Everest Re (EG) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 01, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity File Number	1-15731
Entity Registrant Name	EVEREST RE GROUP, LTD.
Entity Central Index Key	0001095073
Entity Incorporation State Country Code	D0
Entity Tax Identification Number	98-0365432
Entity Address Address Line 1	Seon Place – 4
Entity Address Address Line 3	141 Front Street
Entity Address Address Line 2	PO Box HM 845
Entity Address City Or Town	Hamilton
Entity Address Postal Zip Code	HM 19
Entity Address Country	BM
City Area Code	441
Local Phone Number	295-0006
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Security 12b Title	Common Shares, $0.01 par value
Trading Symbol	RE
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		40,740,205

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2019, $15,506,555 ; 2018, $15,406,572 )	$ 15,804,524	$ 15,225,263
Fixed maturities - available for sale, at fair value	0	2,337
Equity securities, at fair value	914,654	716,639
Short-term investments (cost: 2019, $744,486 ; 2018, $241,010	744,602	240,987
Other invested assets (cost: 2019, $1,668,705 ; 2018, $1,591,745 )	1,668,705	1,591,745
Cash	661,367	656,095
Total investments and cash	19,793,852	18,433,066
Accrued investment income	109,273	104,619
Premiums receivable	2,389,943	2,218,283
Reinsurance receivables	1,797,866	1,787,648
Funds held by reinsureds	498,043	445,040
Deferred acquisition costs	510,861	511,573
Prepaid reinsurance premiums	476,429	343,343
Income taxes	358,457	592,385
Other assets	453,067	358,042
TOTAL ASSETS	26,387,791	24,793,999
LIABILITIES:
Reserve for losses and loss adjustment expenses	13,249,488	13,119,090
Future policy benefit reserve	45,130	46,778
Unearned premium reserve	2,729,376	2,517,612
Funds held under reinsurance treaties	10,899	13,099
Other net payable to reinsurers	346,151	218,439
Senior notes due 6/1/2044	397,014	396,954
Long term notes due 5/1/2067	236,709	236,659
Accrued interest on debt and borrowings	3,063	3,093
Equity index put option liability	8,374	11,958
Unsettled securities payable	145,568	51,112
Other liabilities	331,859	275,401
Total liabilities	17,503,631	16,890,195
Commitments and contingencies (Note 8)
SHAREHOLDERS' EQUITY:
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding	0	0
Common shares, par value: $0.01; 200,000 shares authorized; (2019) 69,406 and (2018) 69,202 outstanding before treasury shares	694	692
Additional paid-in capital	2,198,461	2,188,777
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $32,754 at 2019 and $(20,697) at 2018	(44,902)	(462,557)
Treasury shares, at cost; 28,665 shares (2019) and 28,551 shares (2018)	(3,422,152)	(3,397,548)
Retained earnings	10,152,059	9,574,440
Total shareholders' equity	8,884,160	7,903,804
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 26,387,791	$ 24,793,999

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fixed maturities - available for sale, at market value, amortized cost	$ 15,506,555	$ 15,406,572
Short-term investments, at cost	744,486	241,010
Other invested assets, at cost	$ 1,668,705	$ 1,591,745
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	200,000,000	200,000,000
Common shares, outstanding	69,406,000	69,202,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit)	$ 32,754	$ (20,697)
Treasury shares	28,665,000	28,551,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt instrument, maturity date	Jun. 1, 2044
6.6 % Long Term Subordinated Notes [Member] | Subordinated Debt [Member]
Debt instrument, maturity date	May 1, 2067

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
REVENUES:
Premiums earned	$ 1,817,299	$ 1,729,818	$ 3,549,996	$ 3,349,245
Net investment income	179,028	141,322	320,004	279,616
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	5,157	888	8,090	958
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)	0	0	0	0
Other net realized capital gains (losses)	35,429	16,664	130,594	(8,167)
Total net realized capital gains (losses)	30,272	15,776	122,504	(9,125)
Net derivative gain (loss)	353	2,987	3,584	3,260
Other income (expense)	(7,977)	3,036	(17,030)	15,100
Total revenues	2,018,975	1,892,939	3,979,058	3,638,096
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	1,094,630	1,341,314	2,143,180	2,398,491
Commission, brokerage, taxes and fees	420,950	383,402	810,424	741,041
Other underwriting expenses	104,833	93,099	203,818	189,383
Corporate expenses	7,535	6,633	14,187	15,629
Interest, fees and bond issue cost amortization expense	8,434	7,728	16,065	15,146
Total claims and expenses	1,636,382	1,832,176	3,187,674	3,359,690
INCOME (LOSS) BEFORE TAXES	382,593	60,763	791,384	278,406
Income tax expense (benefit)	39,738	(9,132)	99,629	(1,807)
NET INCOME (LOSS)	342,855	69,895	691,755	280,213
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	197,759	(41,776)	430,824	(232,400)
Reclassification adjustment for realized losses (gains) included in net income (loss)	(1,869)	249	(3,691)	(8,523)
Total URA(D) on securities arising during the period	195,890	(41,527)	427,133	(240,923)
Foreign currency translation adjustments	(25,832)	(63,652)	(11,780)	(45,953)
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	1,151	1,815	2,302	3,630
Total benefit plan net gain (loss) for the period	1,151	1,815	2,302	3,630
Total other comprehensive income (loss), net of tax	171,209	(103,364)	417,655	(283,246)
COMPREHENSIVE INCOME (LOSS)	$ 514,064	$ (33,469)	$ 1,109,410	$ (3,033)
EARNINGS PER COMMON SHARE:
Basic	$ 8.42	$ 1.71	$ 16.98	$ 6.85
Diluted	$ 8.39	$ 1.70	$ 16.93	$ 6.81

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Change to beginning balance due to adoption of Accounting Standards Update 2016-01	$ 1,201				$ (1,201)	$ 1,201
Balance, beginning of period at Dec. 31, 2017			$ 691	$ 2,165,768	(160,891)	9,685,908	$ (3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017		40,835,272
Issued during the period, net, shares		143,362
Treasury shares acquired, shares		0
Issued during the period, net			1
Share-based compensation plans				(2,249)
Net increase (decrease) during the period					(179,882)
Net income (loss)						210,318
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)						(53,240)
Purchase of treasury shares							0
Balance, end of period at Mar. 31, 2018			692	2,163,519	(341,974)	9,844,187	(3,322,244)
Balance, end of period, shares at Mar. 31, 2018		40,978,634
Balance, beginning of period at Dec. 31, 2017			691	2,165,768	(160,891)	9,685,908	(3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017		40,835,272
Net increase (decrease) during the period	(283,246)
Net income (loss)	280,213
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(106,480)
Balance, end of period at Jun. 30, 2018	8,241,349		692	2,172,701	(445,338)	9,860,842	(3,347,548)
Balance, end of period, shares at Jun. 30, 2018		40,860,169
Balance, beginning of period at Mar. 31, 2018			692	2,163,519	(341,974)	9,844,187	(3,322,244)
Balance, beginning of period, shares at Mar. 31, 2018		40,978,634
Issued during the period, net, shares		(5,718)
Treasury shares acquired, shares		(112,747)
Issued during the period, net			0
Share-based compensation plans				9,182
Net increase (decrease) during the period	(103,364)				(103,364)
Net income (loss)	69,895					69,895
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(53,240)					(53,240)
Purchase of treasury shares							(25,304)
Balance, end of period at Jun. 30, 2018	8,241,349		692	2,172,701	(445,338)	9,860,842	(3,347,548)
Balance, end of period, shares at Jun. 30, 2018		40,860,169
Change to beginning balance due to adoption of Accounting Standards Update 2016-01					0	0
Balance, beginning of period at Dec. 31, 2018	$ 7,903,804	$ 692		2,188,777		9,574,440	(3,397,548)
Balance, beginning of period, shares at Dec. 31, 2018	69,202,000	40,651,148
Issued during the period, net, shares		194,584
Treasury shares acquired, shares		(75,193)
Issued during the period, net		$ 2
Share-based compensation plans				767
Net increase (decrease) during the period					246,446
Net income (loss)						348,900
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)						(57,137)
Purchase of treasury shares							(16,153)
Balance, end of period at Mar. 31, 2019		$ 694		2,189,544	(216,111)	9,866,203	(3,413,701)
Balance, end of period, shares at Mar. 31, 2019		40,770,539
Balance, beginning of period at Dec. 31, 2018	$ 7,903,804	$ 692		2,188,777		9,574,440	(3,397,548)
Balance, beginning of period, shares at Dec. 31, 2018	69,202,000	40,651,148
Net increase (decrease) during the period	$ 417,655
Net income (loss)	691,755
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(114,136)
Balance, end of period at Jun. 30, 2019	$ 8,884,160	$ 694		2,198,461	(44,902)	10,152,059	(3,422,152)
Balance, end of period, shares at Jun. 30, 2019	69,406,000	40,740,502
Balance, beginning of period at Mar. 31, 2019		$ 694		2,189,544	(216,111)	9,866,203	(3,413,701)
Balance, beginning of period, shares at Mar. 31, 2019		40,770,539
Issued during the period, net, shares		9,403
Treasury shares acquired, shares		(39,440)
Issued during the period, net			$ 0
Share-based compensation plans				8,917
Net increase (decrease) during the period	$ 171,209				171,209
Net income (loss)	342,855					342,855
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)	(56,999)					(56,999)
Purchase of treasury shares							(8,451)
Balance, end of period at Jun. 30, 2019	$ 8,884,160	$ 694		$ 2,198,461	$ (44,902)	$ 10,152,059	$ (3,422,152)
Balance, end of period, shares at Jun. 30, 2019	69,406,000	40,740,502

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 1.40	$ 1.40	$ 1.30	$ 1.30

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 691,755	$ 280,213
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(178,319)	(126,355)
Decrease (increase) in funds held by reinsureds, net	(56,180)	(77,794)
Decrease (increase) in reinsurance receivables	(19,319)	(467,011)
Decrease (increase) in income taxes	180,285	43,516
Decrease (increase) in prepaid reinsurance premiums	(137,092)	(86,044)
Increase (decrease) in reserve for losses and loss adjustment expenses	155,096	223,202
Increase (decrease) in future policy benefit reserve	(1,648)	(2,169)
Increase (decrease) in unearned premiums	219,263	151,528
Increase (decrease) in other net payable to reinsurers	132,474	101,970
Increase (decrease) in losses in course of payment	35,738	162,073
Change in equity adjustments in limited partnerships	(57,031)	(45,898)
Distribution of limited partnership income	41,321	42,269
Change in other assets and liabilities, net	(60,820)	(111,220)
Non-cash compensation expense	17,171	17,566
Amortization of bond premium (accrual of bond discount)	13,321	17,677
Net realized capital (gains) losses	(122,504)	9,125
Net cash provided by (used in) operating activities	853,511	132,648
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	1,009,921	1,099,762
Proceeds from fixed maturities sold - available for sale, at market value	2,318,207	1,225,373
Proceeds from fixed maturities sold - available for sale, at fair value	2,706	1,065
Proceeds from equity securities sold, at fair value	149,233	576,382
Distributions from other invested assets	143,752	2,978,865
Cost of fixed maturities acquired - available for sale, at market value	(3,466,331)	(2,163,331)
Cost of fixed maturities acquired - available for sale, at fair value	0	(4,381)
Cost of equity securities acquired, at fair value	(229,070)	(722,797)
Cost of other invested assets acquired	(207,323)	(3,168,655)
Net change in short-term investments	(499,983)	213,242
Net change in unsettled securities transactions	88,531	(33,351)
Net cash provided by (used in) investing activities	(690,357)	2,174
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period for share-based compensation, net of expense	(7,485)	(9,431)
Purchase of treasury shares	(24,604)	(25,304)
Dividends paid to shareholders	(114,136)	(106,480)
Cost of shares withheld on settlements of share-based compensation awards	(11,748)	(14,859)
Net cash provided by (used in) financing activities	(157,973)	(156,074)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	91	5,678
Net increase (decrease) in cash	5,272	(15,574)
Cash, beginning of period	656,095	635,067
Cash, end of period	661,367	619,493
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	(83,995)	(44,151)
Interest paid	$ 15,984	$ 14,754

General

General	6 Months Ended
	Jun. 30, 2019
General [Abstract]
General	1. GENERAL 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 writes insurance business mainly in the European markets.

Basis Of Presentation

Basis Of Presentation	6 Months Ended
	Jun. 30, 2019
Basis Of Presentation [Abstract]
Basis Of Presentation	2. BASIS OF PRESENTATION The unaudited consolidated financial statements of the Company for the three and six months ended June 30, 2019 and 2018 include all adjustments, consisting of normal recurring accruals, which, in the opinion of management, are necessary for a fair statement of the results on an interim basis. Certain financial information, which is normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), has been omitted since it is not required for interim reporting purposes. The December 31, 2018 consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The results for the three and six months ended June 30, 2019 and 2018 are not necessarily indicative of the results for a full year. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the years ended December 31, 2018, 2017 and 2016 included in the Company’s most recent Form 10-K filing. 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. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Ultimate actual results could differ, possibly materially, from those estimates. All intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior years’ amounts to conform to the 2019 presentation. Application of Recently Issued Accounting Standard Changes. Accounting for Cloud Computing Arrangement . In August 2018, The Financial Accounting Standards Board (“FASB”) issued ASU 2018-15, which outlines accounting for implementation costs of a cloud computing arrangement that is a service contract. This guidance requires that implementation costs of a cloud computing arrangement that is a service contract must be capitalized and expensed in accordance with the existing provisions provided in Subtopic 350-40 regarding development of internal use software. In addition, any capitalized implementation costs should be amortized over the term of the hosting arrangement. The guidance is effective for annual reporting periods beginning after December 15, 2019 and interim periods within that annual reporting period. The Company is currently evaluating the impact of the adoption of ASU 2018-15 on its financial statements. Accounting for Long Duration Contracts . In August 2018, FASB issued ASU 2018-12, which discusses changes to the recognition, measurement and presentation of long duration contracts. The main provisions of this guidance address the following: 1) In determining liability for future policy benefits, companies must review cash flow assumptions at least annually and the discount rate assumption at each reporting period date 2) Amortization of deferred acquisition costs has been simplified to be in constant level proportion to either premiums, gross profits or gross margins 3) Disaggregated roll forwards of beginning and ending liabilities for future policy benefits are required. The guidance is effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. The Company is currently evaluating the impact of the adoption of ASU 2018-12 on its financial statements. Accounting for Deferred Taxes in Accumulated Other Comprehensive Income (AOCI) . In February 2018, FASB issued ASU 2018-02 which outlines guidance on the treatment of trapped deferred taxes contained within AOCI on the consolidated balance sheets. The new guidance allows the amount of trapped deferred taxes in AOCI, resulting from the change in the U.S. tax rate from 35% to 21% upon enactment of the Tax Cuts and Jobs Act (“TCJA”), to be reclassified as part of retained earnings in the consolidated balance sheets. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018, but early adoption is allowed. The Company decided to early adopt the guidance as of December 31, 2017. The adoption resulted in a reclass of $ 1,250 thousand between AOCI and retained earnings during the fourth quarter of 2017. As an accounting policy, the Company has adopted the aggregate portfolio approach for releasing disproportionate income tax effects from AOCI. Accounting for Impact on Income Taxes due to Tax Reform . In December 2017, the SEC issued Staff Accounting Bulletin (“SAB”) 118 which provides guidance on the application of FASB Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, due to the enactment of TCJA. SAB 118 became effective upon release. The Company has adopted the provisions of SAB 118 with respect to measuring the tax effects for the modifications to the determination of tax basis loss reserves. In 2018, the Company recorded adjustments to the amount of tax expense it recorded in 2017 with respect to the TCJA as estimated amounts were finalized, which did not have a material impact on the Company’s financial statements. Amortization of Bond Premium . In March 2017, FASB issued ASU 2017-08 which outlines guidance on the amortization period for premium on callable debt securities. The new guidance requires that the premium on callable debt securities be amortized through the earliest call date rather than through the maturity date of the callable security. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018. The adoption of ASU 2017-08 did not have a material impact on the Company’s financial statements. Presentation and Disclosure of Net Periodic Benefit Costs . In March 2017, FASB issued ASU 2017-07 which outlines guidance on the presentation of net periodic costs of benefit plans. The new guidance requires that the service cost component of net periodic benefit costs be reported within the same line item of the statements of operations as other compensation costs are reported. Other components of net periodic benefit costs should be reported separately. Footnote disclosure is required to state within which line items of the statements of operations the components are reported. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2017-07 did not have a material impact on the Company’s financial statements. Disclosure of Restricted Cash . In November 2016, FASB issued ASU 2016-18 and in August 2016, FASB issued ASU 2016-15 which outline guidance on the presentation in the statements of cash flows of changes in restricted cash. The new guidance requires that the statements of cash flows should reflect all changes in cash, cash equivalents and restricted cash in total and not segregated individually. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-18 and ASU 2016-15 did not have a material impact on the Company’s financial statements. Intra-Entity Asset Transfers . In October 2016, FASB issued ASU 2016-16 which outlines guidance on the tax accounting for intra-entity asset sales and transfers, other than inventory. The new guidance requires that reporting entities recognize tax expense from the intra-entity transfer of an asset in the seller’s tax jurisdiction at the time of transfer and recognize any deferred tax asset in the buyer’s tax jurisdiction at the time of transfer. The guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-16 did not have a material impact on the Company’s financial statements. Valuation of Financial Instruments . In June 2016, FASB issued ASU 2016-13 which outlines guidance on the valuation of and accounting for assets measured at amortized cost and available for sale debt securities. The carrying value of assets measured at amortized cost will now be presented as the amount expected to be collected on the financial asset (amortized cost less an allowance for credit losses valuation account). Available for sale debt securities will now record credit losses through an allowance for credit losses, which will be limited to the amount by which fair value is below amortized cost. The guidance is effective for annual and interim reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact of the adoption of ASU 2016-13 on its financial statements. Accounting for Share-Based Compensation . In March 2016, the FASB issued ASU 2016-09, authoritative guidance regarding the accounting for share-based compensation. This guidance requires that the income tax effects resulting from the change in the value of share-based compensation awards between grant and settlement will be recorded as part of the consolidated statements of operations and comprehensive income/(loss). Previously, excess tax benefits have been recorded as part of the additional paid in capital within the consolidated balance sheets. The guidance is effective for annual reporting periods beginning after December 15, 2016 and interim periods within that annual reporting period. The Company has implemented this guidance prospectively as of January 1, 2017. The guidance also requires that the cost of employee taxes paid via shares withheld upon settlement of share-based compensation awards must be shown as a financing activity within the Statements of Cash Flows. The Company has implemented this guidance retrospectively as of January 1, 2017. Leases . In February 2016, FASB issued ASU 2016-02 (and subsequently issued ASU 2018-11 in July, 2018) which outline new guidance on the accounting for leases. The new guidance requires the recognition of lease assets and lease liabilities on the balance sheets for most leases that were previously deemed operating leases and required only lease expense presentation in the statements of operations. The guidance is effective for annual and interim reporting periods beginning after December 15, 2018. The Company adopted ASU 2016-02 effective January 1, 2019 and elected to utilize a cumulative-effect adjustment to the opening balance of retained earnings for the year of adoption. Accordingly, the Company’s reporting for the comparative periods prior to adoption continue to be presented in the financial statements in accordance with previous lease accounting guidance. The Company also elected to apply the package of practical expedients applicable to the Company in the updated guidance for transition for leases in effect at adoption. The Company did not elect the hindsight practical expedient to determine the lease term of existing leases (e.g. The Company did not re-assess lease renewals, termination options nor purchase options in determining lease terms). The adoption of the updated guidance resulted in the Company recognizing a right-of-use asset of $ 69,869 thousand as part of other assets and a lease liability of $ 77,270 thousand as part of other liabilities in the consolidated balance sheet at the time of adoption, as well as de-recognizing the liability for deferred rent that was required under the previous guidance. The cumulative effect adjustment to the opening balance of retained earnings was zero Recognition and Measurement of Financial Instruments . In January 2016, the FASB issued ASU 2016-01 which outlines revised guidance on the accounting for equity investments. The new guidance states that all equity investments in unconsolidated entities will be measured at fair value, with the change in value being recorded through the income statement rather than being recorded within other comprehensive income. The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2016-01 resulted in a cumulative change adjustment of $ 1,201 thousand between AOCI and retained earnings, which is disclosed separately within the consolidated statement of changes in shareholders’ equity. Revenue Recognition . In May 2014, the FASB issued ASU 2014-09 and in August 2015, FASB issued ASU 2015-14 which outline revised guidance on the recognition of revenue arising from contracts with customers. The new guidance states that reporting entities should apply certain steps to determine when revenue should be recognized, based upon fulfillment of performance obligations to complete contracts. The updated guidance is effective for annual and interim reporting periods beginning after December 15, 2017. The Company adopted the guidance effective January 1, 2018. The adoption of ASU 2014-09 and ASU 2015-14 did not have a material impact on the Company’s financial statements. Any issued guidance and pronouncements, other than those directly referenced above, are deemed by the Company to be either not applicable or immaterial to its financial statements.

Investments

Investments	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Investments	3. 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 June 30, 2019 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,301,006 $ 33,777 $ ( 2,578) $ 1,332,205 $ - Obligations of U.S. states and political subdivisions 502,025 27,035 ( 351) 528,709 - Corporate securities 5,892,619 161,213 ( 33,382) 6,020,450 368 Asset-backed securities 759,213 2,346 ( 1,958) 759,601 - Mortgage-backed securities Commercial 677,210 26,967 ( 927) 703,250 - Agency residential 2,294,248 28,879 ( 11,711) 2,311,416 - Non-agency residential 8,381 39 ( 15) 8,405 - Foreign government securities 1,293,568 49,162 ( 39,548) 1,303,182 - Foreign corporate securities 2,778,285 113,443 ( 54,422) 2,837,306 434 Total fixed maturity securities $ 15,506,555 $ 442,861 $ ( 144,892) $ 15,804,524 $ 802 At December 31, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,629,454 $ 16,781 $ ( 15,101) $ 2,631,134 $ - Obligations of U.S. states and political subdivisions 490,018 12,915 ( 2,839) 500,094 439 Corporate securities 5,538,582 48,465 ( 141,515) 5,445,532 1,688 Asset-backed securities 545,427 162 ( 5,492) 540,097 - Mortgage-backed securities Commercial 329,883 2,167 ( 5,340) 326,710 - Agency residential 1,832,760 7,325 ( 43,821) 1,796,264 - Non-agency residential 10,198 37 ( 26) 10,209 - Foreign government securities 1,335,328 34,743 ( 55,906) 1,314,165 98 Foreign corporate securities 2,694,922 63,994 ( 97,858) 2,661,058 320 Total fixed maturity securities $ 15,406,572 $ 186,589 $ ( 367,898) $ 15,225,263 $ 2,545 (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date. Effective January 1, 2018, the Company adopted ASU 2016-01, which requires equity investments in unconsolidated entities to be measured at fair value, with any change in value being recorded within net realized capital gains/(losses) as part of the consolidated statements of operations and comprehensive income (loss). Previously, changes in the market value had been recorded within AOCI as part of the consolidated balance sheets. Therefore, effective January 1, 2018, equity security investments no longer have an impact upon the AOCI balance. 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 June 30, 2019 At December 31, 2018 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,566,736 $ 1,579,362 $ 1,328,571 $ 1,330,534 Due after one year through five years 6,605,036 6,687,305 8,114,247 8,016,490 Due after five years through ten years 2,761,724 2,880,168 2,455,911 2,413,846 Due after ten years 834,007 875,017 789,575 791,113 Asset-backed securities 759,213 759,601 545,427 540,097 Mortgage-backed securities: Commercial 677,210 703,250 329,883 326,710 Agency residential 2,294,248 2,311,416 1,832,760 1,796,264 Non-agency residential 8,381 8,405 10,198 10,209 Total fixed maturity securities $. 15,506,555 $. 15,804,524 $. 15,406,572 $. 15,225,263 The changes in net unrealized appreciation (depreciation) for the Company’s investments are derived from the following sources for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 227,266 $ ( 40,921) $ 481,160 $ ( 260,406) Fixed maturity securities, other-than-temporary impairment ( 1,499) 456 ( 1,743) 267 Change in unrealized appreciation (depreciation), pre-tax 225,767 ( 40,465) 479,417 ( 260,139) Deferred tax benefit (expense) ( 29,954) ( 1,007) ( 52,431) 19,292 Deferred tax benefit (expense), other-than-temporary impairment 77 ( 55) 147 ( 76) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ 195,890 $ ( 41,527) $ 427,133 $ ( 240,923) The Company frequently reviews all of its fixed maturity, available for sale securities for declines in market value and focuses its attention on securities whose fair value has fallen below 80% of their amortized cost at the time of review. The Company then assesses whether the decline in value is temporary or other-than-temporary. In making its assessment, the Company evaluates the current market and interest rate environment as well as specific issuer information. Generally, a change in a security’s value caused by a change in the market, interest rate or foreign exchange environment does not constitute an other-than-temporary impairment, but rather a temporary decline in market value. Temporary declines in market value are recorded as unrealized losses in accumulated other comprehensive income (loss). If the Company determines that the decline is other-than-temporary and the Company does not have the intent to sell the security; and it is more likely than not that the Company will not have to sell the security before recovery of its cost basis, the carrying value of the investment is written down to fair value. The fair value adjustment that is credit or foreign exchange related is recorded in net realized capital gains (losses) in the Company’s consolidated statements of operations and comprehensive income (loss). The fair value adjustment that is non-credit related is recorded as a component of other comprehensive income (loss), net of tax, and is included in accumulated other comprehensive income (loss) in the Company’s consolidated balance sheets. The Company’s assessments are based on the issuers’ current and expected future financial position, timeliness with respect to interest and/or principal payments, speed of repayments and any applicable credit enhancements or breakeven constant default rates on mortgage-backed and asset-backed securities, as well as relevant information provided by rating agencies, investment advisors and analysts. Upon the adoption of ASU 2016-01 as of January 1, 2018, all equity investments in unconsolidated entities are recorded at fair value. Prior to the adoption of ASU 2016-01, the Company presented certain equity securities at market value. The majority of the Company’s equity securities presented at market value prior to January 1, 2018 were primarily comprised of mutual fund investments whose underlying securities consisted of fixed maturity securities. When a fund’s value reflected an unrealized loss, the Company assessed whether the decline in value was temporary or other-than-temporary. In making its assessment, the Company considered the composition of its portfolios and their related markets, reports received from the portfolio managers and discussions with portfolio managers. If the Company determined that the declines were temporary and it had the ability and intent to continue to hold the investments, then the declines were recorded as unrealized losses in accumulated other comprehensive income (loss). If declines were deemed to be other-than-temporary, then the carrying value of the investment was 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 June 30, 2019 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 37,959 $ ( 11) $ 352,523 $ ( 2,567) $ 390,482 $ ( 2,578) Obligations of U.S. states and political subdivisions 2,994 ( 50) 9,840 ( 301) 12,834 ( 351) Corporate securities 243,339 ( 9,044) 956,838 ( 24,338) 1,200,177 ( 33,382) Asset-backed securities 313,948 ( 1,051) 206,558 ( 907) 520,506 ( 1,958) Mortgage-backed securities Commercial 3,168 ( 35) 75,713 ( 892) 78,881 ( 927) Agency residential 38,520 ( 100) 1,068,294 ( 11,611) 1,106,814 ( 11,711) Non-agency residential 6,902 ( 15) - - 6,902 ( 15) Foreign government securities 133,946 ( 6,114) 355,728 ( 33,434) 489,674 ( 39,548) Foreign corporate securities 158,663 ( 5,387) 635,609 ( 49,035) 794,272 ( 54,422) Total fixed maturity securities $ 939,439 $ ( 21,807) $ 3,661,103 $ ( 123,085) $ 4,600,542 $ ( 144,892) Duration of Unrealized Loss at June 30, 2019 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 72,925 $ ( 1,270) $ 653,276 $ ( 21,829) $ 726,201 $ ( 23,099) Due in one year through five years 251,725 ( 4,989) 1,317,255 ( 64,110) 1,568,980 ( 69,099) Due in five years through ten years 223,082 ( 12,638) 216,841 ( 12,797) 439,923 ( 25,435) Due after ten years 29,169 ( 1,709) 123,166 ( 10,939) 152,335 ( 12,648) Asset-backed securities 313,948 ( 1,051) 206,558 ( 907) 520,506 ( 1,958) Mortgage-backed securities 48,590 ( 150) 1,144,007 ( 12,503) 1,192,597 ( 12,653) Total fixed maturity securities $ 939,439 $ ( 21,807) $ 3,661,103 $ ( 123,085) $ 4,600,542 $ ( 144,892) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at June 30, 2019 were $ 4,600,542 thousand and $ 144,892 thousand, respectively. The market value of securities for the single issuer whose securities comprised the largest unrealized loss position at June 30, 2019, did not exceed 0.9% of the overall market value of the Company’s fixed maturity securities. In addition, as indicated on the above table, there was no significant concentration of unrealized losses in any one market sector. The $ 21,807 thousand of unrealized losses related to fixed maturity securities that have been in an unrealized loss position for less than one year were generally comprised of domestic and foreign corporate securities, foreign government securities and asset-backed securities. Of these unrealized losses, $ 12,934 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. The $ 123,085 thousand of unrealized losses related to fixed maturity securities in an unrealized loss position for more than one year related primarily to foreign and domestic corporate securities, foreign government securities, agency residential mortgage-backed securities and U.S. government agencies and corporations. Of these unrealized losses, $ 106,852 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. There was no The Company, given the size of its investment portfolio and capital position, does not have the intent to sell these securities; and it is more likely than not that the Company will not have to sell the security before recovery of its cost basis. In addition, all securities currently in an unrealized loss position are current with respect to principal and interest payments. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at December 31, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 76,226 $ ( 158) $ 777,409 $ ( 14,943) $ 853,635 $ ( 15,101) Obligations of U.S. states and political subdivisions 71,559 ( 1,444) 38,105 ( 1,395) 109,664 ( 2,839) Corporate securities 2,513,463 ( 69,619) 1,683,729 ( 71,896) 4,197,192 ( 141,515) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities Commercial 71,167 ( 1,128) 154,201 ( 4,212) 225,368 ( 5,340) Agency residential 156,930 ( 975) 1,373,629 ( 42,846) 1,530,559 ( 43,821) Non-agency residential 10,174 ( 26) - - 10,174 ( 26) Foreign government securities 196,303 ( 9,719) 494,156 ( 46,187) 690,459 ( 55,906) Foreign corporate securities 939,808 ( 35,023) 782,405 ( 62,835) 1,722,213 ( 97,858) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898) Duration of Unrealized Loss at December 31, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 454,239 $ ( 2,558) $ 427,513 $ ( 20,675) $ 881,752 $ ( 23,233) Due in one year through five years 2,014,704 ( 45,148) 2,764,981 ( 129,940) 4,779,685 ( 175,088) Due in five years through ten years 1,082,568 ( 51,300) 492,216 ( 34,210) 1,574,784 ( 85,510) Due after ten years 245,848 ( 16,957) 91,094 ( 12,431) 336,942 ( 29,388) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities 238,271 ( 2,129) 1,527,830 ( 47,058) 1,766,101 ( 49,187) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2018 were $ 9,814,849 thousand and $ 367,898 thousand, respectively. The market value of securities for the single issuer (the United States government) whose securities comprised the largest unrealized loss position at December 31, 2018, did not exceed 5.7% of the overall market value of the Company’s fixed maturity securities. The market value of the securities for the issuer with the second largest unrealized loss comprised less than 1.0% of the Company’s fixed maturity securities. In addition, as indicated on the above table, there was no significant concentration of unrealized losses in any one market sector. The $ 120,838 thousand of unrealized losses related to fixed maturity securities that have been in an unrealized loss position for less than one year were generally comprised of domestic and foreign corporate securities, foreign government securities and asset-backed securities. Of these unrealized losses, $ 74,729 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. The $ 247,060 thousand of unrealized losses related to fixed maturity securities in an unrealized loss position for more than one year related primarily to domestic and foreign corporate securities, foreign government securities, agency residential mortgage-backed securities and U.S. government agencies and corporations. Of these unrealized losses, $ 230,560 thousand were related to securities that were rated investment grade by at least one nationally recognized statistical rating agency. There was no related to sub-prime and alt-A loans. In all instances, there were no projected cash flow shortfalls to recover the full book value of the investments and the related interest obligations. The mortgage-backed securities still have excess credit coverage and are current on interest and principal payments. The components of net investment income are presented in the table below for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Fixed maturities $ 126,593 $ 114,824 $ 253,301 $ 223,506 Equity securities 4,596 6,672 8,103 13,499 Short-term investments and cash 5,393 2,092 9,598 3,824 Other invested assets Limited partnerships 48,243 21,996 56,540 45,377 Other 3,299 2,659 6,279 6,984 Gross investment income before adjustments 188,124 148,243 333,821 293,190 Funds held interest income (expense) 1,422 1,939 7,390 5,569 Future policy benefit reserve income (expense) ( 359) ( 359) ( 593) ( 568) Gross investment income 189,187 149,823 340,618 298,191 Investment expenses ( 10,159) ( 8,501) ( 20,614) ( 18,575) Net investment income $ 179,028 $ 141,322 $ 320,004 $ 279,616 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 $ 823,622 thousand in limited partnerships and private placement loans at June 30, 2019. These commitments will be funded when called in accordance with the partnership and loan agreements, which have investment periods that expire, unless extended, through 2023 Beginning in the first quarter of 2016, the Company participated in a private placement liquidity sweep facility (“the facility”). The primary purpose of the facility is to enhance the Company’s return on its short-term investments and cash positions. The facility invests in high quality, short-duration securities and permits daily liquidity. Through the second quarter of 2018, the Company’s participation in the facility was classified within other invested assets on the Company’s Balance Sheets. Starting in the third quarter of 2018, the Company has consolidated its participation in the facility. As a result of the consolidation of the underlying investments of the facility, effective July 1, 2018, the Company has reclassified $ 143,656 thousand from other invested assets to fixed maturity securities, available for sale, at market value and has reclassified $ 243,864 thousand from other invested assets to short-term investments. As of June 30, 2019, the market value of investments in the facility consolidated within the Company’s balance sheets was $ 717,083 thousand. The components of net realized capital gains (losses) are presented in the table below for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Fixed maturity securities, market value: Other-than-temporary impairments $ ( 5,157) $ ( 888) $ ( 8,090) $ ( 958) Gains (losses) from sales 6,097 ( 43) 11,370 10,349 Fixed maturity securities, fair value: Gains (losses) from sales 356 ( 1,068) 356 ( 1,082) Gains (losses) from fair value adjustments - 958 13 958 Equity securities, fair value: Gains (losses) from sales ( 1,315) ( 1,563) 3,733 ( 1,523) Gains (losses) from fair value adjustments 30,362 17,800 114,803 ( 17,453) Other invested assets ( 153) 581 243 584 Short-term investments gain (loss) 82 ( 1) 76 - Total net realized capital gains (losses) $ 30,272 $ 15,776 $ 122,504 $ ( 9,125) 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: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Proceeds from sales of fixed maturity securities $ 522,687 $ 862,150 $ 2,320,913 $ 1,226,438 Gross gains from sales 11,908 6,824 28,046 19,826 Gross losses from sales ( 5,455) ( 7,935) ( 16,320) ( 10,559) Proceeds from sales of equity securities $ 79,733 $ 376,507 $ 149,233 $ 576,382 Gross gains from sales 2,576 7,359 8,251 14,046 Gross losses from sales ( 3,891) ( 8,922) ( 4,518) ( 15,569)

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	6 Months Ended
	Jun. 30, 2019
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Reserve For Losses LAE And Future Policy Benefit Reserve	4. RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE Activity in the reserve for losses and LAE is summarized for the periods indicated: Six Months Ended June 30, (Dollars in thousands) 2019 2018 Gross reserves beginning of period $ 13,119,090 $ 11,884,321 Less reinsurance recoverables ( 1,619,641) ( 1,212,649) Net reserves beginning of period 11,499,449 10,671,672 Incurred related to: Current year 2,135,335 1,963,766 Prior years 7,845 434,725 Total incurred losses and LAE 2,143,180 2,398,491 Paid related to: Current year 374,123 490,884 Prior years 1,598,544 2,089,606 Total paid losses and LAE 1,972,667 2,580,490 Foreign exchange/translation adjustment ( 57,392) ( 67,978) Net reserves end of period 11,612,570 10,421,695 Plus reinsurance recoverables 1,636,918 1,621,639 Gross reserves end of period $ 13,249,488 $ 12,043,334 (Some amounts may not reconcile due to rounding.) Incurred prior years losses increased slightly by $ 7,845 thousand for the six months ended June 30, 2019 and increased by $, 434725 thousand for the six months ended June 30, 2018. The increase for the six months ended June 30, 2018 was mainly due to $ 532,155 thousand of adverse development on prior years catastrophe losses, primarily related to Hurricanes Harvey, Irma and Maria, as well as the 2017 California wildfires. The increase in loss estimates for Hurricanes Harvey, Irma and Maria was mostly driven by re-opened claims, loss inflation from higher than expected loss adjustment expenses and in particular, their impact on aggregate covers. This reserve increase was partially offset by $ 97,430 thousand of favorable development on prior years attritional losses which mainly related to U.S. and international property and casualty reinsurance business.

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2019
Derivatives [Abstract]
Derivatives	5. DERIVATIVES The Company sold seven two Two June one no The Company had four 1%. The theoretical maximum payouts under these equity index put option contracts would occur if on each of the exercise dates the S&P 500 index value were zero 3% discount factor was $ 353,283 thousand, including $ 80,993 thousand for the contract that expired on July 1, 2019. Conversely, if the contracts had all expired on June 30, 2019, with the S&P index at $ 2,941.76, there would have been no The Company has one 9%. The theoretical maximum payout under the equity index put option contract would occur if on the exercise date the FTSE 100 index value was zero 3% discount factor and current exchange rate was $ 40,113 thousand. Conversely, if the contract had expired on June 30, 2019, with the FTSE index at ₤ 7,425.63, there would have been no At June 30, 2019 and December 31, 2018, the fair value for these equity put options was $ 8,374 thousand and $ 11,958 thousand, respectively. 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 At hedging instruments in balance sheets June 30, 2019 December 31, 2018 Equity index put option contracts Equity index put option liability $ 8,374 $ 11,958 Total $ 8,374 $ 11,958 The change in fair value of the equity index put option contracts can be found in the Company’s statement of operations and comprehensive income (loss) as follows: (Dollars in thousands) For the Three Months Ended For Six Months Ended Derivatives not designated as Location of gain (loss) in statements of June 30, June 30, hedging instruments operations and comprehensive income (loss) 2019 2018 2019 2018 Equity index put option contracts Net derivative gain (loss) $ 353 $ 2,987 $ 3,584 $ 3,260 Total $ 353 $ 2,987 $ 3,584 $ 3,260

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value [Abstract]
Fair Value	6. FAIR VALUE GAAP guidance regarding fair value measurements address how companies should measure fair value when they are required to use fair value measures for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based on the transparency of inputs to the valuation of an asset or liability. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement, with Level 1 being the highest priority and Level 3 being the lowest priority. The levels in the hierarchy are defined as follows: Level 1: Inputs to the valuation methodology are observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in an active market; Level 2: Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument; Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The Company’s fixed maturity and equity securities are primarily managed by third party investment asset managers. The investment asset managers obtain prices from nationally recognized pricing services. These services seek to utilize market data and observations in their evaluation process. They use pricing applications that vary by asset class and incorporate available market information and when fixed maturity securities do not trade on a daily basis the services will apply available information through processes such as benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. In addition, they use model processes, such as the Option Adjusted Spread model to develop prepayment and interest rate scenarios for securities that have prepayment features. In limited instances where prices are not provided by pricing services or in rare instances when a manager may not agree with the pricing service, price quotes on a non-binding basis are obtained from investment brokers. The investment asset managers do not make any changes to prices received from either the pricing services or the investment brokers. In addition, the investment asset managers have procedures in place to review the reasonableness of the prices from the service providers and may request verification of the prices. In addition, the Company continually performs analytical reviews of price changes and tests the prices on a random basis to an independent pricing source. No material variances were noted during these price validation procedures. In limited situations, where financial markets are inactive or illiquid, the Company may use its own assumptions about future cash flows and risk-adjusted discount rates to determine fair value. At June 30, 2019, $ 544,971 thousand of fixed maturities, market value were fair valued using unobservable inputs. The majority of the fixed maturities, market value, $ 412,095 thousand, were valued by investment managers’ valuation committees and a majority of these fair values were substantiated by valuations from independent third parties. The Company has procedures in place to review and evaluate these independent third party valuations. The remaining Level 3 fixed maturities of $ 132,876 thousand were valued at either par or amortized cost, which the Company believes approximates fair value. At December 31, 2018, $ 435,959 thousand of fixed maturities, market value and $ 2,337 thousand of fixed maturities, fair value were fair valued using unobservable inputs. The majority of the fixed maturities, market value, $ 354,143 thousand and all of the $ 2,337 thousand of fixed maturities, fair value were valued by investment managers’ valuation committees and a majority of these fair values were substantiated by valuations from independent third parties. The remaining Level 3 fixed maturities of $ 80,663 thousand were fair valued by the Company at either par or amortized cost and $ 1,153 thousand were priced using a non-binding broker quote. The Company internally manages a public equity portfolio which had a fair value at June 30, 2019 and December 31, 2018 of $ 155,784 thousand and $ 124,228 thousand, respectively, and all prices were obtained from publicly published sources. Equity securities denominated in U.S. currency with quoted prices in active markets for identical assets are categorized as level 1 since the quoted prices are directly observable. Equity securities traded on foreign exchanges are categorized as level 2 due to the added input of a foreign exchange conversion rate to determine fair or market value. The Company uses foreign currency exchange rates published by nationally recognized sources. All categories of fixed maturity securities listed in the tables below are generally categorized as level 2, since a particular security may not have traded but the pricing services are able to use valuation models with observable market inputs such as interest rate yield curves and prices for similar fixed maturity securities in terms of issuer, maturity and seniority. For foreign government securities and foreign corporate securities, the fair values provided by the third party pricing services in local currencies, and where applicable, are converted to U.S. dollars using currency exchange rates from nationally recognized sources. The fixed maturities with fair values categorized as level 3 result when prices are not available from the nationally recognized pricing services. The asset managers will then obtain non-binding price quotes for the securities from brokers. The single broker quotes are provided by market makers or broker-dealers who are recognized as market participants in the markets in which they are providing the quotes. The prices received from brokers are reviewed for reasonableness by the third party asset managers and the Company. If the broker quotes are for foreign denominated securities, the quotes are converted to U.S. dollars using currency exchange rates from nationally recognized sources. In limited circumstances when broker prices are not available for private placements, the Company will value the securities using comparable market information or receive fair values from investment managers. The composition and valuation inputs for the presented fixed maturities categories are as follows: • U.S. Treasury securities and obligations of U.S. government agencies and corporations are primarily comprised of U.S. Treasury bonds and the fair value is based on observable market inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields; • Obligations of U.S. states and political subdivisions are comprised of state and municipal bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; • Corporate securities are primarily comprised of U.S. corporate and public utility bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; • Asset-backed and mortgage-backed securities fair values are based on observable inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields and cash flow models using observable inputs such as prepayment speeds, collateral performance and default spreads; • Foreign government securities are comprised of global non-U.S. sovereign bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source; • Foreign corporate securities are comprised of global non-U.S. corporate bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source. The Company’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) June 30, 2019 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,332,205 $ - $ 1,332,205 $ - Obligations of U.S. States and political subdivisions 528,709 - 528,709 - Corporate securities 6,020,450 - 5,477,572 542,878 Asset-backed securities 759,601 - 759,601 - Mortgage-backed securities Commercial 703,250 - 703,250 - Agency residential 2,311,416 - 2,311,416 - Non-agency residential 8,405 - 8,405 - Foreign government securities 1,303,182 - 1,303,182 - Foreign corporate securities 2,837,306 - 2,835,213 2,093 Total fixed maturities, market value 15,804,524 - 15,259,553 544,971 Fixed maturities, fair value - - - - Equity securities, fair value 914,654 834,213 80,441 - Liabilities: Equity index put option contracts $ 8,374 $ - $ - $ 8,374 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) Decemer 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,631,134 $ - $ 2,631,134 $ - Obligations of U.S. States and political subdivisions 500,094 - 500,094 - Corporate securities 5,445,532 - 5,017,317 428,215 Asset-backed securities 540,097 - 540,097 - Mortgage-backed securities Commercial 326,710 - 326,710 - Agency residential 1,796,264 - 1,796,264 - Non-agency residential 10,209 - 10,209 - Foreign government securities 1,314,165 - 1,314,165 - Foreign corporate securities 2,661,058 - 2,653,314 7,744 Total fixed maturities, market value 15,225,263 - 14,789,304 435,959 Fixed maturities, fair value 2,337 - - 2,337 Equity securities, fair value 716,639 674,433 42,206 - Liabilities: Equity index put option contracts $ 11,958 $ - $ - $ 11,958 In addition, $ 154,908 thousand and $ 117,662 thousand of investments within other invested assets on the consolidated balance sheets as June 30, 2019 and December 31, 2018, respectively, are not included within the fair value hierarchy tables as the assets are measured at NAV as a practical expedient to determine fair value. The following tables present the activity under Level 3, fair value measurements using significant unobservable inputs by asset type, for the periods indicated: Total Fixed Maturities, Market Value Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 437,826 $ 7,298 $ 445,124 $ 428,215 $ 7,744 $ 435,959 Total gains or (losses) (realized/unrealized) Included in earnings ( 2,528) ( 238) ( 2,766) 2,330 ( 119) 2,211 Included in other comprehensive income (loss) 1,871 - 1,871 2,444 - 2,444 Purchases, issuances and settlements 101,732 ( 4,967) 96,765 108,370 ( 5,532) 102,838 Transfers in and/or (out) of Level 3 3,977 - 3,977 1,519 - 1,519 Ending balance $ 542,878 $ 2,093 $ 544,971 $ 542,878 $ 2,093 $ 544,971 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 220,555 $ 11,368 $ 231,923 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 624 ( 504) 120 1,346 ( 410) 936 Included in other comprehensive income (loss) 190 - 190 425 - 425 Purchases, issuances and settlements 159,846 1 159,847 169,258 4,323 173,581 Transfers in and/or (out) of Level 3 - 1,750 1,750 - 1,750 1,750 Ending balance $ 381,215 $ 12,615 $ 393,830 $ 381,215 $ 12,615 $ 393,830 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Far Value Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 2,350 $ 2,350 $ 2,337 $ 2,337 Total gains or (losses) (realized/unrealized) Included in earnings 356 356 369 369 Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements ( 2,706) ( 2,706) ( 2,706) ( 2,706) Transfers in and/or (out) of Level 3 - - - - Ending balance $ - $ - $ - $ - The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Far Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 1,821 $ 1,821 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings ( 142) ( 142) ( 156) ( 156) Included in other comprehensive income (loss) 32 32 32 32 Purchases, issuances and settlements 1,481 1,481 3,316 3,316 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,192 $ 3,192 $ 3,192 $ 3,192 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 for fixed maturities, market value were $ 3,977 thousand and $ 1,519 thousand for the three and six months ended June 30, 2019, respectively. The transfers during 2019 were related to securities that were priced using a recognized pricing service as of December 31, 2018. These securities were subsequently priced by investment managers as of June 30, 2019. 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: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 -2018 2019 2018 Liabilities: Balance, beginning of period $ 8,727 $ 12,205 $ 11,958 $ 12,477 Total (gains) or losses (realized/unrealized) Included in earnings ( 353) ( 2,987) ( 3,584) ( 3,260) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Balance, end of period $ 8,374 $ 9,218 $ 8,374 $ 9,218 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.)

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Common Share [Abstract]
Earnings Per Common Share	7. 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. Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands, except per share amounts) 2019 2018 2019 2018 Net income (loss) per share: Numerator Net income (loss) $ 342,855 $ 69,895 $ 691,755 $ 280,213 Less: dividends declared-common shares and nonvested common shares ( 56,999) ( 53,240) ( 114,136) ( 106,480) Undistributed earnings 285,856 16,655 577,619 173,733 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 98.9 % 282,624 16,477 571,326 171,881 Add: dividends declared-common shareholders 56,394 52,705 112,925 105,403 Numerator for basic and diluted earnings per common share $ 339,018 $ 69,183 $ 684,251 $ 277,284 Denominator Denominator for basic earnings per weighted-average common shares 40,277 40,504 40,291 40,487 Effect of dilutive securities: Options 126 206 134 213 Denominator for diluted earnings per adjusted weighted-average common shares 40,404 40,710 40,425 40,699 Per common share net income (loss) Basic $ 8.42 $ 1.71 $ 16.98 $ 6.85 Diluted $ 8.39 $ 1.70 $ 16.93 $ 6.81 (1) Basic weighted-average common shares outstanding 40,277 40,504 40,291 40,487 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,738 40,943 40,735 40,923 Percentage allocated to common shareholders 98.9 % 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 24, 2020 September 19, 2022

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies [Abstract]
Commitments And Contingencies	8. 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 June 30, At December 31, (Dollars in thousands) 2019 2018 The Prudential $ 141,386 $ 142,754 Unaffiliated life insurance company 33,720 34,717

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2019
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	9. OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the components of comprehensive income (loss) in the consolidated statements of operations for the periods indicated: Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ 228,053 $ ( 28,872) $ 199,181 $ 484,683 $ ( 52,263) $ 432,420 URA(D) on securities - OTTI ( 1,499) 77 ( 1,422) ( 1,743) 147 ( 1,596) Reclassification of net realized losses (gains) included in net income (loss) ( 787) ( 1,082) ( 1,869) ( 3,523) ( 168) ( 3,691) Foreign currency translation adjustments ( 27,823) 1,991 ( 25,832) ( 11,225) ( 555) ( 11,780) Benefit plan actuarial net gain (loss) - - - - - - Reclassification of benefit plan liability amortization included in net income (loss) 1,457 ( 306) 1,151 2,914 ( 612) 2,302 Total other comprehensive income (loss) $ 199,401 $ ( 28,192) $ 171,209 $ 471,106 $ ( 53,451) $ 417,655 Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ ( 41,271) $ ( 906) $ ( 42,177) $ ( 250,431) $ 17,840 $ ( 232,591) URA(D) on securities - OTTI 456 ( 55) 401 267 ( 76) 191 Reclassification of net realized losses (gains) included in net income (loss) 350 ( 101) 249 ( 9,975) 1,452 ( 8,523) Foreign currency translation adjustments ( 69,202) 5,550 ( 63,652) ( 51,857) 5,904 ( 45,953) Reclassification of benefit plan liability amortization included in net income (loss) 2,297 ( 482) 1,815 4,595 ( 965) 3,630 Total other comprehensive income (loss) $ ( 107,370) $ 4,006 $ ( 103,364) $ ( 307,401) $ 24,155 $ ( 283,246) The following table presents details of the amounts reclassified from AOCI for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, Affected line item within the statements of AOCI component 2019 2018 2019 2018 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 787) $ 350 $ ( 3,523) $ ( 9,975) Other net realized capital gains (losses) ( 1,082) ( 101) ( 168) 1,452 Income tax expense (benefit) $ ( 1,869) $ 249 $ ( 3,691) $ ( 8,523) Net income (loss) Benefit plan net gain (loss) $ 1,457 $ 2,297 $ 2,914 $ 4,595 Other underwriting expenses ( 306) ( 482) ( 612) ( 965) Income tax expense (benefit) $ 1,151 $ 1,815 $ 2,302 $ 3,630 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: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Beginning balance of URA (D) on securities $ 51,851 $ ( 150,628) $ ( 179,392) $ 49,969 Change to beginning balance due to adoption of ASU 2016-01 - - - ( 1,201) Current period change in URA (D) of investments - temporary 197,312 ( 41,928) 428,729 ( 241,114) Current period change in URA (D) of investments - non-credit OTTI ( 1,422) 401 ( 1,596) 191 Ending balance of URA (D) on securities 247,741 ( 192,155) 247,741 ( 192,155) Beginning balance of foreign currency translation adjustments ( 201,695) ( 121,232) ( 215,747) ( 138,931) Current period change in foreign currency translation adjustments ( 25,832) ( 63,652) ( 11,780) ( 45,953) Ending balance of foreign currency translation adjustments ( 227,527) ( 184,884) ( 227,527) ( 184,884) Beginning balance of benefit plan net gain (loss) ( 66,267) ( 70,114) ( 67,418) ( 71,929) Current period change in benefit plan net gain (loss) 1,151 1,815 2,302 3,630 Ending balance of benefit plan net gain (loss) ( 65,116) ( 68,299) ( 65,116) ( 68,299) Ending balance of accumulated other comprehensive income (loss) $ ( 44,902) $ ( 445,338) $ ( 44,902) $ ( 445,338) (Some amounts may not reconcile due to rounding.)

Credit Facilities

Credit Facilities	6 Months Ended
	Jun. 30, 2019
Credit Facilities [Abstract]
Credit Facilities	10. CREDIT FACILITIES The Company has two 1,000,000 thousand and an additional credit facility for a total commitment of up to £ 30,000 thousand, providing for the issuance of letters of credit and/or unsecured revolving credit lines. The following table presents the interest and fees incurred in connection with the two credit facilities for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Credit facility interest and fees incurred $ 105 $ 105 $ 210 $ 210 The terms and outstanding amounts for each facility are discussed below: Group Credit Facility Effective May 26, 2016, Group, Everest Reinsurance (Bermuda), Ltd. (“Bermuda Re”) and Everest International Reinsurance, Ltd. (“Everest International”), both direct subsidiaries of Group, entered into a five year, $ 800,000 thousand senior credit facility with a syndicate of lenders, which amended and restated in its entirety the June 22, 2012, four year, $ 800,000 thousand senior credit facility. Both the May 26, 2016 and June 22, 2012 senior credit facilities, which have similar terms, are referred to as the “Group Credit Facility”. Wells Fargo Corporation (“Wells Fargo Bank”) is the administrative agent for the Group Credit Facility, which consists of two tranches. Tranche one provides up to $ 200,000 thousand of unsecured revolving credit for liquidity and general corporate purposes, and for the issuance of unsecured standby letters of credit. The interest on the revolving loans shall, at the Company’s option, be either (1) the Base Rate (as defined below) or (2) an adjusted London Interbank Offered Rate (“LIBOR”) plus a margin. The Base Rate is the higher of (a) the prime commercial lending rate established by Wells Fargo Bank, (b) the Federal Funds Rate plus 0.5% per annum or (c) the one month LIBOR Rate plus 1.0% per annum. The amount of margin and the fees payable for the Group Credit Facility depends on Group’s senior unsecured debt rating. Tranche two exclusively provides up to $ 600,000 thousand for the issuance of standby letters of credit on a collateralized basis. The Group Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 to 1 and to maintain a minimum net worth. Minimum net worth is an amount equal to the sum of $ 5,370,979 thousand plus 25% of consolidated net income for each of Group’s fiscal quarters, for which statements are available ending on or after March 31, 2016 and for which consolidated net income is positive, plus 25% of any increase in consolidated net worth during such period attributable to the issuance of ordinary and preferred shares, which at June 30, 2019, was $ 6,170,284 thousand. As of June 30, 2019, the Company was in compliance with all Group Credit Facility covenants. The following table summarizes the outstanding letters of credit and/or borrowings for the periods indicated: (Dollars in thousands) At June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 597,058 12/31/2019 600,000 558,818 12/31/2019 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 597,058 $ 800,000 $ 558,818 Bermuda Re Letter of Credit Facility Effective December 10, 2018, Bermuda Re renewed its letter of credit issuance facility with Citibank N.A. referred to as the “Bermuda Re Letter of Credit Facility”, which commitment is reconfirmed annually with updated fees. The current renewal of the Bermuda Re Letter of Credit Facility provides for the issuance of up to $ 200,000 thousand of secured letters of credit to collateralize reinsurance obligations as a non-admitted reinsurer. The interest on drawn letters of credit shall be (A) 0.35% per annum of the principal amount of issued standard letters of credit (expiry of 15 months or less) and (B) 0.45% per annum of the principal amount of issued extended tenor letters of credit (expiry maximum of up to 60 months). The commitment fee on undrawn credit shall be 0.15% per annum. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 3,672 11/24/2019 $ 200,000 $ 3,482 02/28/2019 72,488 12/31/2019 3,672 11/24/2019 3,482 02/29/2020 72,443 12/31/2019 289 08/15/2020 296 08/15/2020 173 12/16/2020 177 12/16/2020 122 12/20/2020 125 12/20/2020 2,989 12/31/2020 1,851 11/04/2022 40,876 06/30/2023 407 11/13/2022 - 59,293 12/30/2022 Total Citibank Bilateral Agreement $ 200,000 $ 124,091 $ 200,000 $ 141,746 Everest International Credit Facility Effective November 9, 2018, Everest International renewed its credit facility with Lloyds Bank plc (“Everest International Credit Facility”). The current renewal of the Everest International Credit Facility has a four year term and provides up to £ 30,000 thousand for the issuance of standby letters of credit on a collateralized basis. The Company pays a commitment fee of 0.1% per annum on the average daily amount of the remainder of (1) the aggregate amount available under the facility and (2) the aggregate amount of drawings outstanding under the facility. The Company pays a credit commission fee of 0.35% per annum on drawings outstanding under the facility. The Everest International Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 to 1 and to maintain a minimum net worth. Minimum net worth is an amount equal to the sum of $ 5,326,009 thousand ( 70% of consolidated net worth as of December 31, 2015), plus 25% of consolidated net income for each of Group’s fiscal quarters, for which statements are available ending on or after January 1, 2015 and for which net income is positive, plus 25% of any increase in consolidated net worth of Group during such period attributable to the issuance of ordinary and preferred shares, which at June 30, 2019, was $ 6,161,032 thousand. As of June 30, 2019, the Company was in compliance with all Everest International Credit Facility requirements. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 30,000 £ 24,845 12/31/2022 £ 30,000 £ 26,000 12/31/2022 - - - - Total Lloyd's Bank Credit Facility £ 30,000 £ 24,845 £ 30,000 £ 26,000

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	6 Months Ended
	Jun. 30, 2019
Collateralized Reinsurance And Trust Agreements [Abstract]
Collateralized Reinsurance And Trust Agreements	11. 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 June 30, 2019, the total amount on deposit in trust accounts was $ 894,918 thousand. The Company reinsures some of its catastrophe exposures with the segregated accounts of Mt. Logan Re. Mt. Logan Re is a Class 3 insurer registered in Bermuda effective February 27, 2013 under The Segregated Accounts Companies Act 2000 and 100% of the voting common shares are owned by Group. Separate segregated accounts for Mt. Logan Re began being established effective July 1, 2013 and non-voting, redeemable preferred shares have been issued to capitalize the segregated accounts. Each segregated account invests predominantly in a diversified set of catastrophe exposures, diversified by risk/peril and across different geographic regions globally. The following table summarizes the premiums and losses that are ceded by the Company to Mt. Logan Re segregated accounts and assumed by the Company from Mt. Logan Re segregated accounts. Three Months Ended Six Months Ended June 30, June 30, Mt. Logan Re Segregated Accounts 2019 2018 2019 2018 (Dollars in thousands) Ceded written premiums 58,887 46,641 140,450 130,430 Ceded earned premiums 74,315 65,957 140,640 126,838 Ceded losses and LAE 39,366 135,299 85,415 160,523 Assumed written premiums 2,724 1,604 5,033 4,647 Assumed earned premiums 2,724 1,604 5,033 4,647 Assumed losses and LAE - - - - Each segregated account is permitted to assume net risk exposures equal to the amount of its available posted collateral, which in the aggregate was $ 993,274 thousand and $ 1,156,853 thousand at June 30, 2019 and December 31, 2018, respectively. Of this amount, Group had investments recorded at $ 46,982 thousand and $ 45,625 thousand at June 30, 2019 and December 31, 2018, respectively, in the segregated accounts. Effective April 1, 2018, the Company entered into a retroactive reinsurance transaction with one of the Mt. Logan Re segregated accounts to retrocede $ 269,198 thousand of casualty reserves held by Bermuda Re related to accident years 2002 through 2015. As consideration for entering the agreement, the Company transferred cash of $ 252,000 thousand to the Mt. Logan Re segregated account. The maximum liability to be retroceded under the agreement will be $ 319,000 thousand. The Company will retain liability for any amounts exceeding the maximum liability. On April 24, 2014, the Company entered into two 250,000 thousand of reinsurance coverage from named storms in specified states of the Southeastern United States. The second agreement provides up to $ 200,000 thousand of reinsurance coverage from named storms in specified states of the Southeast, Mid-Atlantic and Northeast regions of the United States and Puerto Rico as well as reinsurance coverage from earthquakes in specified states of the Southeast, Mid-Atlantic, Northeast and West regions of the United States, Puerto Rico and British Columbia. These reinsurance agreements expired in April, 2018 On November 18, 2014, the Company entered into a collateralized reinsurance agreement with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. This agreement is a multi-year reinsurance contract which covers specified earthquake events. The agreement provides up to $ 500,000 thousand of reinsurance coverage from earthquakes in the United States, Puerto Rico and Canada. On December 1, 2015 the Company entered into two 300,000 thousand of reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. The second agreement provides up to $ 325,000 thousand of reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. On April 13, 2017 the Company entered into six 225,000 thousand, $ 400,000 thousand and $ 325,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. The subsequent three 50,000 thousand, $ 75,000 thousand and $ 175,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico and Canada. On April 30, 2018 the Company entered into four four year reinsurance contracts which provide up to $ 62,500 thousand and $ 200,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico, the U.S. Virgin Islands and Canada. The remaining two five year reinsurance contracts which provide up to $ 62,500 thousand and $ 200,000 thousand, respectively, of annual aggregate reinsurance coverage from named storms and earthquakes in the United States, Puerto Rico, the U.S. Virgin Islands and Canada. Recoveries under these collateralized reinsurance agreements with Kilimanjaro are primarily dependent on estimated industry level insured losses from covered events, as well as, the geographic location of the events. The estimated industry level of insured losses is obtained from published estimates by an independent recognized authority on insured property losses. Currently, none of the published insured loss estimates for 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 thousand of notes (“Series 2014-1 Notes”). The $ 450,000 thousand of Series 2014-1 Notes were fully redeemed on April 30, 2018 and are no longer outstanding. On November 18, 2014, Kilimanjaro issued $ 500,000 thousand of notes (“Series 2014-2 Notes”). On December 1, 2015, Kilimanjaro issued $ 625,000 thousand of notes (“Series 2015-1 Notes). On April 13, 2017, Kilimanjaro issued $ 950,000 thousand of notes (“Series 2017-1 Notes) and $ 300,000 thousand of notes (“Series 2017-2 Notes). On April 30, 2018, Kilimanjaro issued $ 262,500 thousand of notes (“Series 2018-1 Notes”) and $ 262,500 thousand of notes (“Series 2018-2 Notes”). The proceeds from the issuance of the Notes listed above are held in reinsurance trust throughout the duration of the applicable reinsurance agreements and invested solely in US government money market funds with a rating of at least “AAAm” by Standard & Poor’s.

Senior Notes

Senior Notes	6 Months Ended
	Jun. 30, 2019
Senior Notes [Abstract]
Senior Notes	12. 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. June 30, 2019 December 31, 2018 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value Senior notes 06-05-2014 06-01-2044 400,000 $ 397,014 $ 429,048 $ 396,954 $ 396,968 On June 5, 2014, Holdings issued $ 400,000 thousand of 30 year senior notes at 4.868%, which will mature on June 1, 2044. Interest will be paid semi-annually on June 1 and December 1 of each year. Interest expense incurred in connection with these senior notes is as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars In thousands 2019 2018 2019 2018 Interest expense incurred $ ( 4,868) $ 4,868 $ 9,736 $ 9,736

Long Term Subordinated Notes

Long Term Subordinated Notes	6 Months Ended
	Jun. 30, 2019
Long Term Subordinated Notes [Abstract]
Long Term Subordinated Notes	13. 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 June 30, 2019 December 31, 2018 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value Long term subordinated notes 04-26-2007 $ 400,000 05-15-2037 05-01-2067 $ 236,709 $ 211,125 $ 236,659 $ 200,390 During the fixed rate interest period from May 3, 2007 May 14, 2017 6.6%, payable semi-annually in arrears on November 15 and May 15 of each year, commencing on November 15, 2007. During the floating rate interest period from May 15, 2017 through maturity, interest will be based on the 3 month LIBOR plus 238.5 basis points, reset quarterly, payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year, subject to Holdings’ right to defer interest on one ten 4.90%. Holdings may redeem the long term subordinated notes on or after May 15, 2017, in whole or in part at 100% of the principal amount plus accrued and unpaid interest; however, redemption on or after the scheduled maturity date and prior to May 1, 2047 is subject to a replacement capital covenant. This covenant is for the benefit of certain senior note holders and it mandates that Holdings receive proceeds from the sale of another subordinated debt issue, of at least similar size, before it may redeem the subordinated notes. Effective upon the maturity of the Company’s 5.40% senior notes on October 15, 2014, the Company’s 4.868% senior notes, due on June 1, 2044, have become the Company’s long term indebtedness that ranks senior to the long term subordinated notes. On March 19, 2009, Group announced the commencement of a cash tender offer for any and all of the 6.60% fixed to floating rate long term subordinated notes. Upon expiration of the tender offer, the Company had reduced its outstanding debt by $ 161,441 thousand. Interest expense incurred in connection with these long term subordinated notes is as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Interest expense incurred $ 3,406 $ 2,702 $ 6,011 $ 5,093

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	14. LEASES Effective January 1, 2019, the Company adopted ASU 2016-02 and ASU 2018-11 which outline new guidance on the accounting for leases. The Company enters into lease agreements for real estate that is primarily used for office space in the ordinary course of business. These leases are accounted for as operating leases, whereby lease expense is recognized on a straight-line basis over the term of the lease. Most leases include an option to extend or renew the lease term. The exercise of the renewal is at the Company’s discretion. The operating lease liability includes lease payments related to options to extend or renew the lease term if the Company is reasonably certain of exercise those options. The Company, in determining the present value of lease payments utilizes either the rate implicit in the lease if that rate is readily determinable or the Company’s incremental secured borrowing rate commensurate with terms of the underlying lease. Supplemental information related to operating leases is as follows for the periods indicated: Three Months Ended Six Months Ended (Dollars in thousands) June 30, June 30, Lease expense incurred: 2019 2019 Operating lease cost $ 6,031 $ 11,218 At June 30, (Dollars in thousands) 2019 Operating lease right of use assets $ 62,468 Operating lease liabilities 69,191 Six Months Ended June 30, (Dollars in thousands) 2019 Operating cash flows from operating leases $ ( 8,926) At June 30, 2019 Weighted average remaining operating lease term 5.9 years Weighted average discount rate on operating leases 4.48 % Maturities of the existing lease liabilities are expected to occur as follows: (Dollars in thousands) Remainder of 2019 $ 9,459 2020 18,653 2021 9,823 2022 9,543 2023 9,291 2024 9,000 Thereafter 20,424 Undiscounted lease payments 86,193 Less: present value adjustment 17,002 Total operating lease liability $ 69,191 On July 2, 2019, the Company entered into a lease agreement to relocate its corporate offices from Liberty Corner, New Jersey to a corporate complex in Warren, New Jersey. The new lease, which covers approximately 315,000 square feet of office space, will be effective October 1, 2019 and runs through 2036. The initial base rent payment of the lease will be approximately $ 650 thousand per month or $ 7,800 thousand per year. The Company expects to relocate the existing operations and employees of the Liberty Corner, New Jersey facility to the new corporate complex by the end of 2020. The amount of operating lease liabilities is not separately presented in the consolidated financial statements but is included in other liabilities. Disclosures regarding minimum lease payments under previous lease accounting guidance can be found in the Company’s 2018 Form 10-K.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Reporting	15. SEGMENT REPORTING The U.S. Reinsurance operation writes property and casualty reinsurance and specialty lines of business, including Marine, Aviation, Surety and Accident and Health (“A&H”) business, on both a treaty and facultative basis, through reinsurance brokers, as well as directly with ceding companies primarily within the U.S. The International operation writes non-U.S. property and casualty reinsurance through Everest Re’s branches in Canada and Singapore and through offices in Brazil, Miami and New Jersey. The Bermuda operation provides reinsurance and insurance to worldwide property and casualty markets through brokers and directly with ceding companies from its Bermuda office and reinsurance to the United Kingdom and European markets through its UK branch and Ireland Re. The Insurance operation writes property and casualty insurance directly and through brokers, surplus lines brokers and general agents within the U.S., Canada and Europe. These segments are managed independently, but conform with corporate guidelines with respect to pricing, risk management, control of aggregate catastrophe exposures, capital, investments and support operations. Management generally monitors and evaluates the financial performance of these operating segments based upon their underwriting results. Underwriting results include earned premium less losses and loss adjustment expenses (“LAE”) incurred, commission and brokerage expenses and other underwriting expenses. We measure our underwriting results using ratios, in particular loss, commission and brokerage and other underwriting expense ratios, which, respectively, divide incurred losses, commissions and brokerage and other underwriting expenses by premiums earned. For inter-affiliate reinsurance and business written through the Lloyd’s Syndicate, business is generally reported within the segment in which the business was first produced, consistent with how the business is managed. The Company does not maintain separate balance sheet data for its operating segments. Accordingly, the Company does not review and evaluate the financial results of its operating segments based upon balance sheet data. The following tables present the underwriting results for the operating segments for the periods indicated: Three Months Ended Six Months Ended U.S. Reinsurance June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 641,764 $ 652,109 $ 1,405,910 $ 1,296,331 Net written premiums 506,840 566,303 1,176,547 1,112,134 Premiums earned $ 620,780 $ 603,884 $ 1,247,251 $ 1,167,269 Incurred losses and LAE 351,725 509,653 671,829 1,054,846 Commission and brokerage 172,602 148,712 339,704 276,032 Other underwriting expenses 15,727 15,472 31,318 32,358 Underwriting gain (loss) $ 80,726 $ ( 69,953) $ 204,400 $ ( 195,967) Three Months Ended Six Months Ended International June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 372,861 $ 399,024 $ 772,915 $ 765,748 Net written premiums 357,917 355,309 733,422 700,464 Premiums earned $ 360,075 $ 363,795 $ 711,010 $ 707,399 Incurred losses and LAE 212,972 301,406 467,107 428,430 Commission and brokerage 88,170 92,088 169,595 174,265 Other underwriting expenses 9,835 10,349 18,516 20,925 Underwriting gain (loss) $ 49,098 $ ( 40,048) $ 55,792 $ 83,779 Three Months Ended Six Months Ended Bermuda June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 394,962 $ 369,440 $ 762,813 $ 785,126 Net written premiums 369,929 355,236 719,270 750,204 Premiums earned $ 362,905 $ 353,698 $ 693,018 $ 672,832 Incurred losses and LAE 218,385 250,097 416,344 379,610 Commission and brokerage 84,606 80,318 158,716 161,805 Other underwriting expenses 11,868 10,762 23,365 20,895 Underwriting gain (loss) $ 48,046 $ 12,521 $ 94,593 $ 110,522 Three Months Ended Six Months Ended Insurance June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 757,068 $ 645,948 $ 1,352,125 $ 1,150,923 Net written premiums 549,297 469,530 1,006,442 855,782 Premiums earned $ 473,539 $ 408,441 $ 898,717 $ 801,745 Incurred losses and LAE 311,548 280,158 587,900 535,605 Commission and brokerage 75,572 62,284 142,409 128,939 Other underwriting expenses 67,403 56,516 130,619 115,205 Underwriting gain (loss) $ 19,016 $ 9,483 $ 37,789 $ 21,996 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: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Underwriting gain (loss) $ 196,886 $ ( 87,997) $ 392,574 $ 20,330 Net investment income 179,028 141,322 320,004 279,616 Net realized capital gains (losses) 30,272 15,776 122,504 ( 9,125) Net derivative gain (loss) 353 2,987 3,584 3,260 Corporate expenses ( 7,535) ( 6,633) ( 14,187) ( 15,629) Interest, fee and bond issue cost amortization expense ( 8,434) ( 7,728) ( 16,065) ( 15,146) Other income (expense) ( 7,977) 3,036 ( 17,030) 15,100 Income (loss) before taxes $ 382,593 $ 60,763 $ 791,384 $ 278,406 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: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 United Kingdom gross written premium $ 207,140 $ 177,072 $ 470,997 $ 435,331 No other country represented more than 5% of the Company’s revenues.

Share-Based Compensation Plans

Share-Based Compensation Plans	6 Months Ended
	Jun. 30, 2019
Share-Based Compensation Plans [Abstract]
Share-Based Compensation Plans	16. SHARE-BASED COMPENSATION PLANS For the three months ended June 30, 2019, 1,916 share-based compensation awards were granted. There were 1,115 restricted shares, granted on May 15, 2019, with a fair value of $ 247.930 per share and 801 restricted shares granted on May 23, 2019, with a fair value of $ 249.830 per share.

Retirement Benefits

Retirement Benefits	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Retirement Benefits	17. RETIREMENT BENEFITS The Company maintains both qualified and non-qualified defined benefit pension plans for its U.S. employees employed prior to April 1, 2010. Generally, the Company computes the benefits based on average earnings over a period prescribed by the plans and credited length of service. The Company’s non-qualified defined benefit pension plan provided compensating pension benefits for participants whose benefits have been curtailed under the qualified plan due to Internal Revenue Code limitations. Effective January 1, 2018, participants of the Company’s non-qualified defined benefit pension plan may no longer accrue additional service benefits. Net periodic benefit cost for U.S. employees included the following components for the periods indicated: Pension Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 2,276 $ 2,977 $ 4,552 $ 5,954 Interest cost 2,930 2,585 5,860 5,170 Expected return on plan assets ( 5,016) ( 3,670) ( 10,031) ( 7,341) Amortization of net (income) loss 1,601 2,237 3,203 4,473 FAS 88 settlement charge 104 - 208 - Net periodic benefit cost $ 1,895 $ 4,129 $ 3,792 $ 8,256 Other Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 286 $ 446 $ 573 $ 893 Interest cost 295 307 590 614 Amortization of prior service cost ( 144) ( 33) ( 289) ( 66) Amortization of net (income) loss - 94 - 188 Net periodic benefit cost $ 437 $ 814 $ 874 $ 1,629 The service cost component of net periodic benefit costs is included within other underwriting expenses on the consolidated statement of operations and comprehensive income (loss). In accordance with ASU 2017-07, other staff compensation costs are also primarily recorded within this line item. The Company did no

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Taxes [Abstract]
Income Taxes	18. INCOME TAXES The Company is domiciled in Bermuda and has significant subsidiaries and/or branches in Canada, Ireland, Singapore, Switzerland, the United Kingdom, and the United States. The Company’s Bermuda domiciled subsidiaries are exempt from income taxation under Bermuda law until 2035. The Company’s non-Bermudian subsidiaries and branches are subject to income taxation at varying rates in their respective domiciles. The Company generally applies the estimated Annualized Effective Tax Rate (“AETR”) approach for calculating its tax provision for interim periods as prescribed by ASC 740-270, Interim Reporting. Under the AETR approach, the estimated annualized effective tax rate is applied to the interim year-to-date pre-tax income/loss to determine the income tax expense or benefit for the year-to-date period. If the AETR approach produces a year-to-date tax benefit which exceeds the amount which is estimated to be recoverable for the full year, then the tax benefit for the interim reporting period will be limited as prescribed under ASC 740-270 to the estimated recoverable based on the year-to-date result. The tax expense or benefit for the quarter represents the difference between the year-to-date tax expense or benefit for the current year-to-date period less such amount for the immediately preceding year-to-date period. Management considers the impact of all known events in its estimation of the Company’s annual pre-tax income/loss and annualized effective tax rate.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
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.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2019
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At June 30, 2019 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,301,006 $ 33,777 $ ( 2,578) $ 1,332,205 $ - Obligations of U.S. states and political subdivisions 502,025 27,035 ( 351) 528,709 - Corporate securities 5,892,619 161,213 ( 33,382) 6,020,450 368 Asset-backed securities 759,213 2,346 ( 1,958) 759,601 - Mortgage-backed securities Commercial 677,210 26,967 ( 927) 703,250 - Agency residential 2,294,248 28,879 ( 11,711) 2,311,416 - Non-agency residential 8,381 39 ( 15) 8,405 - Foreign government securities 1,293,568 49,162 ( 39,548) 1,303,182 - Foreign corporate securities 2,778,285 113,443 ( 54,422) 2,837,306 434 Total fixed maturity securities $ 15,506,555 $ 442,861 $ ( 144,892) $ 15,804,524 $ 802 At December 31, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,629,454 $ 16,781 $ ( 15,101) $ 2,631,134 $ - Obligations of U.S. states and political subdivisions 490,018 12,915 ( 2,839) 500,094 439 Corporate securities 5,538,582 48,465 ( 141,515) 5,445,532 1,688 Asset-backed securities 545,427 162 ( 5,492) 540,097 - Mortgage-backed securities Commercial 329,883 2,167 ( 5,340) 326,710 - Agency residential 1,832,760 7,325 ( 43,821) 1,796,264 - Non-agency residential 10,198 37 ( 26) 10,209 - Foreign government securities 1,335,328 34,743 ( 55,906) 1,314,165 98 Foreign corporate securities 2,694,922 63,994 ( 97,858) 2,661,058 320 Total fixed maturity securities $ 15,406,572 $ 186,589 $ ( 367,898) $ 15,225,263 $ 2,545 (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At June 30, 2019 At December 31, 2018 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,566,736 $ 1,579,362 $ 1,328,571 $ 1,330,534 Due after one year through five years 6,605,036 6,687,305 8,114,247 8,016,490 Due after five years through ten years 2,761,724 2,880,168 2,455,911 2,413,846 Due after ten years 834,007 875,017 789,575 791,113 Asset-backed securities 759,213 759,601 545,427 540,097 Mortgage-backed securities: Commercial 677,210 703,250 329,883 326,710 Agency residential 2,294,248 2,311,416 1,832,760 1,796,264 Non-agency residential 8,381 8,405 10,198 10,209 Total fixed maturity securities $. 15,506,555 $. 15,804,524 $. 15,406,572 $. 15,225,263
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 227,266 $ ( 40,921) $ 481,160 $ ( 260,406) Fixed maturity securities, other-than-temporary impairment ( 1,499) 456 ( 1,743) 267 Change in unrealized appreciation (depreciation), pre-tax 225,767 ( 40,465) 479,417 ( 260,139) Deferred tax benefit (expense) ( 29,954) ( 1,007) ( 52,431) 19,292 Deferred tax benefit (expense), other-than-temporary impairment 77 ( 55) 147 ( 76) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ 195,890 $ ( 41,527) $ 427,133 $ ( 240,923)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type	Duration of Unrealized Loss at June 30, 2019 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 37,959 $ ( 11) $ 352,523 $ ( 2,567) $ 390,482 $ ( 2,578) Obligations of U.S. states and political subdivisions 2,994 ( 50) 9,840 ( 301) 12,834 ( 351) Corporate securities 243,339 ( 9,044) 956,838 ( 24,338) 1,200,177 ( 33,382) Asset-backed securities 313,948 ( 1,051) 206,558 ( 907) 520,506 ( 1,958) Mortgage-backed securities Commercial 3,168 ( 35) 75,713 ( 892) 78,881 ( 927) Agency residential 38,520 ( 100) 1,068,294 ( 11,611) 1,106,814 ( 11,711) Non-agency residential 6,902 ( 15) - - 6,902 ( 15) Foreign government securities 133,946 ( 6,114) 355,728 ( 33,434) 489,674 ( 39,548) Foreign corporate securities 158,663 ( 5,387) 635,609 ( 49,035) 794,272 ( 54,422) Total fixed maturity securities $ 939,439 $ ( 21,807) $ 3,661,103 $ ( 123,085) $ 4,600,542 $ ( 144,892) Duration of Unrealized Loss at December 31, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 76,226 $ ( 158) $ 777,409 $ ( 14,943) $ 853,635 $ ( 15,101) Obligations of U.S. states and political subdivisions 71,559 ( 1,444) 38,105 ( 1,395) 109,664 ( 2,839) Corporate securities 2,513,463 ( 69,619) 1,683,729 ( 71,896) 4,197,192 ( 141,515) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities Commercial 71,167 ( 1,128) 154,201 ( 4,212) 225,368 ( 5,340) Agency residential 156,930 ( 975) 1,373,629 ( 42,846) 1,530,559 ( 43,821) Non-agency residential 10,174 ( 26) - - 10,174 ( 26) Foreign government securities 196,303 ( 9,719) 494,156 ( 46,187) 690,459 ( 55,906) Foreign corporate securities 939,808 ( 35,023) 782,405 ( 62,835) 1,722,213 ( 97,858) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity	Duration of Unrealized Loss at June 30, 2019 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 72,925 $ ( 1,270) $ 653,276 $ ( 21,829) $ 726,201 $ ( 23,099) Due in one year through five years 251,725 ( 4,989) 1,317,255 ( 64,110) 1,568,980 ( 69,099) Due in five years through ten years 223,082 ( 12,638) 216,841 ( 12,797) 439,923 ( 25,435) Due after ten years 29,169 ( 1,709) 123,166 ( 10,939) 152,335 ( 12,648) Asset-backed securities 313,948 ( 1,051) 206,558 ( 907) 520,506 ( 1,958) Mortgage-backed securities 48,590 ( 150) 1,144,007 ( 12,503) 1,192,597 ( 12,653) Total fixed maturity securities $ 939,439 $ ( 21,807) $ 3,661,103 $ ( 123,085) $ 4,600,542 $ ( 144,892) Duration of Unrealized Loss at December 31, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 454,239 $ ( 2,558) $ 427,513 $ ( 20,675) $ 881,752 $ ( 23,233) Due in one year through five years 2,014,704 ( 45,148) 2,764,981 ( 129,940) 4,779,685 ( 175,088) Due in five years through ten years 1,082,568 ( 51,300) 492,216 ( 34,210) 1,574,784 ( 85,510) Due after ten years 245,848 ( 16,957) 91,094 ( 12,431) 336,942 ( 29,388) Asset-backed securities 230,285 ( 2,746) 245,300 ( 2,746) 475,585 ( 5,492) Mortgage-backed securities 238,271 ( 2,129) 1,527,830 ( 47,058) 1,766,101 ( 49,187) Total fixed maturity securities $ 4,265,915 $ ( 120,838) $ 5,548,934 $ ( 247,060) $ 9,814,849 $ ( 367,898)
Summary Of Components Of Net Investment Income	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Fixed maturities $ 126,593 $ 114,824 $ 253,301 $ 223,506 Equity securities 4,596 6,672 8,103 13,499 Short-term investments and cash 5,393 2,092 9,598 3,824 Other invested assets Limited partnerships 48,243 21,996 56,540 45,377 Other 3,299 2,659 6,279 6,984 Gross investment income before adjustments 188,124 148,243 333,821 293,190 Funds held interest income (expense) 1,422 1,939 7,390 5,569 Future policy benefit reserve income (expense) ( 359) ( 359) ( 593) ( 568) Gross investment income 189,187 149,823 340,618 298,191 Investment expenses ( 10,159) ( 8,501) ( 20,614) ( 18,575) Net investment income $ 179,028 $ 141,322 $ 320,004 $ 279,616
Summary Of Components Of Net Realized Capital Gains (Losses)	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Fixed maturity securities, market value: Other-than-temporary impairments $ ( 5,157) $ ( 888) $ ( 8,090) $ ( 958) Gains (losses) from sales 6,097 ( 43) 11,370 10,349 Fixed maturity securities, fair value: Gains (losses) from sales 356 ( 1,068) 356 ( 1,082) Gains (losses) from fair value adjustments - 958 13 958 Equity securities, fair value: Gains (losses) from sales ( 1,315) ( 1,563) 3,733 ( 1,523) Gains (losses) from fair value adjustments 30,362 17,800 114,803 ( 17,453) Other invested assets ( 153) 581 243 584 Short-term investments gain (loss) 82 ( 1) 76 - Total net realized capital gains (losses) $ 30,272 $ 15,776 $ 122,504 $ ( 9,125)
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Proceeds from sales of fixed maturity securities $ 522,687 $ 862,150 $ 2,320,913 $ 1,226,438 Gross gains from sales 11,908 6,824 28,046 19,826 Gross losses from sales ( 5,455) ( 7,935) ( 16,320) ( 10,559) Proceeds from sales of equity securities $ 79,733 $ 376,507 $ 149,233 $ 576,382 Gross gains from sales 2,576 7,359 8,251 14,046 Gross losses from sales ( 3,891) ( 8,922) ( 4,518) ( 15,569)

Reserve For Losses, LAE And F_2

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	6 Months Ended
	Jun. 30, 2019
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	Six Months Ended June 30, (Dollars in thousands) 2019 2018 Gross reserves beginning of period $ 13,119,090 $ 11,884,321 Less reinsurance recoverables ( 1,619,641) ( 1,212,649) Net reserves beginning of period 11,499,449 10,671,672 Incurred related to: Current year 2,135,335 1,963,766 Prior years 7,845 434,725 Total incurred losses and LAE 2,143,180 2,398,491 Paid related to: Current year 374,123 490,884 Prior years 1,598,544 2,089,606 Total paid losses and LAE 1,972,667 2,580,490 Foreign exchange/translation adjustment ( 57,392) ( 67,978) Net reserves end of period 11,612,570 10,421,695 Plus reinsurance recoverables 1,636,918 1,621,639 Gross reserves end of period $ 13,249,488 $ 12,043,334 (Some amounts may not reconcile due to rounding.)

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2019
Derivatives [Abstract]
Summary Of The Fair Value Of The Equity Index Put Options	(Dollars in thousands) Derivatives not designated as Location of fair value At At hedging instruments in balance sheets June 30, 2019 December 31, 2018 Equity index put option contracts Equity index put option liability $ 8,374 $ 11,958 Total $ 8,374 $ 11,958 (Dollars in thousands) For the Three Months Ended For Six Months Ended Derivatives not designated as Location of gain (loss) in statements of June 30, June 30, hedging instruments operations and comprehensive income (loss) 2019 2018 2019 2018 Equity index put option contracts Net derivative gain (loss) $ 353 $ 2,987 $ 3,584 $ 3,260 Total $ 353 $ 2,987 $ 3,584 $ 3,260

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value [Abstract]
Fair Value Measurement Levels For All Assets And Liabilities	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) June 30, 2019 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,332,205 $ - $ 1,332,205 $ - Obligations of U.S. States and political subdivisions 528,709 - 528,709 - Corporate securities 6,020,450 - 5,477,572 542,878 Asset-backed securities 759,601 - 759,601 - Mortgage-backed securities Commercial 703,250 - 703,250 - Agency residential 2,311,416 - 2,311,416 - Non-agency residential 8,405 - 8,405 - Foreign government securities 1,303,182 - 1,303,182 - Foreign corporate securities 2,837,306 - 2,835,213 2,093 Total fixed maturities, market value 15,804,524 - 15,259,553 544,971 Fixed maturities, fair value - - - - Equity securities, fair value 914,654 834,213 80,441 - Liabilities: Equity index put option contracts $ 8,374 $ - $ - $ 8,374 Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) Decemer 31, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 2,631,134 $ - $ 2,631,134 $ - Obligations of U.S. States and political subdivisions 500,094 - 500,094 - Corporate securities 5,445,532 - 5,017,317 428,215 Asset-backed securities 540,097 - 540,097 - Mortgage-backed securities Commercial 326,710 - 326,710 - Agency residential 1,796,264 - 1,796,264 - Non-agency residential 10,209 - 10,209 - Foreign government securities 1,314,165 - 1,314,165 - Foreign corporate securities 2,661,058 - 2,653,314 7,744 Total fixed maturities, market value 15,225,263 - 14,789,304 435,959 Fixed maturities, fair value 2,337 - - 2,337 Equity securities, fair value 716,639 674,433 42,206 - Liabilities: Equity index put option contracts $ 11,958 $ - $ - $ 11,958
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	Total Fixed Maturities, Market Value Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 437,826 $ 7,298 $ 445,124 $ 428,215 $ 7,744 $ 435,959 Total gains or (losses) (realized/unrealized) Included in earnings ( 2,528) ( 238) ( 2,766) 2,330 ( 119) 2,211 Included in other comprehensive income (loss) 1,871 - 1,871 2,444 - 2,444 Purchases, issuances and settlements 101,732 ( 4,967) 96,765 108,370 ( 5,532) 102,838 Transfers in and/or (out) of Level 3 3,977 - 3,977 1,519 - 1,519 Ending balance $ 542,878 $ 2,093 $ 544,971 $ 542,878 $ 2,093 $ 544,971 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 220,555 $ 11,368 $ 231,923 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 624 ( 504) 120 1,346 ( 410) 936 Included in other comprehensive income (loss) 190 - 190 425 - 425 Purchases, issuances and settlements 159,846 1 159,847 169,258 4,323 173,581 Transfers in and/or (out) of Level 3 - 1,750 1,750 - 1,750 1,750 Ending balance $ 381,215 $ 12,615 $ 393,830 $ 381,215 $ 12,615 $ 393,830 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Far Value Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 2,350 $ 2,350 $ 2,337 $ 2,337 Total gains or (losses) (realized/unrealized) Included in earnings 356 356 369 369 Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements ( 2,706) ( 2,706) ( 2,706) ( 2,706) Transfers in and/or (out) of Level 3 - - - - Ending balance $ - $ - $ - $ - The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Far Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 1,821 $ 1,821 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings ( 142) ( 142) ( 156) ( 156) Included in other comprehensive income (loss) 32 32 32 32 Purchases, issuances and settlements 1,481 1,481 3,316 3,316 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,192 $ 3,192 $ 3,192 $ 3,192 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	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 -2018 2019 2018 Liabilities: Balance, beginning of period $ 8,727 $ 12,205 $ 11,958 $ 12,477 Total (gains) or losses (realized/unrealized) Included in earnings ( 353) ( 2,987) ( 3,584) ( 3,260) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Balance, end of period $ 8,374 $ 9,218 $ 8,374 $ 9,218 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.)

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Common Share [Abstract]
Schedule Of Net Income (Loss) Per Common Share	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands, except per share amounts) 2019 2018 2019 2018 Net income (loss) per share: Numerator Net income (loss) $ 342,855 $ 69,895 $ 691,755 $ 280,213 Less: dividends declared-common shares and nonvested common shares ( 56,999) ( 53,240) ( 114,136) ( 106,480) Undistributed earnings 285,856 16,655 577,619 173,733 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 98.9 % 282,624 16,477 571,326 171,881 Add: dividends declared-common shareholders 56,394 52,705 112,925 105,403 Numerator for basic and diluted earnings per common share $ 339,018 $ 69,183 $ 684,251 $ 277,284 Denominator Denominator for basic earnings per weighted-average common shares 40,277 40,504 40,291 40,487 Effect of dilutive securities: Options 126 206 134 213 Denominator for diluted earnings per adjusted weighted-average common shares 40,404 40,710 40,425 40,699 Per common share net income (loss) Basic $ 8.42 $ 1.71 $ 16.98 $ 6.85 Diluted $ 8.39 $ 1.70 $ 16.93 $ 6.81 (1) Basic weighted-average common shares outstanding 40,277 40,504 40,291 40,487 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,738 40,943 40,735 40,923 Percentage allocated to common shareholders 98.9 % 98.9 % 98.9 % 98.9 % (Some amounts may not reconcile due to rounding.)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At June 30, At December 31, (Dollars in thousands) 2019 2018 The Prudential $ 141,386 $ 142,754 Unaffiliated life insurance company 33,720 34,717

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2019
Other Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ 228,053 $ ( 28,872) $ 199,181 $ 484,683 $ ( 52,263) $ 432,420 URA(D) on securities - OTTI ( 1,499) 77 ( 1,422) ( 1,743) 147 ( 1,596) Reclassification of net realized losses (gains) included in net income (loss) ( 787) ( 1,082) ( 1,869) ( 3,523) ( 168) ( 3,691) Foreign currency translation adjustments ( 27,823) 1,991 ( 25,832) ( 11,225) ( 555) ( 11,780) Benefit plan actuarial net gain (loss) - - - - - - Reclassification of benefit plan liability amortization included in net income (loss) 1,457 ( 306) 1,151 2,914 ( 612) 2,302 Total other comprehensive income (loss) $ 199,401 $ ( 28,192) $ 171,209 $ 471,106 $ ( 53,451) $ 417,655 Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ ( 41,271) $ ( 906) $ ( 42,177) $ ( 250,431) $ 17,840 $ ( 232,591) URA(D) on securities - OTTI 456 ( 55) 401 267 ( 76) 191 Reclassification of net realized losses (gains) included in net income (loss) 350 ( 101) 249 ( 9,975) 1,452 ( 8,523) Foreign currency translation adjustments ( 69,202) 5,550 ( 63,652) ( 51,857) 5,904 ( 45,953) Reclassification of benefit plan liability amortization included in net income (loss) 2,297 ( 482) 1,815 4,595 ( 965) 3,630 Total other comprehensive income (loss) $ ( 107,370) $ 4,006 $ ( 103,364) $ ( 307,401) $ 24,155 $ ( 283,246)
Reclassification From Accumulated Other Comprehensive Income	Three Months Ended Six Months Ended June 30, June 30, Affected line item within the statements of AOCI component 2019 2018 2019 2018 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 787) $ 350 $ ( 3,523) $ ( 9,975) Other net realized capital gains (losses) ( 1,082) ( 101) ( 168) 1,452 Income tax expense (benefit) $ ( 1,869) $ 249 $ ( 3,691) $ ( 8,523) Net income (loss) Benefit plan net gain (loss) $ 1,457 $ 2,297 $ 2,914 $ 4,595 Other underwriting expenses ( 306) ( 482) ( 612) ( 965) Income tax expense (benefit) $ 1,151 $ 1,815 $ 2,302 $ 3,630 Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Beginning balance of URA (D) on securities $ 51,851 $ ( 150,628) $ ( 179,392) $ 49,969 Change to beginning balance due to adoption of ASU 2016-01 - - - ( 1,201) Current period change in URA (D) of investments - temporary 197,312 ( 41,928) 428,729 ( 241,114) Current period change in URA (D) of investments - non-credit OTTI ( 1,422) 401 ( 1,596) 191 Ending balance of URA (D) on securities 247,741 ( 192,155) 247,741 ( 192,155) Beginning balance of foreign currency translation adjustments ( 201,695) ( 121,232) ( 215,747) ( 138,931) Current period change in foreign currency translation adjustments ( 25,832) ( 63,652) ( 11,780) ( 45,953) Ending balance of foreign currency translation adjustments ( 227,527) ( 184,884) ( 227,527) ( 184,884) Beginning balance of benefit plan net gain (loss) ( 66,267) ( 70,114) ( 67,418) ( 71,929) Current period change in benefit plan net gain (loss) 1,151 1,815 2,302 3,630 Ending balance of benefit plan net gain (loss) ( 65,116) ( 68,299) ( 65,116) ( 68,299) Ending balance of accumulated other comprehensive income (loss) $ ( 44,902) $ ( 445,338) $ ( 44,902) $ ( 445,338) (Some amounts may not reconcile due to rounding.)

Credit Facilities (Tables)

Credit Facilities (Tables)	6 Months Ended
	Jun. 30, 2019
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Credit facility interest and fees incurred $ 105 $ 105 $ 210 $ 210
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 June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 597,058 12/31/2019 600,000 558,818 12/31/2019 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 597,058 $ 800,000 $ 558,818
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 3,672 11/24/2019 $ 200,000 $ 3,482 02/28/2019 72,488 12/31/2019 3,672 11/24/2019 3,482 02/29/2020 72,443 12/31/2019 289 08/15/2020 296 08/15/2020 173 12/16/2020 177 12/16/2020 122 12/20/2020 125 12/20/2020 2,989 12/31/2020 1,851 11/04/2022 40,876 06/30/2023 407 11/13/2022 - 59,293 12/30/2022 Total Citibank Bilateral Agreement $ 200,000 $ 124,091 $ 200,000 $ 141,746
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 June 30, 2019 At December 31, 2018 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 30,000 £ 24,845 12/31/2022 £ 30,000 £ 26,000 12/31/2022 - - - - Total Lloyd's Bank Credit Facility £ 30,000 £ 24,845 £ 30,000 £ 26,000

Collateralized Reinsurance An_2

Collateralized Reinsurance And Trust Agreements (Tables)	6 Months Ended
	Jun. 30, 2019
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Three Months Ended Six Months Ended June 30, June 30, Mt. Logan Re Segregated Accounts 2019 2018 2019 2018 (Dollars in thousands) Ceded written premiums 58,887 46,641 140,450 130,430 Ceded earned premiums 74,315 65,957 140,640 126,838 Ceded losses and LAE 39,366 135,299 85,415 160,523 Assumed written premiums 2,724 1,604 5,033 4,647 Assumed earned premiums 2,724 1,604 5,033 4,647 Assumed losses and LAE - - - -

Senior Notes (Tables)

Senior Notes (Tables)	6 Months Ended
	Jun. 30, 2019
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	June 30, 2019 December 31, 2018 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value Senior notes 06-05-2014 06-01-2044 400,000 $ 397,014 $ 429,048 $ 396,954 $ 396,968
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended Six Months Ended June 30, June 30, (Dollars In thousands 2019 2018 2019 2018 Interest expense incurred $ ( 4,868) $ 4,868 $ 9,736 $ 9,736

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	6 Months Ended
	Jun. 30, 2019
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date June 30, 2019 December 31, 2018 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value Long term subordinated notes 04-26-2007 $ 400,000 05-15-2037 05-01-2067 $ 236,709 $ 211,125 $ 236,659 $ 200,390
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Interest expense incurred $ 3,406 $ 2,702 $ 6,011 $ 5,093

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Supplemental Information Relating to Operating Leases	Three Months Ended Six Months Ended (Dollars in thousands) June 30, June 30, Lease expense incurred: 2019 2019 Operating lease cost $ 6,031 $ 11,218 At June 30, (Dollars in thousands) 2019 Operating lease right of use assets $ 62,468 Operating lease liabilities 69,191 Six Months Ended June 30, (Dollars in thousands) 2019 Operating cash flows from operating leases $ ( 8,926) At June 30, 2019 Weighted average remaining operating lease term 5.9 years Weighted average discount rate on operating leases 4.48 %
Maturities of Lease Liabilities	(Dollars in thousands) Remainder of 2019 $ 9,459 2020 18,653 2021 9,823 2022 9,543 2023 9,291 2024 9,000 Thereafter 20,424 Undiscounted lease payments 86,193 Less: present value adjustment 17,002 Total operating lease liability $ 69,191

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended Six Months Ended U.S. Reinsurance June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 641,764 $ 652,109 $ 1,405,910 $ 1,296,331 Net written premiums 506,840 566,303 1,176,547 1,112,134 Premiums earned $ 620,780 $ 603,884 $ 1,247,251 $ 1,167,269 Incurred losses and LAE 351,725 509,653 671,829 1,054,846 Commission and brokerage 172,602 148,712 339,704 276,032 Other underwriting expenses 15,727 15,472 31,318 32,358 Underwriting gain (loss) $ 80,726 $ ( 69,953) $ 204,400 $ ( 195,967) Three Months Ended Six Months Ended International June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 372,861 $ 399,024 $ 772,915 $ 765,748 Net written premiums 357,917 355,309 733,422 700,464 Premiums earned $ 360,075 $ 363,795 $ 711,010 $ 707,399 Incurred losses and LAE 212,972 301,406 467,107 428,430 Commission and brokerage 88,170 92,088 169,595 174,265 Other underwriting expenses 9,835 10,349 18,516 20,925 Underwriting gain (loss) $ 49,098 $ ( 40,048) $ 55,792 $ 83,779 Three Months Ended Six Months Ended Bermuda June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 394,962 $ 369,440 $ 762,813 $ 785,126 Net written premiums 369,929 355,236 719,270 750,204 Premiums earned $ 362,905 $ 353,698 $ 693,018 $ 672,832 Incurred losses and LAE 218,385 250,097 416,344 379,610 Commission and brokerage 84,606 80,318 158,716 161,805 Other underwriting expenses 11,868 10,762 23,365 20,895 Underwriting gain (loss) $ 48,046 $ 12,521 $ 94,593 $ 110,522 Three Months Ended Six Months Ended Insurance June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Gross written premiums $ 757,068 $ 645,948 $ 1,352,125 $ 1,150,923 Net written premiums 549,297 469,530 1,006,442 855,782 Premiums earned $ 473,539 $ 408,441 $ 898,717 $ 801,745 Incurred losses and LAE 311,548 280,158 587,900 535,605 Commission and brokerage 75,572 62,284 142,409 128,939 Other underwriting expenses 67,403 56,516 130,619 115,205 Underwriting gain (loss) $ 19,016 $ 9,483 $ 37,789 $ 21,996
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Underwriting gain (loss) $ 196,886 $ ( 87,997) $ 392,574 $ 20,330 Net investment income 179,028 141,322 320,004 279,616 Net realized capital gains (losses) 30,272 15,776 122,504 ( 9,125) Net derivative gain (loss) 353 2,987 3,584 3,260 Corporate expenses ( 7,535) ( 6,633) ( 14,187) ( 15,629) Interest, fee and bond issue cost amortization expense ( 8,434) ( 7,728) ( 16,065) ( 15,146) Other income (expense) ( 7,977) 3,036 ( 17,030) 15,100 Income (loss) before taxes $ 382,593 $ 60,763 $ 791,384 $ 278,406
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 United Kingdom gross written premium $ 207,140 $ 177,072 $ 470,997 $ 435,331

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2019
Defined Benefit Pension Plan [Member]
Net Periodic Benefit Cost For U.S. Employees	Pension Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 2,276 $ 2,977 $ 4,552 $ 5,954 Interest cost 2,930 2,585 5,860 5,170 Expected return on plan assets ( 5,016) ( 3,670) ( 10,031) ( 7,341) Amortization of net (income) loss 1,601 2,237 3,203 4,473 FAS 88 settlement charge 104 - 208 - Net periodic benefit cost $ 1,895 $ 4,129 $ 3,792 $ 8,256
Post-Retirement Plan [Member]
Net Periodic Benefit Cost For U.S. Employees	Other Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 286 $ 446 $ 573 $ 893 Interest cost 295 307 590 614 Amortization of prior service cost ( 144) ( 33) ( 289) ( 66) Amortization of net (income) loss - 94 - 188 Net periodic benefit cost $ 437 $ 814 $ 874 $ 1,629

Basis Of Presentation (Details)

Basis Of Presentation (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jan. 01, 2019
Basis Of Presentation [Abstract]
U.S. tax rate	35.00%	21.00%
Reclass due to early adoption of Accounting Standards Update 2018-02			$ 1,250,000
Cumulative change due to ASU			$ (1,201,000)		$ 0
Operating lease right of use assets				$ 62,468,000	69,869,000
Operating lease liabilities				$ 69,191,000	$ 77,270,000

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value		80.00%
Aggregate market value of investments in unrealized loss position		$ 4,600,542,000	$ 9,814,849,000
Gross unrealized losses on investments in unrealized loss position		144,892,000	367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		21,807,000	120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		123,085,000	247,060,000
Gross unrealized depreciation		0
Additional contractual commitments		$ 823,622,000
Contractual commitments, investment period expiration date		Jan. 1, 2023
Reclassification of other invested assets to fixed maturity securities	$ 143,656,000
Reclassification of other invested assets to short-term investments	$ 243,864,000
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position		$ 4,600,542,000	9,814,849,000
Gross unrealized losses on investments in unrealized loss position		144,892,000	367,898,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation		21,807,000	120,838,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		123,085,000	$ 247,060,000
Market value of investments		$ 15,804,524,000		$ 15,225,263,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value			1.00%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value			5.70%
Percentage threshold of unrealized losses not exceeded by any one single issuer		0.90%
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		$ 12,934,000	$ 74,729,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation		106,852,000	230,560,000
Sub-prime and Alt-A Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized depreciation		0	$ 0
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Market value of investments		$ 717,083,000

Investments (Summary Of Unreali

Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 15,506,555
Unrealized Appreciation	442,861
Unrealized Depreciation	(144,892)
OTTI in AOCI	802
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,506,555	$ 15,406,572
Unrealized Appreciation	442,861	186,589
Unrealized Depreciation	(144,892)	(367,898)
Market Value	15,804,524	15,225,263
OTTI in AOCI	802	2,545
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,301,006	2,629,454
Unrealized Appreciation	33,777	16,781
Unrealized Depreciation	(2,578)	(15,101)
Market Value	1,332,205	2,631,134
OTTI in AOCI	0
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	502,025	490,018
Unrealized Appreciation	27,035	12,915
Unrealized Depreciation	(351)	(2,839)
Market Value	528,709	500,094
OTTI in AOCI	0	439
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,892,619	5,538,582
Unrealized Appreciation	161,213	48,465
Unrealized Depreciation	(33,382)	(141,515)
Market Value	6,020,450	5,445,532
OTTI in AOCI	368	1,688
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	759,213	545,427
Unrealized Appreciation	2,346	162
Unrealized Depreciation	(1,958)	(5,492)
Market Value	759,601	540,097
OTTI in AOCI	0
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	677,210	329,883
Unrealized Appreciation	26,967	2,167
Unrealized Depreciation	(927)	(5,340)
Market Value	703,250	326,710
OTTI in AOCI	0
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,294,248	1,832,760
Unrealized Appreciation	28,879	7,325
Unrealized Depreciation	(11,711)	(43,821)
Market Value	2,311,416	1,796,264
OTTI in AOCI	0
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,381	10,198
Unrealized Appreciation	39	37
Unrealized Depreciation	(15)	(26)
Market Value	8,405	10,209
OTTI in AOCI	0
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,293,568	1,335,328
Unrealized Appreciation	49,162	34,743
Unrealized Depreciation	(39,548)	(55,906)
Market Value	1,303,182	1,314,165
OTTI in AOCI	0	98
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,778,285	2,694,922
Unrealized Appreciation	113,443	63,994
Unrealized Depreciation	(54,422)	(97,858)
Market Value	2,837,306	2,661,058
OTTI in AOCI	$ 434	$ 320

Investments (Summary Of Amortiz

Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 15,506,555	$ 15,406,572
Fixed maturity securities - available for sale, Market Value	15,804,524	15,225,263
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,566,736	1,328,571
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,605,036	8,114,247
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	2,761,724	2,455,911
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	834,007	789,575
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,579,362	1,330,534
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,687,305	8,016,490
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,880,168	2,413,846
Fixed maturity securities - available for sale, Due after ten years, Market Value	875,017	791,113
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	759,213	545,427
Fixed maturity securities - available for sale, Market Value	759,601	540,097
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	677,210	329,883
Fixed maturity securities - available for sale, Market Value	703,250	326,710
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,294,248	1,832,760
Fixed maturity securities - available for sale, Market Value	2,311,416	1,796,264
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	8,381	10,198
Fixed maturity securities - available for sale, Market Value	$ 8,405	$ 10,209

Investments (Summary Of Changes

Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 225,767	$ (40,465)	$ 479,417	$ (260,139)
Deferred tax benefit (expense)	(29,954)	(1,007)	(52,431)	19,292
Deferred tax benefit (expense), other-than-temporary impairment	77	(55)	147	(76)
Total URA(D) on securities arising during the period	195,890	(41,527)	427,133	(240,923)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	227,266	(40,921)	481,160	(260,406)
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (1,499)	$ 456	$ (1,743)	$ 267

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	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	$ (21,807)	$ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(367,898)
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	939,439	4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(21,807)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,661,103	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(367,898)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	37,959	76,226
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(11)	(158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	352,523	777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,567)	(14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	390,482	853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,578)	(15,101)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	2,994	71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(50)	(1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	9,840	38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(301)	(1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	12,834	109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(351)	(2,839)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	243,339	2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(9,044)	(69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	956,838	1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(24,338)	(71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,200,177	4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(33,382)	(141,515)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	313,948	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,051)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	206,558	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(907)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	520,506	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,958)	(5,492)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	3,168	71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(35)	(1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	75,713	154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(892)	(4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	78,881	225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(927)	(5,340)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	38,520	156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(100)	(975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,068,294	1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,611)	(42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,106,814	1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(11,711)	(43,821)
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	6,902	10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(15)	(26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	0
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	0
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	6,902	10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(15)	(26)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	133,946	196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(6,114)	(9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	355,728	494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(33,434)	(46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	489,674	690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(39,548)	(55,906)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	158,663	939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(5,387)	(35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	635,609	782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(49,035)	(62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	794,272	1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (54,422)	$ (97,858)

Investments (Summary Of Aggre_2

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	$ (21,807)	$ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(367,898)
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	939,439	4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(21,807)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,661,103	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(367,898)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	72,925	454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,270)	(2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	653,276	427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(21,829)	(20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	726,201	881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(23,099)	(23,233)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	251,725	2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(4,989)	(45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,317,255	2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(64,110)	(129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,568,980	4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(69,099)	(175,088)
Due In Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	223,082	1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(12,638)	(51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	216,841	492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12,797)	(34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	439,923	1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(25,435)	(85,510)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	29,169	245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,709)	(16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	123,166	91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(10,939)	(12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	152,335	336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(12,648)	(29,388)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	313,948	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,051)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	206,558	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(907)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	520,506	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,958)	(5,492)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	48,590	238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(150)	(2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,144,007	1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12,503)	(47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,192,597	1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (12,653)	$ (49,187)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 188,124	$ 148,243	$ 333,821	$ 293,190
Funds held interest income (expense)	1,422	1,939	7,390	5,569
Future policy benefit reserve income (expense)	(359)	(359)	(593)	(568)
Gross investment income	189,187	149,823	340,618	298,191
Investment expenses	(10,159)	(8,501)	(20,614)	(18,575)
Net investment income	179,028	141,322	320,004	279,616
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	126,593	114,824	253,301	223,506
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	4,596	6,672	8,103	13,499
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	5,393	2,092	9,598	3,824
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	48,243	21,996	56,540	45,377
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 3,299	$ 2,659	$ 6,279	$ 6,984

Investments (Summary Of Compo_2

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ 5,157	$ 888	$ 8,090	$ 958
Total net realized capital gains (losses)	30,272	15,776	122,504	(9,125)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	5,157	888	8,090	958
Gains (losses) from sales	6,097	(43)	11,370	10,349
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	356	(1,068)	356	(1,082)
Gains (losses) from fair value adjustments	0	958	13	958
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,315)	(1,563)	3,733	(1,523)
Gains (losses) from fair value adjustments	30,362	17,800	114,803	(17,453)
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(153)	581	243	584
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ 82	$ (1)	$ 76	$ 0

Investments (Summary Of Gross G

Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 522,687	$ 862,150	$ 2,320,913	$ 1,226,438
Gross gains from sales	11,908	6,824	28,046	19,826
Gross losses from sales	(5,455)	(7,935)	(16,320)	(10,559)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	79,733	376,507	149,233	576,382
Gross gains from sales	2,576	7,359	8,251	14,046
Gross losses from sales	$ (3,891)	$ (8,922)	$ (4,518)	$ (15,569)

Reserve For Losses, LAE And F_3

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business	$ 7,845	$ 434,725
Partial offset, related to favorable development on reserves	$ 97,430
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business		$ 532,155

Reserve For Losses, LAE And F_4

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves beginning of period	$ 13,119,090	$ 11,884,321
Less reinsurance recoverables	(1,619,641)	(1,212,649)
Net reserves beginning of period	11,499,449	10,671,672
Incurred related to: Current year	2,135,335	1,963,766
Incurred related to: Prior years	7,845	434,725
Total incurred losses and LAE	2,143,180	2,398,491
Paid related to: Current year	374,123	490,884
Paid related to: Prior years	1,598,544	2,089,606
Total paid losses and LAE	1,972,667	2,580,490
Foreign exchange/translation adjustment	(57,392)	(67,978)
Net reserves end of period	11,612,570	10,421,695
Plus reinsurance recoverables	1,636,918	1,621,639
Gross reserves end ofperiod	$ 13,249,488	$ 12,043,334

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details)	6 Months Ended	60 Months Ended
	Jun. 30, 2019USD ($)GBP (£)Item	Dec. 31, 2005Item	Dec. 31, 2018USD ($)	Dec. 31, 2001Item
Derivative [Line Items]
Number of equity index put option contracts | Item		7		7
Number of equity indices | Item		2
Equity index put option liability	$ 8,374,000		$ 11,958,000
Equity Index Put Option Contracts [Member]
Derivative [Line Items]
Derivative expiration date	Jun. 9, 2017
Equity index put option liability	$ 0
Equity Index Put Option Contracts [Member] | Fair Value [Member]
Derivative [Line Items]
Equity index put option liability	$ 8,374,000		$ 11,958,000
Equity Index Put Option Contract, Expired On July 1, 2019 [Member]
Derivative [Line Items]
Number of equity index put option contracts | Item	1
Present value of theoretical maximum payouts	$ 80,993,000
Equity Index Put Option Contract, Expired Prior To June 30, 2019 [Member]
Derivative [Line Items]
Number of equity index put option contracts | Item	2
Standard & Poor's 500 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | Item	4
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 353,283,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired	2,941.76
Standard & Poor's 500 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	1.00%
FTSE 100 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | Item	1
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 40,113,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired | £	7,425.63
FTSE 100 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	9.00%

Derivatives (Summary Of The Fai

Derivatives (Summary Of The Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 8,374		$ 8,374		$ 11,958
Net derivative gain (loss)	353	$ 2,987	3,584	$ 3,260
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	8,374		8,374		$ 11,958
Net derivative gain (loss)	$ 353	$ 2,987	$ 3,584	$ 3,260

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio	$ 155,784,000		$ 155,784,000		$ 124,228,000
Other invested assets	453,067,000		453,067,000		358,042,000
Transfers between level 1 and 2	0		0
Transfers from level 3	3,977,000		1,519,000
Accounting Standards Update 2015-07 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	154,908,000		154,908,000		117,662,000
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from level 3	3,977,000	$ 1,750,000	1,519,000	$ 1,750,000
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from level 3	0	$ 0	0	$ 0
Fixed Maturities [Member] | Non-Binding Broker Quote [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities					1,153,000
Fixed Maturities [Member] | Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	544,971,000		544,971,000		435,959,000
Fixed Maturities [Member] | Market Value [Member] | Investment Manager's Valuation Committee Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	412,095,000		412,095,000		354,143,000
Fixed Maturities [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities					2,337,000
Fixed Maturities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Amortized Cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities	$ 132,876,000		$ 132,876,000
Fixed Maturities [Member] | Fair Value [Member] | Investment Manager's Valuation Committee Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities					2,337,000
Fixed Maturities [Member] | Par Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities					$ 80,663,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 15,804,524	$ 15,225,263
Fixed maturities, fair value	0	2,337
Equity securities, fair value	914,654	716,639
Equity index put option contracts	8,374	11,958
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value	0	0
Equity securities, fair value	834,213	674,433
Equity index put option contracts	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value	0	0
Equity securities, fair value	80,441	42,206
Equity index put option contracts	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value	0	2,337
Equity securities, fair value	0	0
Equity index put option contracts	8,374	11,958
Fixed Maturity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	15,804,524	15,225,263
Fixed Maturity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Fixed Maturity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	15,259,553	14,789,304
Fixed Maturity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	544,971	435,959
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,332,205	2,631,134
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	1,332,205	2,631,134
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Obligations Of U.S. States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	528,709	500,094
Obligations Of U.S. States And Political Subdivisions [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	528,709	500,094
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	6,020,450	5,445,532
Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	5,477,572	5,017,317
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	542,878	428,215
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	759,601	540,097
Asset-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	759,601	540,097
Asset-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Commercial Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	703,250	326,710
Commercial Mortgage-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	703,250	326,710
Commercial Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,311,416	1,796,264
Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,311,416	1,796,264
Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Non-Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	8,405	10,209
Non-Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	8,405	10,209
Non-Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Foreign Government Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,303,182	1,314,165
Foreign Government Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	1,303,182	1,314,165
Foreign Government Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
Foreign Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,837,306	2,661,058
Foreign Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	0	0
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	2,835,213	2,653,314
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 2,093	$ 7,744

Fair Value (Activity Under Leve

Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers in and/or (out) of Level 3	$ 3,977		$ 1,519
Market Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	445,124	$ 231,923	435,959	$ 217,138
Total gains or (losses) (realized/unrealized) Included in earnings	(2,766)	120	2,211	936
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	1,871	190	2,444	425
Purchases, issuances and settlements	96,765	159,847	102,838	173,581
Transfers in and/or (out) of Level 3	3,977	1,750	1,519	1,750
Ending balance	544,971	393,830	544,971	393,830
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	0	0	0	0
Market Value [Member] | Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	437,826	220,555	428,215	210,186
Total gains or (losses) (realized/unrealized) Included in earnings	(2,528)	624	2,330	1,346
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	1,871	190	2,444	425
Purchases, issuances and settlements	101,732	159,846	108,370	169,258
Transfers in and/or (out) of Level 3	3,977	0	1,519	0
Ending balance	542,878	381,215	542,878	381,215
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	0	0	0	0
Market Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	7,298	11,368	7,744	6,952
Total gains or (losses) (realized/unrealized) Included in earnings	(238)	(504)	(119)	(410)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	0	0	0	0
Purchases, issuances and settlements	(4,967)	1	(5,532)	4,323
Transfers in and/or (out) of Level 3	0	1,750	0	1,750
Ending balance	2,093	12,615	2,093	12,615
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	0	0	0	0
Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	2,350	1,821	2,337	0
Total gains or (losses) (realized/unrealized) Included in earnings	356	(142)	369	(156)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	0	32	0	32
Purchases, issuances and settlements	(2,706)	1,481	(2,706)	3,316
Transfers in and/or (out) of Level 3	0	0	0	0
Ending balance	0	3,192	0	3,192
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	0	0	0	0
Fair Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	2,350	1,821	2,337	0
Total gains or (losses) (realized/unrealized) Included in earnings	356	(142)	369	(156)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	0	32	0	32
Purchases, issuances and settlements	(2,706)	1,481	(2,706)	3,316
Transfers in and/or (out) of Level 3	0	0	0	0
Ending balance	0	3,192	0	3,192
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	$ 0	$ 0	$ 0	$ 0

Fair Value (Fair Value Measur_2

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value [Abstract]
Balance, beginning of period	$ 8,727	$ 12,205	$ 11,958	$ 12,477
Total (gains) or losses (realized/unrealized) Included in earnings	(353)	(2,987)	(3,584)	(3,260)
Balance, end of period	$ 8,374	$ 9,218	$ 8,374	$ 9,218

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Anti-dilutive options	0	0	0	0
Minimum [Member]
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Options expiration date			February 24, 2020
Maximum [Member]
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Options expiration date			September 19, 2022

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Common Share [Abstract]
Net income (loss)	$ 342,855	$ 69,895	$ 691,755	$ 280,213
Less: dividends declared-common shares and nonvested common shares	(56,999)	(53,240)	(114,136)	(106,480)
Undistributed earnings	$ 285,856	$ 16,655	$ 577,619	$ 173,733
Percentage allocated to common shareholders	98.90%	98.90%	98.90%	98.90%
Net income (loss) available to common stockholders, total	$ 282,624	$ 16,477	$ 571,326	$ 171,881
Add: dividends declared-common shareholders	56,394	52,705	112,925	105,403
Numerator for basic and diluted earnings per common share	$ 339,018	$ 69,183	$ 684,251	$ 277,284
Denominator for basic earnings per weighted-average common shares	40,277,000	40,504,000	40,291,000	40,487,000
Effect of dilutive securities: Options	126,000	206,000	134,000	213,000
Denominator for diluted earnings per adjusted weighted-average common shares	40,404,000	40,710,000	40,425,000	40,699,000
Basic	$ 8.42	$ 1.71	$ 16.98	$ 6.85
Diluted	$ 8.39	$ 1.70	$ 16.93	$ 6.81
Basic weighted-average common shares outstanding	40,277,000	40,504,000	40,291	40,487,000
Basic weighted-average common shares outstanding and nonvested common shares expected to vest	40,738,000	40,943,000	40,735	40,923,000

Commitments And Contingencies_2

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 141,386	$ 142,754
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 33,720	$ 34,717

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 199,401	$ (107,370)	$ 471,106	$ (307,401)
Total, Tax Effect	(28,192)	4,006	(53,451)	24,155
Total, Net of Tax	171,209	(103,364)	417,655	(283,246)
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	228,053	(41,271)	484,683	(250,431)
Tax Effect	(28,872)	(906)	(52,263)	17,840
Net of Tax	199,181	(42,177)	432,420	(232,591)
Reclassification, Before Tax	(787)	350		(9,975)
Reclassification, Tax Effect	1,082	(101)		1,452
Reclassification, Net of Tax	(1,869)	249		(8,523)
Total, Net of Tax	197,312	(41,928)	428,729	(241,114)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(1,499)	456	(1,743)	267
Tax Effect	77	(55)	147	(76)
Net of Tax	(1,422)	401	(1,596)	191
Reclassification, Before Tax			(3,523)
Reclassification, Tax Effect			(168)
Reclassification, Net of Tax			(3,691)
Total, Net of Tax	(1,422)	401	(1,596)	191
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(27,823)	(69,202)	(11,225)	(51,857)
Tax Effect	1,991	5,550	(555)	5,904
Net of Tax	(25,832)	(63,652)	(11,780)	(45,953)
Total, Net of Tax	(25,832)	(63,652)	(11,780)	(45,953)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	0		0
Tax Effect	0		0
Net of Tax	0		0
Reclassification, Before Tax	1,457	2,297	2,914	4,595
Reclassification, Tax Effect	(306)	(482)	(612)	(965)
Reclassification, Net of Tax	1,151	1,815	2,302	3,630
Total, Net of Tax	$ 1,151	$ 1,815	$ 2,302	$ 3,630

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ (39,738)	$ 9,132	$ (99,629)	$ 1,807
NET INCOME (LOSS)	342,855	69,895	691,755	280,213
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	(787)	350	(3,523)	(9,975)
Income tax expense (benefit)	(1,082)	(101)	(168)	1,452
NET INCOME (LOSS)	(1,869)	249	(3,691)	(8,523)
Benefit Plan Net Actuarial Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	1,457	2,297	2,914	4,595
Income tax expense (benefit)	(306)	(482)	(612)	(965)
NET INCOME (LOSS)	$ 1,151	$ 1,815	$ 2,302	$ 3,630

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period		$ 7,903,804,000			$ 7,903,804,000
Current period change	$ 171,209,000		$ (103,364,000)		417,655,000	$ (283,246,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01							$ 0		$ 1,201,000
Balance, end of period	8,884,160,000		8,241,349,000		8,884,160,000	8,241,349,000
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	51,851,000	(179,392,000)	(150,628,000)	$ 49,969,000	(179,392,000)	49,969,000
Current period change	197,312,000		(41,928,000)		428,729,000	(241,114,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01		0		0				$ 0	(1,201,000)
Balance, end of period	247,741,000	51,851,000	(192,155,000)	(150,628,000)	247,741,000	(192,155,000)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(1,422,000)		401,000		(1,596,000)	191,000
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(201,695,000)	(215,747,000)	(121,232,000)	(138,931,000)	(215,747,000)	(138,931,000)
Current period change	(25,832,000)		(63,652,000)		(11,780,000)	(45,953,000)
Balance, end of period	(227,527,000)	(201,695,000)	(184,884,000)	(121,232,000)	(227,527,000)	(184,884,000)
Benefit Plan Net Actuarial Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(66,267,000)	(67,418,000)	(70,114,000)	(71,929,000)	(67,418,000)	(71,929,000)
Current period change	1,151,000		1,815,000		2,302,000	3,630,000
Balance, end of period	(65,116,000)	(66,267,000)	(68,299,000)	(70,114,000)	(65,116,000)	(68,299,000)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(216,111,000)		(341,974,000)	(160,891,000)		(160,891,000)
Current period change	171,209,000	246,446,000	(103,364,000)	(179,882,000)
Change to beginning balance due to adoption of Accounting Standards Update 2016-01								$ 0	$ (1,201,000)
Balance, end of period	$ (44,902,000)	$ (216,111,000)	$ (445,338,000)	$ (341,974,000)	$ (44,902,000)	$ (445,338,000)

Credit Facilities (Narrative) (

Credit Facilities (Narrative) (Details)	May 26, 2019	Jun. 22, 2012USD ($)	Jun. 30, 2019GBP (£)Item	Dec. 31, 2005	Jun. 30, 2019USD ($)	Dec. 31, 2018GBP (£)	Dec. 31, 2018USD ($)	May 26, 2016USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | Item			2
Line of credit facility, commitment			£ 30,000,000		$ 1,000,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment		$ 800,000,000			$ 800,000,000		$ 800,000,000	$ 800,000,000
Line of credit facility, term of credit facility	5 years	4 years
Line of credit facility, required minimum debt-to-capital ratio			0.0035		0.0035
Line of credit facility, required minimum net worth					$ 5,370,979,000
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants			2500.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants			2500.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants					6,170,284,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment					200,000,000		200,000,000
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis			0.50%
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis			1.00%
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment					600,000,000		600,000,000
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment					$ 200,000,000		$ 200,000,000
Percentage of interest on the principal amount of letters of credit issued			0.35%
Percentage of interest on the principal amount of issued extended tenor letters of credit			0.45%
Maximum term allowed to execute issued letters of credit			60 months
Per annum commitment fee on undrawn credit			0.15%
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment | £			£ 30,000,000			£ 30,000,000
Line of credit facility, term of credit facility			4 years
Line of credit facility, required minimum debt-to-capital ratio			0.0035		0.0035
Line of credit facility, required minimum net worth					$ 5,326,009,000
Consolidated net worth, percentage				70.00%
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants			25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants			25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants					$ 6,161,032,000
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	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Credit Facilities [Abstract]
Credit facility interest and fees incurred	$ 105	$ 105	$ 210	$ 210

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2019GBP (£)	Dec. 31, 2018GBP (£)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	May 26, 2016USD ($)	Jun. 22, 2012USD ($)
Line of Credit Facility [Line Items]
Commitment	£ 30,000,000		$ 1,000,000,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	$ 200,000,000
In Use			0	0
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000	600,000,000
In Use			597,058,000	558,818,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000,000	800,000,000	$ 800,000,000	$ 800,000,000
In Use			597,058,000	558,818,000
Date of Expiry	Dec. 31, 2019	Dec. 31, 2019
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	200,000,000
In Use			3,672,000	3,482,000
Date of Expiry	Nov. 24, 2019	Feb. 28, 2019
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			72,488,000	3,672,000
Date of Expiry	Dec. 31, 2019	Nov. 24, 2019
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			3,482,000	72,443,000
Date of Expiry	Feb. 29, 2020	Dec. 31, 2019
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			289,000	296,000
Date of Expiry	Aug. 15, 2020	Aug. 15, 2020
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			173,000	177,000
Date of Expiry	Dec. 16, 2020	Dec. 16, 2020
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			122,000	125,000
Date of Expiry	Dec. 20, 2020	Dec. 20, 2020
Citibank Bilateral Letter Of Credit Agreement Seven [Member]
Line of Credit Facility [Line Items]
In Use			2,989,000	1,851,000
Date of Expiry	Dec. 31, 2020	Nov. 4, 2022
Citibank Bilateral Letter Of Credit Agreement Eight [Member]
Line of Credit Facility [Line Items]
In Use			40,876,000	407,000
Date of Expiry	Jun. 30, 2023	Nov. 13, 2022
Citibank Bilateral Letter Of Credit Agreement Nine [Member]
Line of Credit Facility [Line Items]
In Use			0	59,293,000
Date of Expiry		Dec. 30, 2022
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	200,000,000
In Use			$ 124,091,000	$ 141,746,000
Lloyds Bank PLC [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 30,000,000	£ 30,000,000
In Use | £	£ 24,845,000	£ 26,000,000
Date of Expiry	Dec. 31, 2022	Dec. 31, 2022
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 0	£ 0
In Use | £	0	0
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	30,000,000	30,000,000
In Use | £	£ 24,845,000	£ 26,000,000

Collateralized Reinsurance An_3

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands	Apr. 30, 2018USD ($)Item	Apr. 01, 2018USD ($)	Apr. 13, 2017USD ($)Item	Dec. 01, 2015USD ($)Item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)Item	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts							$ 894,918		$ 894,918
Preferred shares							0		0		$ 0
Reinsurance coverage amount							58,887	$ 46,641	$ 140,450	$ 130,430
Catastrophe Reinsurance Agreement 3 And 4 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item			3
Catastrophe Reinsurance Agreement 3 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			$ 325,000
Catastrophe Reinsurance Agreement 4 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			50,000
Catastrophe Reinsurance Agreement 5 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			75,000
Catastrophe Reinsurance Agreement 6 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			$ 175,000
Catastrophe Reinsurance Series 2015-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount				$ 625,000
Kilimanjaro Re Limited [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item			6	2		2
Reinsurance agreements expriation date						Apr. 1, 2018
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item	4
Reinsurance contract term	4 years
Reinsurance coverage amount					$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 And 4 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | Item	2
Reinsurance contract term	5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 62,500		$ 225,000	$ 300,000		$ 250,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	200,000		400,000	$ 325,000		200,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	62,500
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	200,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount						$ 450,000
Catastrophe Reinsurance Bonds Redeemed Amount	450,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount					$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount			950,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount			$ 300,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	262,500
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	$ 262,500
Mt. Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group									100.00%
Assumed net risk exposures									$ 993,274		1,156,853
Preferred shares							$ 46,982		$ 46,982		$ 45,625
Retrocede amount		$ 269,198
Cash transferred		$ 252,000
Mt. Logan Re [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
Accident year									2002
Mt. Logan Re [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Accident year									2015
Liability retroceded									$ 319,000

Collateralized Reinsurance An_4

Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 58,887	$ 46,641	$ 140,450	$ 130,430
Ceded earned premiums	74,315	65,957	140,640	126,838
Ceded losses and LAE	39,366	135,299	85,415	160,523
Assumed written premiums	2,724	1,604	5,033	4,647
Assumed earned premiums	2,724	1,604	5,033	4,647
Assumed losses and LAE	$ 0	$ 0	$ 0	$ 0

Senior Notes (Narrative) (Detai

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

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Consolidated Balance Sheet Amount	$ 397,014,000	$ 396,954,000
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044
Principal Amounts	$ 400,000,000
Consolidated Balance Sheet Amount	397,014,000	396,954,000
Market Value	$ 429,048,000	$ 396,968,000

Senior Notes (Schedule Of Inter

Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Senior Notes [Abstract]
Interest expense incurred	$ (4,868)	$ 4,868	$ 9,736	$ 9,736

Long Term Subordinated Notes (N

Long Term Subordinated Notes (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Debt Instrument [Line Items]
Redemption date	May 1, 2047
Maximum [Member]
Debt Instrument [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption	10000.00%
Outstanding debt reduction	$ 161,441
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%
Debt instrument, maturity date	May 1, 2067
Reset quarterly interest rate	4.90%
Basis spread on variable rate	2.385%
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
Senior Notes [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years	1 year
Senior Notes [Member] | 5.4% Senior notes due 10/15/2014 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.40%
Debt instrument, maturity date	Oct. 15, 2014
Senior Notes [Member] | 4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 1, 2044

Long Term Subordinated Notes (S

Long Term Subordinated Notes (Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 236,709	$ 236,659
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Date Issued	Apr. 26, 2007
Principal Amounts	$ 400,000
Maturity Date	May 1, 2067
Consolidated balance sheet amount	$ 236,709	236,659
Market Value	$ 211,125	$ 200,390
Scheduled [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037
Final [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 1, 2067

Long Term Subordinated Notes _2

Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Long Term Subordinated Notes [Abstract]
Interest expense incurred	$ 3,406	$ 2,702	$ 6,011	$ 5,093

Leases (Narrative) (Details)

Leases (Narrative) (Details) - SubsequentEventMember $ in Thousands	Jul. 02, 2019USD ($)ft²
Lease [Line Items]
Area of property | ft²	315,000
Annual lease expense	$ 7,800
Monthly lease expense	$ 650

Leases (Supplemental Informatio

Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Lease expense incurred: Operating lease cost	$ 6,031	$ 11,218
Operating lease right of use assets	62,468	62,468	$ 69,869
Operating lease liabilities	$ 69,191	69,191	$ 77,270
Operating cash flows from operating leases		$ 8,926
Weighted average remaining operating lease term	5 years 10 months 24 days	5 years 10 months 24 days
Weighted average discount rate on operating leases	4.48%	4.48%

Leases (Maturities of Lease Lia

Leases (Maturities of Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Remainder of 2019	$ 9,459
2020	18,653
2021	9,823
2022	9,543
2023	9,291
2024	9,000
Thereafter	20,424
Undiscounted lease payments	86,193
Less: present value adjustment	17,002
Total operating lease liability	$ 69,191	$ 77,270

Leases (Maturities of Lease L_2

Leases (Maturities of Lease Liabilities) (Details) (Alt Calc) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due	$ 86,193
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	17,002
Operating Lease, Liability	$ 69,191	$ 77,270

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Premiums earned	$ 1,817,299	$ 1,729,818	$ 3,549,996	$ 3,349,245
Incurred losses and LAE	1,094,630	1,341,314	2,143,180	2,398,491
Commission and brokerage	420,950	383,402	810,424	741,041
Other underwriting expenses	104,833	93,099	203,818	189,383
Underwriting gain (loss)	196,886	(87,997)	392,574	20,330
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	641,764	652,109	1,405,910	1,296,331
Net written premiums	506,840	566,303	1,176,547	1,112,134
Premiums earned	620,780	603,884	1,247,251	1,167,269
Incurred losses and LAE	351,725	509,653	671,829	1,054,846
Commission and brokerage	172,602	148,712	339,704	276,032
Other underwriting expenses	15,727	15,472	31,318	32,358
Underwriting gain (loss)	80,726	(69,953)	204,400	(195,967)
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums	372,861	399,024	772,915	765,748
Net written premiums	357,917	355,309	733,422	700,464
Premiums earned	360,075	363,795	711,010	707,399
Incurred losses and LAE	212,972	301,406	467,107	428,430
Commission and brokerage	88,170	92,088	169,595	174,265
Other underwriting expenses	9,835	10,349	18,516	20,925
Underwriting gain (loss)	49,098	(40,048)	55,792	83,779
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums	394,962	369,440	762,813	785,126
Net written premiums	369,929	355,236	719,270	750,204
Premiums earned	362,905	353,698	693,018	672,832
Incurred losses and LAE	218,385	250,097	416,344	379,610
Commission and brokerage	84,606	80,318	158,716	161,805
Other underwriting expenses	11,868	10,762	23,365	20,895
Underwriting gain (loss)	48,046	12,521	94,593	110,522
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	757,068	645,948	1,352,125	1,150,923
Net written premiums	549,297	469,530	1,006,442	855,782
Premiums earned	473,539	408,441	898,717	801,745
Incurred losses and LAE	311,548	280,158	587,900	535,605
Commission and brokerage	75,572	62,284	142,409	128,939
Other underwriting expenses	67,403	56,516	130,619	115,205
Underwriting gain (loss)	$ 19,016	$ 9,483	$ 37,789	$ 21,996

Segment Reporting (Schedule O_2

Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ 196,886	$ (87,997)	$ 392,574	$ 20,330
Net investment income	179,028	141,322	320,004	279,616
Net realized capital gains (losses)	30,272	15,776	122,504	(9,125)
Net derivative gain (loss)	353	2,987	3,584	3,260
Corporate expenses	(7,535)	(6,633)	(14,187)	(15,629)
Interest, fee and bond issue cost amortization expense	(8,434)	(7,728)	(16,065)	(15,146)
Other income (expense)	(7,977)	3,036	(17,030)	15,100
INCOME (LOSS) BEFORE TAXES	$ 382,593	$ 60,763	$ 791,384	$ 278,406

Segment Reporting (Schedule O_3

Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
United Kingdom [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 207,140	$ 177,072	$ 470,997	$ 435,331

Share-Based Compensation Plans

Share-Based Compensation Plans (Narrative) (Details)	3 Months Ended
	Jun. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, number of shares granted	1,916
Restricted Shares [Member] | May 15, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, number of shares granted	1,115
Share-based compensation awards, grant date	May 15, 2019
Share-based compensation awards, per option fair value | $ / shares	$ 247.930
Restricted Shares [Member] | May 23, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, number of shares granted	801
Share-based compensation awards, grant date	May 23, 2019
Share-based compensation awards, per option fair value | $ / shares	$ 249.830

Retirement Benefits (Narrative)

Retirement Benefits (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$ 0	$ 0	$ 0	$ 0

Retirement Benefits (Net Period

Retirement Benefits (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,276	$ 2,977	$ 4,552	$ 5,954
Interest cost	2,930	2,585	5,860	5,170
Expected return on plan assets	(5,016)	(3,670)	(10,031)	(7,341)
Amortization of net (income) loss	1,601	2,237	3,203	4,473
FAS 88 settlement charge	104	0	208	0
Net periodic benefit cost	1,895	4,129	3,792	8,256
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	286	446	573	893
Interest cost	295	307	590	614
Amortization of prior service cost	(144)	(33)	(289)	(66)
Amortization of net (income) loss	0	94	0	188
Net periodic benefit cost	$ 437	$ 814	$ 874	$ 1,629