Casualty [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,134,728
Total reinsurance recoverable on unpaid claims	492,606
Insurance [Member] | Property Business [Member]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	349,948
Total reinsurance recoverable on unpaid claims	$ 60,095

Reserve For Losses, LAE And F74

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Incurred Losses With Respect To A&E Reserves On Both Gross And Net Of Reinsurance Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross basis: Beginning of period reserves	$ 441,111	$ 433,117	$ 476,205
Gross basis: Incurred losses	90,009	73,336	40,000
Gross basis: Paid losses	(82,126)	(65,342)	(83,088)
Gross basis: End of period reserves	448,994	441,111	433,117
Net basis: Beginning of period reserves	319,072	319,620	458,211
Net basis: Incurred losses	37,137	53,909	38,440
Net basis: Paid losses	(38,128)	(54,457)	(177,031)
Net basis: End of period reserves	$ 318,081	$ 319,072	$ 319,620

Reserve For Losses, LAE And F75

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Balance at beginning of year	$ 55,074	$ 58,910	$ 59,820
Liabilities assumed	115	175	315
Adjustments to reserves	(437)	303	2,310
Benefits paid in the current year	(3,738)	(4,315)	(3,535)
Balance at end of year	$ 51,014	$ 55,074	$ 58,910

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)security	Dec. 31, 2017GBP (£)securityitem	Dec. 31, 2017USD ($)securityitem	Dec. 31, 2015USD ($)	Dec. 31, 2005security	Dec. 31, 2001security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio		$ 256,041,000		$ 386,241,000
Number of equity index put option contracts | security						7	7
Derivatives, Number Of Indices | item	2
Equity index put option liability		22,059,000		12,477,000
other invested assets		263,459,000		382,283,000	$ 321,818,000
Transfers between level 1 and 2				$ 0
Transfers from level 3	$ (788,000)	$ (1,903,000)
Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security		42
Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security			66	66
Available-for-sale Securities		$ 86,536,000
Standard & Poor's 500 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security			5	5
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	2.00%
Discount factor	3.00%
Present value of theoretical maximum payouts				400,534,000
Settlement amount if contracts had expired				0
Equity Index				$ 2,673.61
FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security			1	1
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	11.00%
Discount factor	3.00%
Present value of theoretical maximum payouts				41,212,000
Settlement amount if contracts had expired				0
Equity Index | £			£ 7,687.77
Parent Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
other invested assets		60,603,000		49,829,000
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of equity put options		22,059,000		12,477,000
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
other invested assets		$ 18,801,000		$ 79,505,000
Fair Value [Member] | Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security			65	65
Available-for-sale Securities				$ 165,173,000
Par Value [Member] | Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | item			1	1
Available-for-sale Securities				$ 51,965,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 14,756,834	$ 14,107,408
Equity securities, market value	129,530	119,067
Equity securities, fair value	963,572	1,010,085
Equity index put option contracts	12,477	22,059
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, market value	113,506	105,507
Equity securities, fair value	941,739	949,523
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	14,539,696	14,039,673
Equity securities, market value	16,024	13,560
Equity securities, fair value	21,833	60,562
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	217,138	67,735
Equity index put option contracts	12,477	22,059
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, market value	1,536,692	1,130,315
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, market value	1,536,692	1,130,315
Obligations Of U.S. States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	585,469	729,984
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, market value	585,469	729,984
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	5,699,005	5,155,281
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	5,488,819	5,090,084
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	210,186	65,197
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	531,360	488,648
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	531,360	488,648
Commercial Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	234,041	306,932
Commercial Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	234,041	306,932
Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,210,902	2,405,469
Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,210,902	2,405,469
Non-Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	494	641
Non-Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	494	641
Foreign Government Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,314,027	1,258,160
Foreign Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,314,027	1,258,160
Foreign Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,644,844	2,631,978
Foreign Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,637,892	2,629,440
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 6,952	$ 2,538

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	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 67,735	$ 5,526
Total gains or (losses) (realized/unrealized) Included in earnings	2,011	(1,093)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(946)	57
Purchases, issuances and settlements	149,126	65,148
Transfers in and/or (out) of Level 3	(788)	(1,903)
Ending balance	217,138	67,735
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
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	65,197	3,933
Total gains or (losses) (realized/unrealized) Included in earnings	1,655	100
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(992)	41
Purchases, issuances and settlements	144,326	63,054
Transfers in and/or (out) of Level 3		(1,931)
Ending balance	210,186	65,197
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
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)		16
Purchases, issuances and settlements		(44)
Transfers in and/or (out) of Level 3		28
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
Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	2,538	1,593
Total gains or (losses) (realized/unrealized) Included in earnings	356	(1,193)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	46
Purchases, issuances and settlements	4,800	2,138
Transfers in and/or (out) of Level 3	(788)
Ending balance	6,952	2,538
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 (Fair Value Measur79

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value [Abstract]
Balance, beginning of period	$ 22,059	$ 40,705
Total (gains) or losses (realized/unrealized) Included in earnings	(9,581)	(18,647)
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements
Transfers in and/or (out) of Level 3
Balance, end of period	12,477	22,059
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) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017GBP (£)item	Dec. 31, 2016GBP (£)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Nov. 09, 2015GBP (£)	Jun. 22, 2012USD ($)	Jul. 27, 2007USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | item	2
Line of credit facility, commitment			$ 1,050,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	5 years
Line of credit facility, commitment			$ 800,000	$ 800,000		$ 800,000
Line of credit facility, required minimum debt-to-capital ratio	0.35		0.35
Line of credit facility, required minimum net worth			$ 5,370,979
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			5,867,715
Wells Fargo Bank Group Credit Facility [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 [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 [Member] | Interest Rate Base Rate Option 1 [Member]
Line of Credit Facility [Line Items]
Debt Instrument Description Of Variable Rate Basis	an adjusted London Interbank Offered Rate ("LIBOR") plus a margin.
Wells Fargo Bank Group Credit Facility [Member] | Interest Rate Base Rate Option 1(a) [Member]
Line of Credit Facility [Line Items]
Debt Instrument Description Of Variable Rate Basis	prime commercial lending rate established by Wells Fargo Bank
Wells Fargo Bank Group Credit Facility [Member] | Interest Rate Base Rate Option 1(b) [Member]
Line of Credit Facility [Line Items]
Debt Instrument Description Of Variable Rate Basis	Federal Funds Rate plus 0.5
Wells Fargo Bank Group Credit Facility [Member] | Interest Rate Base Rate Option 1(c) [Member]
Line of Credit Facility [Line Items]
Debt Instrument Description Of Variable Rate Basis	one month LIBOR Rate plus 1.0
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	4 years
Line of credit facility, commitment			200,000	200,000			$ 800,000
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment			600,000
Citibank Holdings Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	3 years
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment			$ 250,000	$ 200,000
Per annum commitment fee on undrawn credit	0.15%
Citibank Bilateral Agreement [Member] | Interest Rate Base Rate Option 1(a) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	15 months
Debt Instrument Description Of Variable Rate Basis	% per annum of the principal amount of issued standard letters of credit (expiry of 15 months or less)
Percentage of interest on the principal amount of letters of credit issued	0.35%
Citibank Bilateral Agreement [Member] | Interest Rate Base Rate Option 1(b) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	60 months
Debt Instrument Description Of Variable Rate Basis	% per annum of the principal amount of issued extended tenor letters of credit (expiry maximum of up to 60 months).
Percentage of interest on the principal amount of issued extended tenor letters of credit	0.45%
Everest International Credit Facility [Member]
Line of Credit Facility [Line Items]
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
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%
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 | £	£ 145,000	£ 140,000			£ 145,000
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, 2017	Dec. 31, 2016	Dec. 31, 2015
Credit Facilities [Abstract]
Credit facility interest and fees incurred	$ 420	$ 793	$ 756

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017GBP (£)	Dec. 31, 2016GBP (£)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Nov. 09, 2015GBP (£)	Jun. 22, 2012USD ($)	Jul. 27, 2007USD ($)
Line of Credit Facility [Line Items]
Commitment			$ 1,050,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000	$ 200,000			$ 800,000
Wells Fargo Bank Group Credit Facility Tranche Two Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment			600,000	600,000
In Use			538,214	478,233
Date of Expiry	Dec. 31, 2018	Dec. 31, 2017
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000	800,000		$ 800,000
In Use			538,214	478,233
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			250,000	200,000
In Use			3,297	4,058
Date of Expiry	Feb. 28, 2018	Feb. 28, 2017
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			3,672	3,672
Date of Expiry	Nov. 24, 2018	Nov. 24, 2017
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			73,626	69,404
Date of Expiry	Dec. 31, 2018	Dec. 31, 2017
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			344	269
Date of Expiry	Aug. 30, 2019	Aug. 30, 2018
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			93,855	1,163
Date of Expiry	Dec. 30, 2021	Dec. 31, 2018
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use				93,180
Date of Expiry		Dec. 30, 2020
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			250,000	200,000
In Use			$ 174,794	$ 171,746
Lloyds Bank PLC [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 145,000	£ 140,000
In Use | £		£ 130,606
Date of Expiry		Dec. 31, 2019
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 145,000	£ 140,000			£ 145,000
In Use | £		£ 130,606

Senior Notes (Narrative) (Detai

Senior Notes (Narrative) (Details) - Senior Notes [Member] - 4.868% Senior notes due 6/1/2044 [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Date Issued	Jun. 5, 2014
Principal amounts	$ 400,000,000
Debt Instrument, Term	30 years
Debt instrument, stated interest rate	4.868%	4.868%
Maturity Date	Jun. 1, 2044

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 396,834,000	$ 396,714,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%	4.868%
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044
Principal amounts	$ 400,000,000
Consolidated balance sheet amount	396,834,000	$ 396,714,000
Market value	$ 420,340,000	$ 383,612,000

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, 2017	Dec. 31, 2016	Dec. 31, 2015
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	Mar. 19, 2009	Dec. 31, 2017	Dec. 31, 2016
6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate		6.60%	6.60%
Maturity Date		May 1, 2067
Reset quarterly interest rate		3.80%
Percentage of principal amount required for redemption		100.00%
Outstanding debt reduction	$ 161,441
Fixed Rate Interest Period [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate		6.60%
Interest basis, 3 month LIBOR plus number of basis points, reset quarterly		2.385%
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate		4.868%	4.868%
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 ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 236,561,000	$ 236,462,000
6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%	6.60%
Date Issued	Apr. 26, 2007
Original Principal Amount	$ 400,000,000
Maturity Date	May 1, 2067
Consolidated balance sheet amount	$ 236,561,000	$ 236,462,000
Market value	233,072,000	204,636,000
Parent Company [Member]
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 250,000,000	$ 250,000,000
Scheduled [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037
Final [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 1, 2067

Long Term Subordinated Notes 88

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Long Term Subordinated Notes [Abstract]
Interest expense incurred	$ 11,498	$ 15,749	$ 15,749

Collateralized Reinsurance An89

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands	Apr. 13, 2017USD ($)item	Dec. 01, 2015USD ($)item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts					$ 822,409
Percentage of voting common shares owned by Group					100.00%
Assumed net risk exposures					$ 837,202	$ 932,243
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued or outstanding
Reinsurance coverage amount					929,261	762,969	$ 709,402
Redeemable Preferred Stock [Member]
Effects of Reinsurance [Line Items]
Assumed net risk exposures					$ 50,373	$ 58,955
Kilimanjaro Re Limited [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	6	2			2
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			$ 500,000
Catastrophe reinsurance bonds funded amount		$ 625,000	$ 500,000	$ 450,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 Through 3 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	3
Reinsurance Contrants	4 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 Contrants	5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 225,000	300,000		250,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	400,000	$ 325,000		$ 200,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	325,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	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 2017-01 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	950,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-02 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	$ 300,000

Collateralized Reinsurance An90

Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 929,261	$ 762,969	$ 709,402
Assumed written premiums	5,090,367	4,214,286	4,321,922
Mt. Logan Re Segregated Accounts [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums	228,514	197,537	234,001
Ceded earned premiums	226,505	191,568	226,385
Ceded losses and LAE	323,664	44,802	40,807
Assumed written premiums	11,984	14,563	15,421
Assumed earned premiums	$ 11,984	$ 14,563	$ 15,421

Operating Lease Agreements (Nar

Operating Lease Agreements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Rental expense	$ 19,490	$ 17,663	$ 15,986
Minimum [Member]
Operating Leased Assets [Line Items]
Lease expiration year	2,018
Maximum [Member]
Operating Leased Assets [Line Items]
Lease expiration year	2,032

Operating Lease Agreements (Fut

Operating Lease Agreements (Future Minimum Rental Commitments) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Operating Lease Agreements [Abstract]
2,018	$ 16,990
2,019	17,964
2,020	17,115
2,021	8,035
2,022	7,669
Thereafter	24,668
Net commitments	$ 92,440

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
U.S. tax rate		35.00%
Accrual withholding taxes percent		5.00%
Accrual Withholding Taxes		$ 0
IRS net refund		29,385
reserve for uncertain tax positions		0
Deferred Tax Assets, Valuation Allowance		9,560	$ 3,846
Foreign tax credits		15,914
Alternative minimum tax credits		363
Net operating loss carryforward		$ 9,645	6,341
Long-tail payment patterns period		24 years
ASU 2016-02 [Member]
Income Tax Contingency [Line Items]
Tax benefits related to restricted stock vestings and stock options exercises		$ 6,951	6,861
Tax benefits related to payment of dividends on restricted stock		$ 626	$ 597
2009 Through 2013 IRS Audit [Member]
Income Tax Contingency [Line Items]
IRS audit period		5 years
IRS net refund		$ 43,682
Interest on net refund		1,252
Minimum amount of net refund that needs to be reviewed and approved		5,000
Tax Cut and Jobs Act [Member]
Income Tax Contingency [Line Items]
U.S. tax rate	21.00%
income tax expense		$ 8,246

Income Taxes (Components Of The

Income Taxes (Components Of The Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
U.S.	$ (117,173)	$ 30,971	$ 90,486
Non-U.S.	2,849	4,228	14,811
Total current tax expense (benefit)	(114,324)	35,199	105,297
U.S.	49,763	70,995	28,724
Non-U.S.	777	(2,694)
Total deferred tax expense (benefit)	50,540	68,301	28,724
Total income tax expense (benefit)	$ (63,784)	$ 103,500	$ 134,021

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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Net investment income	$ 149,128	$ 136,973	$ 134,508	$ 122,289	$ 115,167	$ 122,657	$ 132,737	$ 102,524	$ 542,898	$ 473,085	$ 473,473
Net realized capital gains (losses)	$ 33,663	$ 41,535	$ 25,268	$ 52,728	$ 34,005	$ 380	$ 32,658	$ (74,259)	153,194	(7,216)	(184,147)
Net derivative gain (loss)									9,581	18,647	6,317
Corporate expenses									(25,923)	(27,231)	(23,254)
Interest, fee and bond issue cost amortization expense									(31,603)	(36,228)	(36,191)
Other income (expense)									(35,442)	(10,636)	88,280
INCOME (LOSS) BEFORE TAXES									405,184	1,099,844	1,111,890
Total income tax expense (benefit)									(63,784)	103,500	134,021
Parent Company [Member]
Income Taxes [Line Items]
Net investment income									1,344	879	3,895
Net realized capital gains (losses)									80	144	(3,057)
Interest, fee and bond issue cost amortization expense									(4,300)	(4,300)	(4,300)
Other income (expense)									(6,873)	5,022	7,809
INCOME (LOSS) BEFORE TAXES									468,968	996,344	977,869
Total income tax expense (benefit)
U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)									(516,167)	208,821	294,386
Net investment income									255,310	230,691	234,709
Net realized capital gains (losses)									148,099	(16,465)	(159,268)
Corporate expenses									(7,394)	(8,276)	(7,179)
Interest, fee and bond issue cost amortization expense									(31,183)	(35,435)	(35,434)
Other income (expense)									30,325	(5,536)	27,706
INCOME (LOSS) BEFORE TAXES									(121,010)	373,801	354,920
Expected tax provision at the applicable statutory rate(s)									(42,355)	130,830	124,221
Increase (decrease) in tax resulting from: Tax exempt income									(8,488)	(9,078)	(10,004)
Increase (decrease) in tax resulting from: Dividend received deduction									(4,639)	(4,913)	(5,364)
Increase (decrease) in tax resulting from: Proration									1,760	1,931	2,160
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends									10,861	10,861	13,608
Increase (decrease) in tax resulting from: Tax audit settlement									(11,516)	(18,644)
Increase (decrease) in tax resulting from: Creditable foreign premium tax									(7,515)	(6,134)	(7,492)
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC									(6,716)
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment									(8,986)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform									8,246
Increase (decrease) in taxes resulting from: Other									1,938	(2,887)	2,081
Total income tax expense (benefit)									(67,410)	101,966	119,210
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)									308,646	480,602	493,025
Net investment income									287,588	242,393	238,763
Net realized capital gains (losses)									5,095	9,249	(24,879)
Net derivative gain (loss)									9,581	18,647	6,317
Corporate expenses									(18,529)	(18,955)	(16,075)
Interest, fee and bond issue cost amortization expense									(420)	(793)	(756)
Other income (expense)									(65,767)	(5,101)	60,574
INCOME (LOSS) BEFORE TAXES									526,194	726,043	756,970
Expected tax provision at the applicable statutory rate(s)									6,843	2,387	14,848
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC									(235)
Increase (decrease) in taxes resulting from: Other									(2,982)	(853)	(37)
Total income tax expense (benefit)									$ 3,626	$ 1,534	$ 14,811

Income Taxes (Net Deferred Inco

Income Taxes (Net Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Loss reserve	$ 52,649	$ 104,547
Unearned premium reserve	55,034	37,573
Net unrealized losses on benefit plans	19,120	35,271
Unrealized foreign currency losses	1,550	27,410
Benefit plan liability	10,417	14,576
Net operating loss carryforward	9,645	6,341
Uncollectible reinsurance reserve	3,320	5,534
Investment impairments	1,144	3,093
Deferred expenses	1,759	2,884
Foreign tax credits	15,914
Alternative minimum tax credits	363
Other assets	10,494	14,843
Total deferred tax assets	181,409	252,071
Deferred acquisition costs	64,997	26,652
Net fair value income	58,983	78,740
Net unrealized investment gains	11,576	20,698
Gain on tender of debt	3,287	10,958
Partnership investments	2,149	11,912
Other liabilities	2,174	3,086
Total deferred tax liabilities	143,165	152,045
Net deferred tax assets	38,244	100,026
Less: Valuation allowance	(9,560)	(3,846)
Total net deferred tax assets	$ 28,684	$ 96,181

Reinsurance (Details)

Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reinsurance [Abstract]
Written premiums: Direct									$ 2,083,555	$ 1,819,588	$ 1,569,791
Written premiums: Assumed									5,090,367	4,214,286	4,321,922
Written premiums: Ceded									(929,261)	(762,969)	(709,402)
Net written premiums	$ 1,693,625	$ 1,798,089	$ 1,339,133	$ 1,413,814	$ 1,369,851	$ 1,564,644	$ 1,154,953	$ 1,181,457	6,244,661	5,270,905	5,182,311
Premiums earned: Direct									1,825,705	1,694,702	1,491,163
Premiums earned: Assumed									4,945,522	4,361,944	4,500,526
Premium earned: Ceded									(833,387)	(736,180)	(698,847)
Net premiums earned	$ 1,657,187	$ 1,598,875	$ 1,369,681	$ 1,312,097	$ 1,441,265	$ 1,371,474	$ 1,288,860	$ 1,218,867	5,937,840	5,320,466	5,292,842
Incurred losses and LAE: Direct									1,311,682	1,496,455	1,268,896
Incurred losses and LAE: Assumed									3,909,816	2,121,902	2,152,633
Incurred losses and LAE: Ceded									(698,917)	(478,728)	(356,814)
Net incurred losses and LAE									$ 4,522,581	$ 3,139,629	$ 3,064,715

Comprehensive Income (Loss) (Co

Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 56,989	$ 39,094	$ (316,650)
Total, Tax Effect	134	(24,103)	36,578
Total, Net of Tax	57,123	14,991	(280,072)
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(81,915)	65,645	(333,657)
Tax Effect	21,597	(13,961)	54,502
Net of Tax	(60,318)	51,684	(279,155)
Reclassification, Before Tax	(7,258)	23,232	131,211
Reclassification, Tax Effect	308	(8,114)	(37,523)
Reclassification, Net of Tax	(6,950)	15,118	93,688
Total, Net of Tax	(4,030)	5,945
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(5,618)	7,734	8,411
Tax Effect	1,588	(1,789)	(3,383)
Net of Tax	(4,030)	5,945	5,028
Total, Net of Tax	(67,268)	66,802
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	142,054	(53,802)	(140,918)
Tax Effect	(20,137)	(1,539)	29,388
Net of Tax	121,917	(55,341)	(111,530)
Total, Net of Tax	121,917	(55,341)
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	1,300	(11,520)	8,740
Tax Effect	(273)	4,032	(3,059)
Net of Tax	1,027	(7,488)	5,681
Reclassification, Before Tax	8,426	7,805	9,563
Reclassification, Tax Effect	(2,949)	(2,732)	(3,347)
Reclassification, Net of Tax	5,477	5,073	$ 6,216
Total, Net of Tax	$ 6,504	$ (2,415)

Comprehensive Income (Loss) (Re

Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)									$ 160,287	$ 24,379	$ (81,948)
Income tax expense (benefit)									(63,784)	103,500	134,021
Net income (loss)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	468,968	996,344	977,869
Parent Company [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)
Net income (loss)									468,968	996,344	977,869
URA(D) On Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses									(7,258)	23,232	131,211
Income tax expense (benefit)									308	(8,114)	(37,523)
Net income (loss)									(6,950)	15,118	93,688
URA(D) On Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)									(7,258)	23,232
Income tax expense (benefit)									308	(8,114)
Net income (loss)									(6,950)	15,118
Benefit Plan Net Gain (Loss)[Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)									(2,949)	(2,732)
Other underwriting expenses									8,426	7,805	9,563
Income tax expense (benefit)									(2,949)	(2,732)	(3,347)
Net income (loss)									$ 5,477	$ 5,073	$ 6,216

Comprehensive Income (Loss) 100

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 8,075,396	$ 7,608,585
Current period change	57,123	14,991	$ (280,072)
Balance, end of period	8,369,232	8,075,396	7,608,585
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	115,558	42,811
Current period change	(4,030)	5,945
Balance, end of period	49,969	115,558	42,811
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(67,268)	66,802
URA(D) On Securities OTTI [Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	5,709
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(266,818)	(211,477)
Current period change	121,917	(55,341)
Balance, end of period	(138,931)	(266,818)	(211,477)
Foreign Currency Adjustment [Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	5,970
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(65,504)	(63,089)
Current period change	6,504	(2,415)
Balance, end of period	(71,929)	(65,504)	(63,089)
Benefit Plan Net Gain (Loss)[Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(12,929)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(216,764)	(231,755)	48,317
Current period change	57,123	14,991	(280,072)
Balance, end of period	$ (160,891)	$ (216,764)	$ (231,755)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	6,899
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	$ 0
Weighted average discount rate used to determine net periodic benefit cost	4.16%	4.38%	4.00%
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	7.50%	7.50%	7.50%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation	3.62%	4.16%	4.38%
Private equity limited partnerships	$ 26,297	$ 24,183
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%
Vested contribution after three years, percentage	100.00%
Defined contribution plans vesting period, years	3 years
Defined contribution plan employer contribution percentage for branch offices, minimum	4.20%
Defined contribution plan employer contribution percentage for branch offices, maximum	59.40%
Company contributions	$ 10,534	$ 30,821	$ 5,949
Pre-Medicare Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate	7.50%
Healthcare inflation rate decreased	4.50%
Post-Medicare Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate	7.50%
Healthcare inflation rate decreased	4.50%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	76.00%
Fixed Maturities [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	12.00%
Limited Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	11.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets consist of shares in investment trusts, percentage	1.00%
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	70.00%
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage	30.00%
Other Benefits Plans [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	543
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year	$ (577)
Weighted average discount rate used to determine net periodic benefit cost	4.16%	4.38%	4.00%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation	3.62%	4.16%	4.38%
Benefit Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 10,000	$ 30,000
Healthcare inflation rate	7.30%
Benefit Obligations [Member] | Pre-Medicare Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate	7.30%
Benefit Obligations [Member] | Post-Medicare Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Healthcare inflation rate decreased	4.50%

Employee Benefit Plans (Summary

Employee Benefit Plans (Summary Of Contributions To Defined Benefit Pension Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefit Plans [Abstract]
Company contributions	$ 10,534	$ 30,821	$ 5,949

Employee Benefit Plans (Summ103

Employee Benefit Plans (Summary Of Pension Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefit Plans [Abstract]
Pension expense	$ 16,299	$ 17,188	$ 22,682

Employee Benefit Plans (Summ104

Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	$ 281,853	$ 254,022
Service cost	10,949	10,924	$ 12,511
Interest cost	10,034	9,485	10,759
Actuarial (gain)/loss	24,679	12,155
Curtailment	(6,209)
Benefits paid	(5,104)	(4,733)
Projected benefit obligation at end of year	316,202	281,853	254,022
Balance, beginning of period	171,506	135,087
Actual return on plan assets	33,331	10,331
Actual contributions during the year	10,534	30,821
Administrative expenses paid
Benefits paid	(5,104)	(4,733)
Balance, end of period	210,267	171,506	135,087
Funded status at end of year	(105,935)	(110,348)
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	32,071	31,687
Service cost	1,570	1,418	1,794
Interest cost	1,184	1,007	1,187
Amendments	(3,526)	(794)
Actuarial (gain)/loss	4,038	(668)
Benefits paid	619	579
Projected benefit obligation at end of year	34,717	32,071	31,687
Balance, beginning of period
Actual contributions during the year	619	579
Benefits paid	(619)	(579)
Balance, end of period
Funded status at end of year	$ (34,717)	$ (32,071)

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets (due beyond one year)
Other liabilities (due within one year)	(3,871)	(2,371)
Other liabilities (due beyond one year)	(102,065)	(107,977)
Net amount recognized in the consolidated balance sheets	(105,935)	(110,348)
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other liabilities (due within one year)	(655)	(614)
Other liabilities (due beyond one year)	(34,062)	(31,457)
Net amount recognized in the consolidated balance sheets	$ (34,717)	$ (32,071)

Employee Benefit Plans (Amou106

Employee Benefit Plans (Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated prior service credit (cost)
Accumulated income (loss)	(86,788)	(96,965)
Accumulated other comprehensive income (loss)	(86,788)	(96,965)	$ (91,920)
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated prior service credit (cost)	4,057	662
Accumulated income (loss)	(8,317)	(4,471)
Accumulated other comprehensive income (loss)	$ (4,260)	$ (3,809)	$ (5,139)

Employee Benefit Plans (Other C

Employee Benefit Plans (Other Changes In Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	$ (96,965)	$ (91,920)
Net gain (loss) arising during period	(4,398)	(12,982)
Actuarial loss (gain)	8,366	7,937
Curtailment loss recognized	6,209
Other comprehensive income (loss) at December 31, current year	(86,788)	(96,965)
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other comprehensive income (loss) at December 31, prior year	(3,809)	(5,139)
Net gain (loss) arising during period	(4,038)	668
Prior Service credit (cost) arising during period	3,526	794
Actuarial loss (gain)	192
Prior service cost	(131)	(132)
Other comprehensive income (loss) at December 31, current year	$ (4,260)	$ (3,809)

Employee Benefit Plans (Net Per

Employee Benefit Plans (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Amortization of unrecognized prior service cost	$ 0
Net periodic benefit cost	16,299	$ 17,188	$ 22,682
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10,949	10,924	12,511
Interest cost	10,034	9,485	10,759
Expected return on plan assets	(13,050)	(11,158)	(11,620)
Amortization of actuarial loss from earlier periods	8,366	7,937	9,243
Amortization of unrecognized prior service cost			21
Settlement			1,768
Net periodic benefit cost	16,299	17,188	22,682
Other comprehensive income (loss) attributable to change from prior year	(10,177)	5,045
Total recognized in net periodic benefit cost and other comprehensive income (loss)	6,122	22,233
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,570	1,418	1,794
Interest cost	1,184	1,007	1,187
Expected return on plan assets	192
Amortization of unrecognized prior service cost	(577)
Settlement	(131)	(132)	300
Net periodic benefit cost	2,814	2,293	$ 3,280
Other comprehensive income (loss) attributable to change from prior year	451	(1,330)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 3,265	$ 963

Employee Benefit Plans (Summ109

Employee Benefit Plans (Summary Of Accumulated Benefit Obligation) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 269,912	$ 232,843
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	245,430	211,720
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 24,482	$ 21,123

Employee Benefit Plans (Project

Employee Benefit Plans (Projected Benefit Obligations In Excess Of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 291,720	$ 254,320
Fair value of plan assets	210,267	171,506
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	24,482	27,534
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, 2017	Dec. 31, 2016
Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 245,430	$ 211,720
Fair value of plan assets	210,267	171,506
Non-Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	24,482	21,123
Fair value of plan assets

Employee Benefit Plans (Expecte

Employee Benefit Plans (Expected Benefit Payments) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 10,205
2,019	10,288
2,020	12,452
2,021	12,331
2,022	12,132
Next 5 years	74,239
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	655
2,019	765
2,020	877
2,021	975
2,022	1,156
Next 5 years	$ 7,965

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value Measurement Levels For Qualified Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	$ 1,031	$ 3,665
Total	$ 183,970	$ 147,323
Percent of fixed income funds in US securities	50.00%	50.00%
Percent of fixed income funds in international securities	50.00%	50.00%
Percent of equities mutual funds in US equities	90.00%	90.00%
Percent of equities mutual funds in international equities	10.00%	10.00%
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	$ 23,361	$ 21,445
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	159,578	122,213
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Short-term investments, which approximates fair value	1,031	3,665
Total	183,970	147,323
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	23,361	21,445
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value	159,578	122,213
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 [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Other Observable Inputs (Level 2) [Member] | Equities [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 [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds, fair value
Significant Unobservable Inputs (Level 3) [Member] | Equities [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, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits and Share-based Compensation [Abstract]
Incurred expenses	$ 7,167	$ 6,058	$ 5,468

Employee Benefit Plans (Incu115

Employee Benefit Plans (Incurred Expenses Related To Defined Contribution Plans For Non-U.S. Employees) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits and Share-based Compensation [Abstract]
Incurred expenses	$ 1,849	$ 1,560	$ 1,423

Employee Benefit Plans (Changes

Employee Benefit Plans (Changes In The Assumed Healthcare Cost Trend) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Employee Benefits and Share-based Compensation [Abstract]
Effect on total service and interest cost components, Percentage Point Increase	$ 614
Effect on total service and interest cost components, Percentage Point Decrease	(476)
Effect on accumulated post-retirement benefit obligation, Percentage Point Increase	7,313
Effect on accumulated post-retirement benefit obligation, Percentage Point Decrease	$ (5,674)

Employee Benefit Plans (Post-Re

Employee Benefit Plans (Post-Retirement Benefit Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Post-retirement benefit expenses	$ 2,814	$ 2,293	$ 3,280

Dividend Restrictions And St118

Dividend Restrictions And Statutory Financial Information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	25.00%
Dividend payment restrictions, period in months	12 months
Dividend payment restrictions, percentage of statutory surplus required	10.00%
Available for payment of dividends in 2016 without need for prior regulatory approval	$ 339,185
Target capital level, percent of the enhanced capital requirement	120.00%
Minimum percent of total adjusted capital	200.00%
Everest Re [Member]
Dividend Restrictions And Statutory Financial Information [Line Items]
Statutory capital and surplus	$ 3,391,852	$ 3,635,121
Statutory net income(loss)	391,419	523,547	$ 498,455
Regulatory targeted capital	759,762
Bermuda Re [Member]
Dividend Restrictions And Statutory Financial Information [Line Items]
Statutory capital and surplus	3,085,882	2,950,517
Statutory net income(loss)	$ 582,128	$ 666,155	$ 622,571

Dividend Restrictions And St119

Dividend Restrictions And Statutory Financial Information (Regulatory Targeted Capital And The Actual Statutory Capital) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Percent Of Total Adjusted Capital		200.00%
Everest Re [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory targeted capital	[1]	$ 2,076,892	$ 1,411,440
Actual capital	[1]	3,391,852	3,635,121
Bermuda Re [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory targeted capital	[2],[3]		2,025,717
Actual capital	[2],[3]	$ 3,085,882	$ 2,950,517
[1]	Regulatory targeted capital represents 200% of the RBC authorized control level calculation for the applicable year.
[2]	Regulatory targeted capital represents the target capital level from the applicable year's BSCR calculation.
[3]	The 2017 BSCR calculation is not yet due to be completed; however, the Company anticipates that Bermuda Re's December 31, 2017 actual capital will exceed the targeted capital level.

Commitments And Contingencie120

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 144,618	$ 146,507
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 34,444	$ 33,860

Share-Based Compensation Pla121

Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	Nov. 16, 2016	Sep. 08, 2016	May 18, 2016	Feb. 24, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					200,000,000	200,000,000
Vesting period, years					3 years
Share units					0	0	0
Share-based compensation expense					$ 30,297	$ 26,398	$ 21,237
Expiration period, in years					10 years
Income tax benefit recorded					$ 14,824	6,898	4,870
Additional paid-in capital due to tax benefit from dividends on restricted shares					626	597	446
Aggregate intrinsic value of options exercised					14,130	19,876	21,434
Cash received from the exercised share options					8,312
Tax benefit realized from the options exercised					4,743
Unrecognized compensation cost					56,981
Tax benefit from stock options vested					10,130
Fair value of shares vested					$ 23,134	19,037	17,464
Unrecognized compensation cost expected to be recognized over a weighted-average period, years					3 years 1 month 6 days
Aggregate value of issuances					$ 94	$ 103	$ 75
Employee Plans, 1995 And 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units					0
2010 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					4,000,000
Remaining shares					2,553,473
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
2003 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					500,000
Remaining shares					346,714
Percentage of options and restricted shares granted					33.00%
Vesting period, years					3 years
1995 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years					2 years
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					2,141,557
Restricted shares cancelled					280,452
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, issued					404	547	426
Restricted shares issued					145,817
Restricted shares cancelled					0
Common stock acquired					60,453	70,010	82,277
Common stock, value					$ 14,240	$ 12,111	$ 14,666
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted	$ 229.5425	$ 230.520	$ 242.225	$ 234.030
Share units	160,185	160,185	160,185	160,185	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 229.5425	$ 230.520	$ 242.225	$ 234.030
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units				11,245
Share-based compensation awards, exercise price				$ 234.030
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] | Growth In Book Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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]
Vesting period, years					3 years
Performance share unit valuation growth, percentage					50.00%
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					0

Share-Based Compensation Pla122

Share-Based Compensation Plans (Company's Shareholder Approved Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-Based Compensation Plans [Abstract]
Outstanding at January 1, Shares	454,994	648,034	888,184
Exercised, Shares	94,630	187,940	230,350
Forfeited/Cancelled/Expired, Shares		5,100	9,800
Outstanding at December 31, Shares	360,364	454,994	648,034
Exercisable at December 31, Shares	360,364	410,694	495,334
Outstanding at January 1, Weighted-Average Exercise Price/Share	$ 84.88	$ 85.61	$ 86.05
Exercised, Weighted- Average Exercise Price/Share	87.84	87.31	87.21
Forfeited/Cancelled/Expired, Weighted- Average Exercise Price/Share		88.25	87.68
Outstanding at December 31, Weighted-Average Exercise Price/Share	84.10	84.88	85.61
Exercisable at December 31, Weighted-Average Exercise Price/Share	$ 84.10	$ 84.50	$ 84.94
Outstanding at December 31, Weighted-Average Remaining Contractual Term	2 years 8 months 12 days	3 years 8 months 12 days	4 years 6 months
Exercisable at December 31, Weighted-Average Remaining Contractual Term	2 years 8 months 12 days	3 years 6 months	4 years 1 month 6 days
Outstanding at December 31, Aggregate Intrinsic Value	$ 49,428	$ 59,843	$ 64,352
Exercisable at December 31, Aggregate Intrinsic Value	$ 49,428	$ 54,169	$ 49,517

Share-Based Compensation Pla123

Share-Based Compensation Plans (Share Options Outstanding And Exercisable) (Details)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding | shares	360,364
Options Outstanding, Weighted Average-Remaining Contractual Life	2 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 84.10
Options Exercisable, Number Exercisable | shares	360,364
Options Exercisable, Weighted-Average Exercise Price	$ 84.10
$71.7150 - $78.1700 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	71.7150
Ranges of Exercise Prices, Upper range limit	$ 78.1700
Options Outstanding, Number Outstanding | shares	79,760
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 71.72
Options Exercisable, Number Exercisable | shares	79,760
Options Exercisable, Weighted-Average Exercise Price	$ 71.72
$78.1800 - $85.6300 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Ranges of Exercise Prices, Lower range limit	78.1800
Ranges of Exercise Prices, Upper range limit	$ 85.6300
Options Outstanding, Number Outstanding | shares	61,900
Options Outstanding, Weighted Average-Remaining Contractual Life	2 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 84.63
Options Exercisable, Number Exercisable | shares	61,900
Options Exercisable, Weighted-Average Exercise Price	$ 84.63
$85.6400 - $87.4700 [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 | shares	88,590
Options Outstanding, Weighted Average-Remaining Contractual Life	3 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 86.62
Options Exercisable, Number Exercisable | shares	88,590
Options Exercisable, Weighted-Average Exercise Price	$ 86.62
$87.4800 - $89.4100 [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 | shares	110,060
Options Outstanding, Weighted Average-Remaining Contractual Life	4 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 88.32
Options Exercisable, Number Exercisable | shares	110,060
Options Exercisable, Weighted-Average Exercise Price	$ 88.32
$89.4200 - $110.1300 [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 | shares	20,054
Options Outstanding, Weighted Average-Remaining Contractual Life	1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price	$ 97.41
Options Exercisable, Number Exercisable | shares	20,054
Options Exercisable, Weighted-Average Exercise Price	$ 97.41

Share-Based Compensation Pla124

Share-Based Compensation Plans (Summary Of Company's Non-Vested Shares And Changes) (Details) - Restricted Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares	435,338	435,336	467,745
Granted - Shares	160,185	173,546	156,262
Vested, Shares	152,397	145,834	154,387
Forfeited, Shares	21,865	27,710	34,284
Outstanding at December 31, Shares	421,261	435,338	435,336
Outstanding at January 1, Weighted Average Grant Date Fair Value	$ 164.21	$ 143.02	$ 120.84
Granted, Weighted Average Grant Date Fair Value	234.01	186.37	178.80
Vested, Weighted Average Grant Date Fair Value	151.80	130.54	113.12
Forfeited, Weighted Average Grant Date Fair Value	187.82	147.32	138.19
Outstanding at December 31, Weighted Average Grant Date Fair Value	$ 194.01	$ 164.21	$ 143.02

Share-Based Compensation Pla125

Share-Based Compensation Plans (Company's Non-Vested Performance Share Unit Awards) (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares	21,835	10,705
Granted - Shares	11,245	11,130	10,705
Vested, Shares
Forfeited, Shares
Outstanding at December 31, Shares	33,080	21,835	10,705
Outstanding at January 1, Weighted Average Grant Date Fair Value	$ 182.50	$ 178.84
Granted, Weighted Average Grant Date Fair Value	234.03	186.02	178.84
Vested, Weighted Average Grant Date Fair Value
Forfeited, Weighted Average Grant Date Fair Value
Outstanding at December 31, Weighted Average Grant Date Fair Value	$ 200.02	$ 182.50	$ 178.84

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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross written premiums									$ 2,083,555	$ 1,819,588	$ 1,569,791
Net written premiums	$ 1,693,625	$ 1,798,089	$ 1,339,133	$ 1,413,814	$ 1,369,851	$ 1,564,644	$ 1,154,953	$ 1,181,457	6,244,661	5,270,905	5,182,311
Premiums earned	$ 1,657,187	$ 1,598,875	$ 1,369,681	$ 1,312,097	$ 1,441,265	$ 1,371,474	$ 1,288,860	$ 1,218,867	5,937,840	5,320,466	5,292,842
Incurred losses and LAE									4,522,581	3,139,629	3,064,715
Commission and brokerage									1,303,963	1,188,692	1,183,646
Other underwriting expenses									318,817	302,722	257,069
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums									2,592,972	2,125,792	2,147,892
Net written premiums									2,245,422	1,970,575	1,855,853
Premiums earned									2,181,160	2,072,155	1,952,680
Incurred losses and LAE									1,632,795	1,068,475	825,081
Commission and brokerage									462,487	465,953	493,261
Other underwriting expenses									55,881	54,107	50,087
Underwriting gain (loss)									29,997	483,620	584,251
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums									1,316,701	1,230,683	1,334,206
Net written premiums									1,229,597	1,082,712	1,208,978
Premiums earned									1,202,043	1,119,121	1,251,111
Incurred losses and LAE									1,059,640	486,550	749,891
Commission and brokerage									287,688	283,447	298,180
Other underwriting expenses									38,844	35,512	34,303
Underwriting gain (loss)									(184,129)	313,612	168,737
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums									1,205,001	890,375	877,328
Net written premiums									1,139,082	831,931	791,594
Premiums earned									1,093,250	837,964	822,391
Incurred losses and LAE									735,292	461,909	456,448
Commission and brokerage									303,707	233,989	215,992
Other underwriting expenses									38,011	36,331	36,017
Underwriting gain (loss)									16,240	105,735	113,934
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums									2,059,248	1,787,024	1,532,287
Net written premiums									1,630,560	1,385,687	1,325,886
Premiums earned									1,461,387	1,291,226	1,266,660
Incurred losses and LAE									1,094,854	1,122,695	1,033,295
Commission and brokerage									250,081	205,303	176,213
Other underwriting expenses									186,081	176,772	136,661
Underwriting gain (loss)									$ (69,629)	$ (213,544)	$ (79,509)

Segment Reporting (Schedule 127

Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net investment income	$ 149,128	$ 136,973	$ 134,508	$ 122,289	$ 115,167	$ 122,657	$ 132,737	$ 102,524	$ 542,898	$ 473,085	$ 473,473
Net realized capital gains (losses)	$ 33,663	$ 41,535	$ 25,268	$ 52,728	$ 34,005	$ 380	$ 32,658	$ (74,259)	153,194	(7,216)	(184,147)
Net derivative gain (loss)									9,581	18,647	6,317
Corporate expenses									(25,923)	(27,231)	(23,254)
Interest, fee and bond issue cost amortization expense									(31,603)	(36,228)	(36,191)
Other income (expense)									(35,442)	(10,636)	88,280
INCOME (LOSS) BEFORE TAXES									405,184	1,099,844	1,111,890
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)									(207,521)	689,423	787,412
Net investment income									542,898	473,085	473,473
Net realized capital gains (losses)									153,194	(7,216)	(184,147)
Net derivative gain (loss)									9,581	18,647	6,317
Corporate expenses									(25,923)	(27,231)	(23,254)
Interest, fee and bond issue cost amortization expense									(31,603)	(36,228)	(36,191)
Other income (expense)									(35,442)	(10,636)	88,280
INCOME (LOSS) BEFORE TAXES									$ 405,184	$ 1,099,844	$ 1,111,890

Segment Reporting (Schedule 128

Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross written premiums	$ 2,083,555	$ 1,819,588	$ 1,569,791
Percentage Threshold Of Company Revenue Not Exceeded By Any Other Country	20.40%	19.40%	20.70%
United Kingdom Gross Written Premium [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 730,826	$ 688,598	$ 740,763

Dispositions (Narrative) (Detai

Dispositions (Narrative) (Details) - USD ($)	Aug. 24, 2016	Jul. 13, 2015
Liabilites retroceded, percentage		100.00%
Cash consideration		$ 140,279,000
Maximum liability retroceded		440,279,000
Total amount of liabilities retroceded		300,000,000
Heartland Crop [Member]
Proceeds from sale of business	$ 49,000,000
After-tax loss on sale	$ 12,942,000
Mt. Mckinley [Member]
Proceeds from sale of business		$ 20,156,000
Liabilites retroceded, percentage		100.00%
Cash consideration		$ 140,279,000
Maximum liability retroceded		440,279,000
Total amount of liabilities retroceded		300,000,000
A&E [Member]
Cash consideration		$ 100,451,000

Unaudited Quarterly Financia130

Unaudited Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unaudited Quarterly Financial Data [Abstract]
Gross written premiums	$ 1,926,427	$ 2,044,902	$ 1,601,649	$ 1,600,944	$ 1,534,719	$ 1,782,616	$ 1,363,351	$ 1,353,189
Net written premiums	1,693,625	1,798,089	1,339,133	1,413,814	1,369,851	1,564,644	1,154,953	1,181,457	$ 6,244,661	$ 5,270,905	$ 5,182,311
Premiums earned	1,657,187	1,598,875	1,369,681	1,312,097	1,441,265	1,371,474	1,288,860	1,218,867	5,937,840	5,320,466	5,292,842
Net investment income	149,128	136,973	134,508	122,289	115,167	122,657	132,737	102,524	542,898	473,085	473,473
Net realized capital gains (losses)	33,663	41,535	25,268	52,728	34,005	380	32,658	(74,259)	153,194	(7,216)	(184,147)
Total claims and underwriting expenses	1,159,977	2,616,340	1,240,100	1,128,944	1,183,507	1,174,276	1,225,395	1,047,865	6,202,887	4,694,502	4,564,875
NET INCOME (LOSS)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	$ 468,968	$ 996,344	$ 977,869
Basic	$ 13.92	$ (15.73)	$ 5.98	$ 7.12	$ 9.14	$ 7.11	$ 3.70	$ 4.03	$ 11.43	$ 23.85	$ 22.29
Diluted	$ 13.85	$ (15.73)	$ 5.95	$ 7.07	$ 9.08	$ 7.06	$ 3.67	$ 4	$ 11.36	$ 23.68	$ 22.10

Schedule I - Summary Of Inve131

Schedule I - Summary Of Investments - Other Than Investments In Related Parties (Details) $ in Thousands	Dec. 31, 2017USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	$ 18,276,088
Total investments and cash, Market Value	18,626,535
Total investments and cash, Amount Shown in Balance Sheet	18,626,535
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	14,689,598
Total investments and cash, Market Value	14,756,834
Total investments and cash, Amount Shown in Balance Sheet	14,756,834
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	1,540,952
Total investments and cash, Market Value	1,536,692
Total investments and cash, Amount Shown in Balance Sheet	1,536,692
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	563,790
Total investments and cash, Market Value	585,469
Total investments and cash, Amount Shown in Balance Sheet	585,469
Foreign Government Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	1,305,070
Total investments and cash, Market Value	1,314,027
Total investments and cash, Amount Shown in Balance Sheet	1,314,027
Foreign Corporate Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	2,616,205
Total investments and cash, Market Value	2,644,844
Total investments and cash, Amount Shown in Balance Sheet	2,644,844
Public Utilities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	313,001
Total investments and cash, Market Value	315,344
Total investments and cash, Amount Shown in Balance Sheet	315,344
All Other Corporate Bonds [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	5,875,896
Total investments and cash, Market Value	5,912,998
Total investments and cash, Amount Shown in Balance Sheet	5,912,998
Commercial Mortgage-Backed Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	235,794
Total investments and cash, Market Value	234,041
Total investments and cash, Amount Shown in Balance Sheet	234,041
Agency Residential [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	2,236,361
Total investments and cash, Market Value	2,210,902
Total investments and cash, Amount Shown in Balance Sheet	2,210,902
Non-Agency Residential [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	497
Total investments and cash, Market Value	494
Total investments and cash, Amount Shown in Balance Sheet	494
Redeemable Preferred Stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	2,032
Total investments and cash, Market Value	2,023
Total investments and cash, Amount Shown in Balance Sheet	2,023
Equity Securities - Available For Sale At Market Value [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	130,287
Total investments and cash, Market Value	129,530
Total investments and cash, Amount Shown in Balance Sheet	129,530
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	682,701	[1]
Total investments and cash, Market Value	963,572	[1]
Total investments and cash, Amount Shown in Balance Sheet	963,572	[1]
Short-Term Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	509,682
Total investments and cash, Market Value	509,682
Total investments and cash, Amount Shown in Balance Sheet	509,682
Other Invested Assets [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	1,628,753
Total investments and cash, Market Value	1,631,850
Total investments and cash, Amount Shown in Balance Sheet	1,631,850
Cash [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total investments and cash, Cost	635,067
Total investments and cash, Market Value	635,067
Total investments and cash, Amount Shown in Balance Sheet	$ 635,067
[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 Fina132

Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Other assets	$ 382,283,000	$ 263,459,000	$ 321,818,000
Other income (expense)	(35,442,000)	(10,636,000)	88,280,000
Parent Company [Member]
Debt Instrument [Line Items]
Other assets	49,829,000	60,603,000
Other income (expense)	$ (6,873,000)	5,022,000	7,809,000
Parent Company [Member] | Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 250,000,000
Maturity Date	Dec. 31, 2023
Debt instrument, stated interest rate	1.72%
Mt. Logan Re Segregated Accounts [Member] | Parent Company [Member]
Debt Instrument [Line Items]
Other assets	$ 50,373,000	58,955,000
Other income (expense)	$ (6,352,000)	$ 5,536,000	$ 8,268,000

Schedule II - Condensed Fina133

Schedule II - Condensed Financial Information Of The Registrant (Condensed Balance Sheets) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Fixed maturities, market value	$ 14,756,834	$ 14,107,408
Other invested assets	1,631,850	1,333,129
Cash	635,067	481,922
Accrued investment income	97,704	96,473
Other assets	382,283	263,459	$ 321,818
TOTAL ASSETS	23,591,792	21,321,504	20,550,828
Long term note payable - Affiliated	236,561	236,462
Accrued interest and debt borrowings	2,727	3,537
Other liabilities	332,620	331,877	261,322
Total liabilities	15,222,560	13,246,108	12,942,243
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued or outstanding
Common shares, par value: $0.01; 200,000 shares authorized; (2017) 69,044 and (2016) 68,871 issued before treasury shares	691	689
Additional paid-in capital	2,165,768	2,140,783
Accumulated other comprehensive income (loss), net of deferred income	(160,891)	(216,764)
Treasury shares, at cost;	(3,322,244)	(3,272,244)
Retained earnings	9,685,908	9,422,932
Total shareholders' equity	8,369,232	8,075,396	7,608,585
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	23,591,792	21,321,504	20,550,828
Fixed maturities - available for sale, at market value, amortized cost	14,689,598	13,932,613
Other invested assets, at cost	$ 1,628,753	$ 1,333,069
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 shares, authorized	200,000,000	200,000,000
Common shares, outstanding	69,044,000	68,871,000
Accumulated other comprehensive income (loss), deferred income tax expense (benefit)	$ (134)	$ 24,103	$ (36,578)
Treasury shares, at cost	28,208,000	27,972,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Fixed maturities, market value	$ 100,697	$ 2,178
Other invested assets	102,559	145,036
Cash	3,275	2,034
Investment in subsidiaries, at equity in the underlying net assets	8,356,791	8,120,595
Accrued investment income	394	20
Receivable from subsidiaries	7,361	894
Other assets	49,829	60,603
TOTAL ASSETS	8,620,906	8,331,360
Long term note payable - Affiliated	250,000	250,000
Due to subsidiaries	1,017	1,020
Other liabilities	657	4,944
Total liabilities	251,674	255,964
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued or outstanding	0	0
Common shares, par value: $0.01; 200,000 shares authorized; (2017) 69,044 and (2016) 68,871 issued before treasury shares	691	689
Additional paid-in capital	2,165,768	2,140,783
Accumulated other comprehensive income (loss), net of deferred income	(160,891)	(216,764)
Treasury shares, at cost;	(3,322,244)	(3,272,244)
Retained earnings	9,685,908	9,422,932
Total shareholders' equity	8,369,232	8,075,396
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	8,620,906	8,331,360
Fixed maturities - available for sale, at market value, amortized cost	100,703	2,176
Other invested assets, at cost	$ 102,559	$ 145,036
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 shares, authorized	200,000,000	200,000,000
Common shares, issued	69,044,000	68,871,000
Common shares, outstanding	69,044,000	68,871,000
Accumulated other comprehensive income (loss), deferred income tax expense (benefit)	$ 9,356	$ 8,204
Treasury shares, at cost	28,208,000	27,972,000

Schedule II - Condensed Fina134

Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net investment income	$ 149,128	$ 136,973	$ 134,508	$ 122,289	$ 115,167	$ 122,657	$ 132,737	$ 102,524	$ 542,898	$ 473,085	$ 473,473
Net realized capital gains (losses)	33,663	41,535	25,268	52,728	34,005	380	32,658	(74,259)	153,194	(7,216)	(184,147)
Other income (expense)									(35,442)	(10,636)	88,280
Total revenues									6,608,071	5,794,346	5,676,765
Interest expense - affiliated									31,603	36,228	36,191
Total expenses	1,159,977	2,616,340	1,240,100	1,128,944	1,183,507	1,174,276	1,225,395	1,047,865	6,202,887	4,694,502	4,564,875
INCOME (LOSS) BEFORE TAXES									405,184	1,099,844	1,111,890
Income tax expense (benefit)									(63,784)	103,500	134,021
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	468,968	996,344	977,869
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period									(64,348)	57,629	(274,127)
Reclassification adjustment for realized losses (gains) included in net income (loss)									6,950	(15,118)	(93,688)
Total URA(D) on securities arising during the period									(71,298)	72,747	(180,439)
Foreign currency translation adjustments									121,917	(55,341)	(111,530)
Benefit plan actuarial net gain (loss) for the period									1,027	(7,488)	5,681
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)									5,477	5,073	6,216
Total benefit plan net gain (loss) for the period									6,504	(2,415)	11,897
Total other comprehensive income (loss), net of tax									57,123	14,991	(280,072)
COMPREHENSIVE INCOME (LOSS)									526,091	1,011,335	697,797
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net investment income									1,344	879	3,895
Net realized capital gains (losses)									80	144	(3,057)
Other income (expense)									(6,873)	5,022	7,809
Net income (loss) of subsidiaries									495,496	1,012,315	989,462
Total revenues									490,048	1,018,360	998,109
Interest expense - affiliated									4,300	4,300	4,300
Other expenses									16,780	17,716	15,940
Total expenses									21,080	22,016	20,240
INCOME (LOSS) BEFORE TAXES									468,968	996,344	977,869
Income tax expense (benefit)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									468,968	996,344	977,869
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period									(64,348)	57,629	(274,127)
Reclassification adjustment for realized losses (gains) included in net income (loss)									6,950	(15,118)	(93,688)
Total URA(D) on securities arising during the period									(71,298)	72,747	(180,439)
Foreign currency translation adjustments									121,917	(55,341)	(111,530)
Benefit plan actuarial net gain (loss) for the period									1,027	(7,488)	5,681
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)									5,477	5,073	6,216
Total benefit plan net gain (loss) for the period									6,504	(2,415)	11,897
Total other comprehensive income (loss), net of tax									57,123	14,991	(280,072)
COMPREHENSIVE INCOME (LOSS)									$ 526,091	$ 1,011,335	$ 697,797

Schedule II - Condensed Fina135

Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
NET INCOME (LOSS)	$ 571,025	$ (639,374)	$ 245,674	$ 291,643	$ 373,572	$ 295,394	$ 155,692	$ 171,686	$ 468,968	$ 996,344	$ 977,869
Change in other assets and liabilities, net									(66,998)	(45,605)	2,671
Amortization of bond premium (accrual of bond discount)									45,867	49,167	50,901
Realized capital losses (gains)	(33,663)	$ (41,535)	$ (25,268)	(52,728)	(34,005)	$ (380)	$ (32,658)	74,259	(153,194)	7,216	184,147
Non-cash compensation expense									30,297	26,398	21,237
Net cash provided by (used in) operating activities									1,162,693	1,383,600	1,108,235
Proceeds from fixed maturities sold - available for sale, at market value									2,401,844	1,258,434	1,724,093
Distributions from other invested assets									5,579,043	4,823,484	57,201
Cost of fixed maturities acquired - available for sale, at market value									(5,131,098)	(4,061,896)	(4,718,303)
Cost of other invested assets acquired									(5,829,271)	(5,396,001)	(286,599)
Net change in short-term investments									(73,923)	368,977	341,733
Net cash provided by (used in) investing activities									(732,577)	(657,873)	(681,101)
Common shares issued during the period, net									(5,310)	10,751	13,597
Purchase of treasury shares									(50,000)	(386,288)	(400,059)
Dividends paid to shareholders									(207,242)	(195,384)	(175,107)
Net cash provided by (used in) financing activities									(275,458)	(581,516)	(573,170)
EFFECT OF EXCHANGE RATE CHANGES ON CASH									(1,513)	54,053	(7,780)
Net increase (decrease) in cash									153,145	198,264	(153,816)
Cash, beginning of period				481,922				283,658	481,922	283,658	437,474
Cash, end of period	635,067				481,922				635,067	481,922	283,658
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
NET INCOME (LOSS)									468,968	996,344	977,869
Equity in retained (earnings) deficit of subsidiaries									(495,496)	(1,012,315)	(989,462)
Change in other assets and liabilities, net									6,107	66	(7,626)
Increase (decrease) in due to/from affiliates									(6,470)	(206)	839
Amortization of bond premium (accrual of bond discount)									12	(56)	525
Realized capital losses (gains)									(80)	(144)	3,057
Non-cash compensation expense									3,448	2,311	1,841
Net cash provided by (used in) operating activities									401,489	676,000	577,043
Additional investment in subsidiaries									(109,815)	(77,324)	(60,600)
Proceeds from fixed maturities matured/called - available for sale, at market value									696	1,152	26,074
Proceeds from fixed maturities sold - available for sale, at market value									90,154	75,025	252,047
Distributions from other invested assets									546,414	757,399
Cost of fixed maturities acquired - available for sale, at market value									(189,308)		(532,480)
Cost of other invested assets acquired									(503,937)	(902,435)
Net change in short-term investments										18,288	279,462
Net cash provided by (used in) investing activities									(165,796)	(127,895)	(35,497)
Common shares issued during the period, net									22,790	34,861	32,962
Purchase of treasury shares									(50,000)	(386,288)	(400,059)
Dividends paid to shareholders									(207,242)	(195,384)	(175,107)
Net cash provided by (used in) financing activities									(234,452)	(546,811)	(542,204)
EFFECT OF EXCHANGE RATE CHANGES ON CASH
Net increase (decrease) in cash									1,241	1,294	(658)
Cash, beginning of period				$ 2,034				$ 740	2,034	740	1,398
Cash, end of period	$ 3,275				$ 2,034				3,275	2,034	740
Bermuda Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries									400,000	650,000	575,000
Everest International [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries										$ 40,000	$ 15,000
Mt. Logan Re [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiaries									$ 25,000

Schedule III - Supplementary136

Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	$ 411,587	$ 344,052	$ 372,351
Reverse for Losses and Loss Adjustment Expenses	11,884,321	10,312,313	9,951,798
Unearned Premium Reserves	2,000,556	1,577,546	1,613,390
Premiums Earned	5,937,840	5,320,466	5,292,842
Net Investment Income	542,898	473,085	473,473
Incurred Loss and Loss Adjustment Expenses	4,522,581	3,139,629	3,064,715
Amortization of Deferred Acquisition Costs	1,303,963	1,188,692	1,183,646
Other Operating Expenses	318,817	302,722	257,069
Net Written Premium	6,244,661	5,270,905	5,182,311
U.S. [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	289,636	220,864	234,061
Reverse for Losses and Loss Adjustment Expenses	7,254,043	6,604,867	6,114,129
Unearned Premium Reserves	1,460,291	1,110,528	1,083,493
Premiums Earned	3,642,547	3,363,381	3,219,340
Net Investment Income	259,621	234,123	245,159
Incurred Loss and Loss Adjustment Expenses	2,727,649	2,191,170	1,858,376
Amortization of Deferred Acquisition Costs	712,568	671,256	669,474
Other Operating Expenses	241,962	230,879	186,748
Net Written Premium	3,875,982	3,356,262	3,181,739
International [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	53,186	52,014	61,217
Reverse for Losses and Loss Adjustment Expenses	2,175,500	1,748,380	1,819,700
Unearned Premium Reserves	253,626	237,120	273,677
Premiums Earned	1,202,043	1,119,121	1,251,111
Net Investment Income	32,407	33,059	34,181
Incurred Loss and Loss Adjustment Expenses	1,059,640	486,550	749,891
Amortization of Deferred Acquisition Costs	287,688	283,447	298,180
Other Operating Expenses	38,844	35,512	34,303
Net Written Premium	1,229,597	1,082,712	1,208,978
Bermuda [Member]
Supplementary Insurance Information, by Segment [Line Items]
Deferred Acquisition Costs	68,765	71,174	77,074
Reverse for Losses and Loss Adjustment Expenses	2,454,778	1,959,065	2,017,970
Unearned Premium Reserves	286,639	229,898	256,220
Premiums Earned	1,093,250	837,964	822,391
Net Investment Income	250,870	205,902	194,133
Incurred Loss and Loss Adjustment Expenses	735,292	461,909	456,448
Amortization of Deferred Acquisition Costs	303,707	233,989	215,992
Other Operating Expenses	38,011	36,331	36,017
Net Written Premium	$ 1,139,082	$ 831,931	$ 791,594

Schedule IV - Reinsurance (Deta

Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									$ 1,825,705	$ 1,694,702	$ 1,491,163
Ceded to Other Companies									833,387	736,180	698,847
Assumed from Other Companies									4,945,522	4,361,944	4,500,526
Net Amount	$ 1,657,187	$ 1,598,875	$ 1,369,681	$ 1,312,097	$ 1,441,265	$ 1,371,474	$ 1,288,860	$ 1,218,867	5,937,840	5,320,466	5,292,842
Total Property And Liability Insurance Premiums Earned [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount									1,825,705	1,694,702	1,491,163
Ceded to Other Companies									833,387	736,180	698,847
Assumed from Other Companies									4,945,522	4,361,944	4,500,526
Net Amount									$ 5,937,840	$ 5,320,466	$ 5,292,842
Assumed to Net	83.30%				82.00%				83.30%	82.00%	85.00%