Everest Re (EG) 10-Q 4 Nov 21 2021 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Transition Report	false
Entity File Number	1-15731
Entity Registrant Name	EVEREST RE GROUP, LTD.
Entity Incorporation State Country Code	D0
Entity Tax Identification Number	98-0365432
Entity Address Address Line 1	Seon Place – 4th Floor
Entity Address Address Line 2	141 Front Street
Entity Address Address Line 3	PO Box HM 845
Entity Address City Or Town	Hamilton
Entity Address Postal Zip Code	HM 19
Entity Address Country	BM
City Area Code	441
Local Phone Number	295-0006
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Security 12b Title	Common Shares, $0.01 par value
Trading Symbol	RE
Security Exchange Name	NYSE
Entity Common Stock Shares Outstanding		39,369,026
Amendment Flag	false
Entity Central Index Key	0001095073
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2021, $21,182,756; 2020, $19,225,067, credit allowances: 2021, $(31,980); 2020, $(1,745))	$ 21,623,119	$ 20,040,173
Equity securities, at fair value	1,523,595	1,472,236
Short-term investments (cost: 2021, $713,144 ; 2020, $1,135,088)	713,144	1,134,950
Other invested assets	2,855,372	2,012,581
Cash	1,068,441	801,651
Total investments and cash	27,783,671	25,461,591
Accrued investment income	170,364	141,304
Premiums receivable	3,408,338	2,680,562
Reinsurance recoverables	2,215,380	1,994,555
Funds held by reinsureds	811,269	716,655
Deferred acquisition costs	797,735	622,053
Prepaid reinsurance premiums	552,468	412,015
Income taxes net recoverable		17,253
Other assets	866,872	742,369
TOTAL ASSETS	36,606,097	32,788,357
LIABILITIES:
Reserve for losses and loss adjustment expenses	18,956,953	16,398,997
Future policy benefit reserve	36,533	37,723
Unearned premium reserve	4,421,098	3,501,359
Funds held under reinsurance treaties	18,279	15,807
Other net payable to reinsurers	485,682	294,347
Losses in course of payment	150,784	127,971
Long term notes due 5/1/2067	223,749	223,674
Borrowings from FHLB	310,000	310,000
Accrued interest on debt and borrowings	23,267	10,460
Unsettled securities payable	83,626	206,693
Income taxes net payable	4,074
Other liabilities	536,218	558,432
Total liabilities	26,627,462	23,062,181
Commitments and contingencies (Note 7)
SHAREHOLDERS' EQUITY:
Preferred shares, par value: $0.01; 50,000 shares authorized; no shares issued and outstanding
Common shares, par value: $0.01; 200,000 shares authorized; (2021) 69,806 and (2020) 69,620 outstanding before treasury shares	698	696
Additional paid-in capital	2,266,342	2,245,301
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $44,338 at 2021 and $80,451 at 2020	203,733	534,899
Treasury shares, at cost; 30,427 shares (2021) and 29,636 shares (2020)	(3,822,235)	(3,622,172)
Retained earnings	11,330,097	10,567,452
Total shareholders' equity	9,978,635	9,726,176
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	36,606,097	32,788,357
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member]
LIABILITIES:
Senior notes	397,284	397,194
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]
LIABILITIES:
Senior notes	$ 979,915	$ 979,524

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Fixed maturities - available for sale, at market value, amortized cost	$ 21,182,756	$ 19,225,067
Fixed maturities - available for sale, at market value, allowance for credit loss	(31,980)	(1,745)
Short-term investments, at cost	$ 713,144	$ 1,135,088
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common Stock, Shares Authorized	200,000,000	200,000,000
Common shares, outstanding	69,806,000	69,620,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit)	$ 44,338	$ 80,451
Treasury shares	30,427,000	29,636,000
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member]
Debt instrument, maturity date	Jun. 1, 2044	Jun. 1, 2044
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]
Debt instrument, maturity date	Oct. 15, 2050	Oct. 15, 2050
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt instrument, maturity date	May 1, 2067	May 1, 2067

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
REVENUES:
Premiums earned	$ 2,656,403	$ 2,205,811	$ 7,602,640	$ 6,285,030
Net investment income	292,759	234,233	960,267	420,116
Net realized capital gains (losses):
Credit allowances on fixed maturity securities	(7,329)	6,196	(30,234)	(19,641)
Other net realized capital gains (losses)	3,107	104,007	169,023	103,904
Total net realized capital gains (losses)	(4,222)	110,203	138,789	84,263
Other income (expense)	(19,517)	59,937	44,190	47,306
Total revenues	2,925,423	2,610,184	8,745,886	6,836,715
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	2,274,301	1,736,210	5,571,861	4,574,066
Commission, brokerage, taxes and fees	564,335	445,332	1,611,095	1,360,170
Other underwriting expenses	141,150	138,875	424,225	385,865
Corporate expenses	17,817	10,618	46,363	29,184
Interest, fees and bond issue cost amortization expense	15,539	6,641	46,785	21,477
Total claims and expenses	3,013,142	2,337,676	7,700,329	6,370,762
INCOME (LOSS) BEFORE TAXES	(87,719)	272,508	1,045,557	465,953
Income tax expense (benefit)	(14,251)	29,451	97,181	15,404
NET INCOME (LOSS)	(73,468)	243,057	948,376	450,549
Other comprehensive income (loss), net of tax:
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	(100,021)	63,480	(304,465)	335,835
Reclassification adjustment for realized losses (gains) included in net income (loss)	(1,388)	(11,453)	(3,464)	12,689
Total URA(D) on securities arising during the period	(101,409)	52,027	(307,929)	348,524
Foreign currency translation adjustments	(53,599)	60,628	(28,886)	30,390
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	1,563	1,806	5,649	4,532
Total benefit plan net gain (loss) for the period	1,563	1,806	5,649	4,532
Total other comprehensive income (loss), net of tax	(153,445)	114,461	(331,166)	383,446
COMPREHENSIVE INCOME (LOSS)	$ (226,913)	$ 357,518	$ 617,210	$ 833,995
EARNINGS PER COMMON SHARE:
Basic	$ (1.88)	$ 6.08	$ 23.74	$ 11.20
Diluted	$ (1.88)	$ 6.07	$ 23.72	$ 11.18

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]	Retained Earnings [Member]Cumulative Effect Period Of Adoption Adjustment [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2019			$ 694	$ 2,219,660	$ 28,152	$ 10,306,571		$ (3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019							$ (4,214)
Balance, shares at Dec. 31, 2019		40,798,963
Issued during the period, net, shares		159,423
Treasury shares acquired, shares		(970,892)
Issued during the period, net			2
Share-based compensation plans				(3,181)
Net increase (decrease) during the period					(297,903)
Net income (loss)						16,612
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)						(63,277)
Purchase of treasury shares								(200,020)
Balance at Mar. 31, 2020			696	2,216,479	(269,751)	10,255,692		(3,622,172)
Balance, shares at Mar. 31, 2020		39,987,494
Balance at Dec. 31, 2019			694	2,219,660	28,152	10,306,571		(3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019							(4,214)
Balance, shares at Dec. 31, 2019		40,798,963
Net increase (decrease) during the period	$ 383,446
Net income (loss)	450,549
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)	(187,115)
Balance at Sep. 30, 2020	9,591,292		696	2,235,378	411,598	10,565,792		(3,622,172)
Balance, shares at Sep. 30, 2020		39,966,516
Balance at Mar. 31, 2020			696	2,216,479	(269,751)	10,255,692		(3,622,172)
Balance, shares at Mar. 31, 2020		39,987,494
Issued during the period, net, shares		(15,849)
Treasury shares acquired, shares
Issued during the period, net
Share-based compensation plans				9,514
Net increase (decrease) during the period					566,888
Net income (loss)						190,880
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)						(61,927)
Purchase of treasury shares
Balance at Jun. 30, 2020			696	2,225,993	297,137	10,384,645		(3,622,172)
Balance, shares at Jun. 30, 2020		39,971,645
Issued during the period, net, shares		(5,129)
Treasury shares acquired, shares
Issued during the period, net
Share-based compensation plans				9,385
Net increase (decrease) during the period	114,461				114,461
Net income (loss)	243,057					243,057
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)	(61,910)					(61,910)
Purchase of treasury shares
Balance at Sep. 30, 2020	9,591,292		696	2,235,378	411,598	10,565,792		(3,622,172)
Balance, shares at Sep. 30, 2020		39,966,516
Balance at Dec. 31, 2020	$ 9,726,176		696	2,245,301	534,899	10,567,452		(3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020
Balance, shares at Dec. 31, 2020	69,620,000	39,983,481
Issued during the period, net, shares		196,481
Treasury shares acquired, shares		(97,462)
Issued during the period, net			2
Share-based compensation plans				436
Net increase (decrease) during the period					(299,820)
Net income (loss)						341,862
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)						(62,228)
Purchase of treasury shares								(23,545)
Balance at Mar. 31, 2021			698	2,245,737	235,079	10,847,086		(3,645,717)
Balance, shares at Mar. 31, 2021		40,082,500
Balance at Dec. 31, 2020	$ 9,726,176		696	2,245,301	534,899	10,567,452		(3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020
Balance, shares at Dec. 31, 2020	69,620,000	39,983,481
Net increase (decrease) during the period	$ (331,166)
Net income (loss)	948,376
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)	(185,731)
Balance at Sep. 30, 2021	$ 9,978,635		698	2,266,342	203,733	11,330,097		(3,822,235)
Balance, shares at Sep. 30, 2021	69,806,000	39,379,261
Balance at Mar. 31, 2021			698	2,245,737	235,079	10,847,086		(3,645,717)
Balance, shares at Mar. 31, 2021		40,082,500
Issued during the period, net, shares		940
Treasury shares acquired, shares		(68,100)
Issued during the period, net
Share-based compensation plans				10,653
Net increase (decrease) during the period					122,099
Net income (loss)						679,982
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)						(62,046)
Purchase of treasury shares								(16,782)
Balance at Jun. 30, 2021			698	2,256,390	357,178	11,465,022		(3,662,499)
Balance, shares at Jun. 30, 2021		40,015,340
Issued during the period, net, shares		(10,721)
Treasury shares acquired, shares		(625,358)
Issued during the period, net
Share-based compensation plans				9,952
Net increase (decrease) during the period	$ (153,445)				(153,445)
Net income (loss)	(73,468)					(73,468)
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)	(61,457)					(61,457)
Purchase of treasury shares								(159,736)
Balance at Sep. 30, 2021	$ 9,978,635		$ 698	$ 2,266,342	$ 203,733	$ 11,330,097		$ (3,822,235)
Balance, shares at Sep. 30, 2021	69,806,000	39,379,261

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 1.55	$ 1.55	$ 1.55	$ 1.55	$ 1.55	$ 1.55

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 948,376	$ 450,549
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(736,614)	(357,162)
Decrease (increase) in funds held by reinsureds, net	(92,512)	(53,878)
Decrease (increase) in reinsurance recoverables	(230,593)	(172,454)
Decrease (increase) in income taxes	57,270	184,311
Decrease (increase) in prepaid reinsurance premiums	(146,639)	(7,963)
Increase (decrease) in reserve for losses and loss adjustment expenses	2,576,049	1,665,982
Increase (decrease) in future policy benefit reserve	(1,189)	(2,218)
Increase (decrease) in unearned premiums	927,524	392,904
Increase (decrease) in other net payable to reinsurers	198,954	68,784
Increase (decrease) in losses in course of payment	23,661	132,208
Change in equity adjustments in limited partnerships	(543,401)	(12,475)
Distribution of limited partnership income	105,571	55,576
Change in other assets and liabilities, net	(247,615)	(131,224)
Non-cash compensation expense	33,199	29,337
Amortization of bond premium (accrual of bond discount)	57,289	32,594
Net realized capital (gains) losses	(138,789)	(84,263)
Net cash provided by (used in) operating activities	2,790,541	2,190,608
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	2,756,963	1,781,821
Proceeds from fixed maturities sold - available for sale, at market value	883,149	1,390,747
Proceeds from fixed maturities sold - available for sale, at fair value		2,054
Proceeds from equity securities sold, at fair value	578,894	329,750
Distributions from other invested assets	216,573	210,527
Cost of fixed maturities acquired - available for sale, at market value	(5,670,636)	(3,874,890)
Cost of equity securities acquired, at fair value	(507,862)	(460,953)
Cost of other invested assets acquired	(604,180)	(392,650)
Net change in short-term investments	422,643	(804,744)
Net change in unsettled securities transactions	(177,259)	89,064
Net cash provided by (used in) investing activities	(2,101,715)	(1,729,274)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period for share-based compensation, net of expense	(12,156)	(13,617)
Purchase of treasury shares	(200,064)	(200,020)
Dividends paid to shareholders	(185,731)	(187,110)
Cost of debt repurchase		(10,647)
FHLB borrowings (repayments)		90,000
Cost of shares withheld on settlements of share-based compensation awards	(15,133)	(15,298)
Net cash provided by (used in) financing activities	(413,084)	(336,691)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(8,952)	6,203
Net increase (decrease) in cash	266,790	130,845
Cash, beginning of period	801,651	808,036
Cash, end of period	1,068,441	938,881
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	39,767	(169,149)
Interest paid	$ 33,422	$ 16,731

General

General	9 Months Ended
	Sep. 30, 2021
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.

Basis Of Presentation

Basis Of Presentation	9 Months Ended
	Sep. 30, 2021
Basis Of Presentation [Abstract]
Basis Of Presentation	2. BASIS OF PRESENTATION The unaudited consolidated financial statements of the Company as of September 30, 2021 and December 31, 2020 and for the three and nine months ended September 30, 2021 and 2020 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, 2020 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 nine months ended September 30, 2021 and 2020 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, 2020, 2019 and 2018, 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. This is particularly true given the fluid and continuing nature of the COVID-19 Pandemic. This is an ongoing event and so is the Company’s evaluation and analysis. While the Company’s analysis considers all aspects of its operations, it does not take into account legal, regulatory or legislative intervention that could retroactively mandate or expand coverage provisions. Given the uncertainties in the current public health and economic environment, there could be an adverse impact on results for the Property & Casualty industry and the Company for the remainder of the year. The impact is dependent on the shape and length of the economic recovery. All intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior years’ amounts to conform to the 2021 presentation. Application of Recently Issued Accounting Standard Changes. Reference Rate Reform - LIBOR. In March 2020, the Financial Accounting Standards Board (“FASB”) issued ASU 2020-04 (and subsequently issued ASU 2021-01 in January 2021), which outlines the issues surrounding the cessation of LIBOR as a reference rate for contractual debt agreements. The guidance also details the potential alternative expedients and sources available for use in determination of rates and terms for such debt agreements in order to apply appropriate accounting policy. The guidance is effective for annual reporting periods beginning after December 15, 2021. The Company is currently evaluating the impact of the adoption of ASU 2020-04 and 2021-01 on its financial statements. Accounting for Income Taxes. In December 2019, The FASB issued ASU 2019-12, which provides simplification of existing guidance for income taxes, including the removal of certain exceptions related to recognition of deferred tax liabilities on foreign subsidiaries. The guidance is effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. The Company adopted the guidance as of January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s financial statements. Accounting for Long Duration Contracts. In August 2018, FASB issued ASU 2018-12, which discusses changes to the recognition, measurement and presentation of long duration contracts. The main provisions of this guidance address the following: 1) In determining liability for future policy benefits, companies must review cash flow assumptions at least annually and the discount rate assumption at each reporting period date 2) Amortization of deferred acquisition costs has been simplified to be in constant level proportion to either premiums, gross profits or gross margins 3) Disaggregated roll forwards of beginning and ending liabilities for future policy benefits are required. The guidance was originally effective for annual reporting periods beginning after December 15, 2020 and interim periods within that annual reporting period. However, FASB issued ASU 2019-09 in November 2019 and then ASU 2020-11 in November 2021, which ultimately defers the effective date of ASU 2018-12 until annual reporting periods beginning after December 15, 2022. The Company is currently evaluating the impact of the adoption of ASU 2018-12 on its 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	9 Months Ended
	Sep. 30, 2021
Investments [Abstract]
Investments	3. INVESTMENTS The following tables show amortized cost, allowance for credit losses, gross unrealized appreciation, gross unrealized depreciation and market value of available for sale, fixed maturity securities as of the dates indicated: At September 30, 2021 Amortized Allowance for Unrealized Unrealized Market (Dollars in thousands) Cost Credit Losses Appreciation Depreciation Value Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,344,813 $ - $ 28,332 $ ( 10,323) $ 1,362,822 Obligations of U.S. states and political subdivisions 578,289 ( 151) 31,295 ( 1,058) 608,375 Corporate securities 7,315,144 ( 22,890) 254,723 ( 52,736) 7,494,241 Asset-backed securities 3,284,025 ( 7,679) 32,405 ( 3,499) 3,305,252 Mortgage-backed securities Commercial 1,042,504 - 49,729 ( 4,363) 1,087,870 Agency residential 2,208,540 - 45,876 ( 8,415) 2,246,001 Non-agency residential 7,316 - 11 ( 21) 7,306 Foreign government securities 1,428,105 - 54,778 ( 27,738) 1,455,145 Foreign corporate securities 3,974,020 ( 1,260) 129,296 ( 45,949) 4,056,107 Total fixed maturity securities $ 21,182,756 $ ( 31,980) $ 626,445 $ ( 154,102) $ 21,623,119 At December 31, 2020 Amortized Allowance for Unrealized Unrealized Market (Dollars in thousands) Cost Credit Losses Appreciation Depreciation Value Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,325,156 $ - $ 49,084 $ ( 7,134) $ 1,367,106 Obligations of U.S. states and political subdivisions 543,895 - 34,654 ( 1,254) 577,295 Corporate securities 6,824,800 ( 1,220) 380,677 ( 55,231) 7,149,026 Asset-backed securities 2,540,809 - 30,691 ( 5,698) 2,565,802 Mortgage-backed securities Commercial 915,923 - 75,275 ( 895) 990,303 Agency residential 2,206,139 - 64,663 ( 3,063) 2,267,739 Non-agency residential 5,187 - 9 ( 2) 5,194 Foreign government securities 1,565,260 ( 22) 102,587 ( 22,450) 1,645,375 Foreign corporate securities 3,297,898 ( 503) 204,023 ( 29,085) 3,472,333 Total fixed maturity securities $ 19,225,067 $ ( 1,745) $ 941,663 $ ( 124,812) $ 20,040,173 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 September 30, 2021 At December 31, 2020 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,621,263 $ 1,621,541 $ 1,365,793 $ 1,374,674 Due after one year through five years 6,675,763 6,826,936 6,529,189 6,774,785 Due after five years through ten years 4,918,975 5,069,884 4,414,211 4,751,903 Due after ten years 1,424,370 1,458,329 1,247,816 1,309,773 Asset-backed securities 3,284,025 3,305,252 2,540,809 2,565,802 Mortgage-backed securities: Commercial 1,042,504 1,087,870 915,923 990,303 Agency residential 2,208,540 2,246,001 2,206,139 2,267,739 Non-agency residential 7,316 7,306 5,187 5,194 Total fixed maturity securities $ 21,182,756 $ 21,623,119 $ 19,225,067 $ 20,040,173 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities and short-term investments $ ( 108,789) $ 55,587 $ ( 344,370) $ 392,640 Change in unrealized appreciation (depreciation), pre-tax ( 108,789) 55,587 ( 344,370) 392,640 Deferred tax benefit (expense) 7,380 ( 3,560) 36,441 ( 44,116) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ ( 101,409) $ 52,027 $ ( 307,929) $ 348,524 The Company reviews all of its fixed maturity, available for sale securities whose fair value has fallen below their amortized cost at the time of review. The Company then assesses whether the decline in value is due to non-credit related or credit related factors. 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 a credit impairment, but rather a non-credit related decline in market value. Non-credit related declines in market value are recorded as unrealized losses in accumulated other comprehensive income (loss). If the Company intends to sell the security or is more likely than not to sell the security, the Company records the entire fair value adjustment in net realized capital gains (losses) in the Company’s consolidated statements of operations and comprehensive income (loss). If the Company determines that the decline is credit related 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 Company establishes a credit allowance equal to the estimated credit loss and is recorded in net realized capital gains (losses) in the Company’s consolidated statements of operations and comprehensive income (loss). The amount of the allowance for a given security will generally be the difference between a discounted cash flow model and the Company’s carrying value. 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 will adjust the credit allowance account for future changes in credit loss estimates for a security and record this adjustment through net realized capital gains (losses) in the Company’s consolidated statements of operations and comprehensive income (loss). The Company does not create an allowance for uncollectible interest. If interest is not received when due, the interest receivable is immediately reversed and no additional interest is accrued. If future interest is received that has not been accrued, it is recorded as income at that time. The Company’s assessments are based on the issuers’ current and expected future financial position, timeliness with respect to interest and/or principal payments, speed of repayments and any applicable credit enhancements or breakeven constant default rates on mortgage-backed and asset-backed securities, as well as relevant information provided by rating agencies, investment advisors and analysts. Retrospective adjustments are employed to recalculate the values of asset-backed securities. All of the Company’s asset-backed and mortgage-backed securities have a pass-through structure. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used in the calculation of projected prepayments for pass-through security types. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity 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 September 30, 2021 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 $ 381,357 $ ( 6,369) $ 57,084 $ ( 3,954) $ 438,441 $ ( 10,323) Obligations of U.S. states and political subdivisions 61,687 ( 937) 3,569 ( 121) 65,256 ( 1,058) Corporate securities 1,559,623 ( 32,541) 399,617 ( 20,195) 1,959,240 ( 52,736) Asset-backed securities 610,425 ( 3,131) 23,396 ( 368) 633,821 ( 3,499) Mortgage-backed securities Commercial 108,367 ( 3,138) 26,144 ( 1,225) 134,511 ( 4,363) Agency residential 814,318 ( 5,631) 134,746 ( 2,784) 949,064 ( 8,415) Non-agency residential 2,742 ( 19) 156 ( 2) 2,898 ( 21) Foreign government securities 382,570 ( 22,491) 58,238 ( 5,247) 440,808 ( 27,738) Foreign corporate securities 1,221,503 ( 34,080) 183,579 ( 11,869) 1,405,082 ( 45,949) Total fixed maturity securities $ 5,142,592 $ ( 108,337) $ 886,529 $ ( 45,765) $ 6,029,121 $ ( 154,102) Duration of Unrealized Loss at September 30, 2021 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 178,193 $ ( 6,982) $ 150,934 $ ( 11,210) $ 329,127 $ ( 18,192) Due in one year through five years 1,494,463 ( 33,475) 381,773 ( 17,997) 1,876,236 ( 51,472) Due in five years through ten years 1,466,402 ( 45,526) 123,239 ( 9,696) 1,589,641 ( 55,222) Due after ten years 467,682 ( 10,435) 46,141 ( 2,483) 513,823 ( 12,918) Asset-backed securities 610,425 ( 3,131) 23,396 ( 368) 633,821 ( 3,499) Mortgage-backed securities 925,427 ( 8,788) 161,046 ( 4,011) 1,086,473 ( 12,799) Total fixed maturity securities $ 5,142,592 $ ( 108,337) $ 886,529 $ ( 45,765) $ 6,029,121 $ ( 154,102) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at September 30, 2021 were $ 6,029.1 million and $ 154.1 million, respectively. The market value of securities for the single issuer (the United States government) whose securities comprised the largest unrealized loss position at September 30, 2021, did not exceed 1.7% 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 position at September 30, 2021, comprised less than 0.6% 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 $ 108.3 million 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, U.S. Treasury and government securities and agency residential mortgage-backed securities. Of these unrealized losses, $ 101.6 million were related to securities that were rated investment grade by at least one nationally recognized rating agency. The $ 45.8 million 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 and foreign government securities. Of these unrealized losses, $ 43.4 million were related to securities that were rated investment grade by at least one nationally recognized rating agency. There was no gross unrealized depreciation for mortgage-backed securities 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 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. Duration of Unrealized Loss at December 31, 2020 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 $ 135,190 $ ( 7,134) $ - $ - $ 135,190 $ ( 7,134) Obligations of U.S. states and political subdivisions 19,524 ( 999) 4,059 ( 255) 23,583 ( 1,254) Corporate securities 669,755 ( 26,159) 247,962 ( 29,072) 917,717 ( 55,231) Asset-backed securities 235,566 ( 4,768) 85,595 ( 930) 321,161 ( 5,698) Mortgage-backed securities Commercial 53,511 ( 578) 6,592 ( 317) 60,103 ( 895) Agency residential 434,447 ( 2,016) 50,353 ( 1,047) 484,800 ( 3,063) Non-agency residential 185 ( 2) - - 185 ( 2) Foreign government securities 114,755 ( 8,813) 150,812 ( 13,637) 265,567 ( 22,450) Foreign corporate securities 354,548 ( 17,489) 115,595 ( 11,596) 470,143 ( 29,085) Total fixed maturity securities $ 2,017,481 $ ( 67,958) $ 660,968 $ ( 56,854) $ 2,678,449 $ ( 124,812) Duration of Unrealized Loss at December 31, 2020 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 $ 96,144 $ ( 4,942) $ 112,419 $ ( 12,071) $ 208,563 $ ( 17,013) Due in one year through five years 653,816 ( 32,469) 283,866 ( 21,319) 937,682 ( 53,788) Due in five years through ten years 422,517 ( 19,392) 49,749 ( 2,034) 472,266 ( 21,426) Due after ten years 121,295 ( 3,791) 72,394 ( 19,136) 193,689 ( 22,927) Asset-backed securities 235,566 ( 4,768) 85,595 ( 930) 321,161 ( 5,698) Mortgage-backed securities 488,143 ( 2,596) 56,945 ( 1,364) 545,088 ( 3,960) Total fixed maturity securities $ 2,017,481 $ ( 67,958) $ 660,968 $ ( 56,854) $ 2,678,449 $ ( 124,812) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2020 were $ 2,678.4 million and $ 124.8 million, respectively. The market value of securities for the single issuer whose securities comprised the largest unrealized loss position at December 31, 2020, did not exceed 0.7% 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 0.1% 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 $ 68.0 million of unrealized losses related to fixed maturity securities that have been in an unrealized loss position for less than one year were generally comprised of domestic and foreign corporate securities and foreign government securities. Of these unrealized losses, $ 63.4 million were related to securities that were rated investment grade by at least one nationally recognized rating agency. The $ 56.9 million 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 and agency residential mortgage-backed securities. Of these unrealized losses, $ 33.5 million were related to securities that were rated investment grade by at least one nationally recognized rating agency. There was no gross unrealized depreciation for mortgage-backed securities 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Fixed maturities $ 134,157 $ 136,104 $ 423,335 $ 407,946 Equity securities 3,774 4,402 12,105 11,585 Short-term investments and cash 82 494 1,035 4,356 Other invested assets: Limited partnerships 138,718 88,778 493,017 22,092 Other 30,954 14,742 62,828 ( 1,291) Gross investment income before adjustments 307,685 244,520 992,320 444,688 Funds held interest income (expense) 1,196 684 12,449 10,921 Future policy benefit reserve income (expense) ( 272) ( 291) ( 733) ( 805) Gross investment income 308,609 244,913 1,004,036 454,804 Investment expenses ( 15,850) ( 10,680) ( 43,769) ( 34,688) Net investment income $ 292,759 $ 234,233 $ 960,267 $ 420,116 The Company records results from limited partnership investments on the equity method of accounting with changes in value reported through net investment income. The net investment income from limited partnerships is dependent upon the Company’s share of the net asset values of interests underlying each limited partnership. 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 $ 2,648.1 million in limited partnerships and private placement loan securities at September 30, 2021. These commitments will be funded when called in accordance with the partnership and loan agreements, which have investment periods that expire, unless extended, through 2026 The Company participates 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. The Company consolidates its participation in the facility. As of September 30, 2021, the market value of investments in the facility consolidated within the Company’s balance sheets was $ 429.7 million. The components of net realized capital gains (losses) are presented in the tables below for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Fixed maturity securities, market value: Allowance for credit losses $ ( 7,329) $ 6,196 $ ( 30,234) $ ( 19,641) Gains (losses) from sales 6,219 5,398 25,453 941 Fixed maturity securities, fair value: Gains (losses) from sales - ( 1,968) - ( 1,968) Gains (losses) from fair value adjustments - 3,339 - 1,944 Equity securities, fair value: Gains (losses) from sales ( 489) ( 1,317) 9,504 ( 12,642) Gains (losses) from fair value adjustments ( 4,542) 96,673 128,039 114,364 Other invested assets 1,920 1,084 6,014 50 Short-term investments gain (loss) - 798 13 1,215 Total net realized capital gains (losses) $ ( 4,222) $ 110,203 $ 138,789 $ 84,263 (Some amounts may not reconcile due to rounding.) Roll Forward of Allowance for Credit Losses Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Obligations of Obligations of U.S. States Foreign Foreign U.S. States Foreign Foreign Corporate Asset-Backed and Political Government Corporate Corporate Asset-Backed and Political Government Corporate Securities Securities Subdivisions Securities Securities Total Securities Securities Subdivisions Securities Securities Total (Dollars in thousands) Beginning Balance $ ( 18,475) $ ( 4,915) $ - $ - $ ( 1,260) $ ( 24,650) $ ( 1,220) $ - $ - $ ( 22) $ ( 503) $ ( 1,745) Credit losses on securities where credit losses were not previously recorded ( 5,257) ( 151) - - ( 5,408) ( 21,177) ( 4,915) ( 151) - ( 1,055) ( 27,298) Increases in allowance on previously impaired securities ( 620) ( 2,764) - - - ( 3,384) ( 2,088) ( 2,764) - - - ( 4,852) Decreases in allowance on previously impaired securities - - - - - - - - - - - - Reduction in allowance due to disposals 1,462 - - - - 1,462 1,595 - - 22 298 1,915 Balance as of September 30, 2021 $ ( 22,890) $ ( 7,679) $ ( 151) $ - $ ( 1,260) $ ( 31,980) $ ( 22,890) $ ( 7,679) $ ( 151) $ - $ ( 1,260) $ ( 31,980) Roll Forward of Allowance for Credit Losses Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Foreign Foreign Foreign Foreign Corporate Government Corporate Corporate Government Corporate Securities Securities Securities Total Securities Securities Securities Total (Dollars in thousands) Beginning Balance $ ( 22,253) $ ( 92) $ ( 3,492) $ ( 25,837) $ - $ - $ - $ - Credit losses on securities where credit losses were not previously recorded ( 6) - ( 144) ( 150) ( 27,666) ( 519) ( 4,699) ( 32,884) Increases in allowance on previously - impaired securities ( 5,354) ( 27) ( 181) ( 5,562) ( 6,136) ( 27) ( 481) ( 6,644) Decreases in allowance on previously impaired securities 159 - 151 310 3,590 212 844 4,646 Reduction in allowance due to disposals 9,980 - 1,618 11,598 12,738 215 2,288 15,241 Balance as of September 30, 2020 $ ( 17,474) $ ( 119) $ ( 2,048) $ ( 19,641) $ ( 17,474) $ ( 119) $ ( 2,048) $ ( 19,641) The Company recorded as net realized capital gains (losses) in the consolidated statements of operations and comprehensive income (loss) fair value re-measurements, allowances for credit losses per ASU 2016-13 and write-downs in the value of securities deemed to be impaired on an other-than-temporary basis in prior years as displayed in the table above. 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Proceeds from sales of fixed maturity securities $ 283,412 $ 402,528 $ 883,149 $ 1,392,801 Gross gains from sales 17,004 18,721 51,738 54,077 Gross losses from sales ( 10,785) ( 15,291) ( 26,285) ( 55,104) Proceeds from sales of equity securities $ 104,231 $ 116,565 $ 578,894 $ 329,750 Gross gains from sales 2,768 9,512 20,875 30,268 Gross losses from sales ( 3,257) ( 10,829) ( 11,371) ( 42,910)

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	9 Months Ended
	Sep. 30, 2021
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: Nine Months Ended September 30, (Dollars in thousands) 2021 2020 Gross reserves beginning of period $ 16,398,997 $ 13,611,313 Less reinsurance recoverables on unpaid losses ( 1,843,691) ( 1,640,712) Net reserves beginning of period 14,555,306 11,970,601 Incurred related to: Current year 5,577,911 4,572,640 Prior years ( 6,050) 1,426 Total incurred losses and LAE 5,571,861 4,574,066 Paid related to: Current year 1,375,665 1,015,538 Prior years 1,786,393 2,042,712 Total paid losses and LAE 3,162,058 3,058,250 Foreign exchange/translation adjustment ( 41,000) ( 28,024) Net reserves end of period 16,924,109 13,458,393 Plus reinsurance recoverables on unpaid losses 2,032,844 1,774,732 Gross reserves end of period $ 18,956,953 $ 15,233,125 (Some amounts may not reconcile due to rounding.) Current year incurred losses were $ 5,577.9 million and $ 4,572.6 million for the nine months ended September 30, 2021 and 2020, respectively. Gross and net reserves increased for the nine months ended September 30, 2021, reflecting an increase in underlying exposure due to premium growth and catastrophe losses of $ 1,010.0 million and $ 355.0 million for the nine months ended September 30, 2021 and 2020, respectively. In addition, current year incurred losses for the nine months ended September 30, 2020 included $ 434.9 million of losses associated with the COVID-19 Pandemic which did not recur in 2021.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2021
Fair Value [Abstract]
Fair Value	5. 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 managing publicly traded securities 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. 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 September 30, 2021, $ 1,803.0 million of fixed maturities, market value were fair valued using unobservable inputs. The majority of these fixed maturities were valued by investment managers’ valuation committees and many of these fair values were substantiated by valuations from independent third parties. The Company has procedures in place to evaluate these independent third party valuations. At December 31, 2020, $ 1,330.2 million of fixed maturities, market value were fair valued using unobservable inputs. The Company internally manages a public equity portfolio which had a fair value at September 30, 2021 and December 31, 2020 of $ 1,253.9 million and $ 784.7 million, 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. In addition to the valuations from investment managers, some of 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 may 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 Level 1 and Level 2 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 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) September 30, 2021 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,362,822 $ - $ 1,362,822 $ - Obligations of U.S. States and political subdivisions 608,375 - 608,375 - Corporate securities 7,494,241 - 6,700,200 794,041 Asset-backed securities 3,305,252 - 2,301,183 1,004,069 Mortgage-backed securities Commercial 1,087,870 - 1,087,870 - Agency residential 2,246,001 - 2,246,001 - Non-agency residential 7,306 - 7,306 - Foreign government securities 1,455,145 - 1,455,145 - Foreign corporate securities 4,056,107 - 4,051,232 4,875 Total fixed maturities, market value 21,623,119 - 19,820,134 1,802,985 Equity securities, fair value 1,523,595 1,451,271 72,324 - Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2020 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,367,106 $ - $ 1,367,106 $ - Obligations of U.S. States and political subdivisions 577,295 - 577,295 - Corporate securities 7,149,026 - 6,447,534 701,492 Asset-backed securities 2,565,802 - 1,942,769 623,033 Mortgage-backed securities Commercial 990,303 - 990,303 - Agency residential 2,267,739 - 2,267,739 - Non-agency residential 5,194 - 5,194 - Foreign government securities 1,645,375 - 1,645,375 - Foreign corporate securities 3,472,333 - 3,466,634 5,699 Total fixed maturities, market value 20,040,173 - 18,709,949 1,330,224 Equity securities, fair value 1,472,236 1,368,704 103,532 - In addition, $ 266.3 million and $ 224.7 million of investments within other invested assets on the consolidated balance sheets as of September 30, 2021 and December 31, 2020, 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 for fixed maturities, for the periods indicated: Total Fixed Maturities, Market Value Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Corporate Asset-Backed Foreign Corporate Asset-Backed Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Securities Corporate Total Beginning balance fixed maturities at market value $ 705,571 $ 815,276 $ 4,887 $ 1,525,734 $ 701,492 $ 623,033 $ 5,699 $ 1,330,224 Total gains or (losses) (realized/unrealized) Included in earnings 3,184 ( 3,292) 33 ( 75) ( 12,366) ( 7,254) 173 ( 19,447) Included in other comprehensive income (loss) ( 1,311) ( 381) ( 34) ( 1,726) 6,107 4,094 ( 70) 10,131 Purchases, issuances and settlements 86,597 192,466 ( 12) 279,051 98,808 384,196 ( 928) 482,076 Transfers in and/or (out) of Level 3 - - - - - - - - Ending balance $ 794,041 $ 1,004,069 $ 4,875 $ 1,802,984 $ 794,041 $ 1,004,069 $ 4,875 $ 1,802,984 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 $ 761 $ ( 2,764) $ - $ ( 2,003) $ ( 16,518) $ ( 7,679) $ - $ ( 24,197) (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Corporate Asset-Backed Foreign Corporate Asset-Backed Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Securities Corporate Total Beginning balance fixed maturities at market value $ 721,834 $ 295,730 $ 6,274 $ 1,023,838 $ 617,588 $ 153,641 $ 1,750 $ 772,979 Total gains or (losses) (realized/unrealized) Included in earnings 362 457 26 845 ( 100) 582 ( 71) 411 Included in other comprehensive income (loss) ( 992) 5,028 126 4,162 ( 4,898) 7,238 86 2,426 Purchases, issuances and settlements ( 1,349) 103,574 139 102,364 112,060 243,328 3,823 359,211 Transfers in and/or (out) of Level 3 4,189 - ( 863) 3,326 ( 606) - 114 ( 492) Ending balance $ 724,044 $ 404,789 $ 5,702 $ 1,134,535 $ 724,044 $ 404,789 $ 5,702 $ 1,134,535 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 $ - $ - $ - $ - $ ( 539) $ - $ - $ ( 539) (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 4,431 $ 4,431 $ 5,826 $ 5,826 Total gains or (losses) (realized/unrealized) Included in earnings 1,371 1,371 ( 24) ( 24) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements ( 2,054) ( 2,054) ( 2,054) ( 2,054) Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,748 $ 3,748 $ 3,748 $ 3,748 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.) There were no net transfers to/(from) level 3, fair value measurements using significant unobservable inputs for fixed maturities, market value for the three and nine months ended September 30, 2021, respectively. The net transfers to/(from) level 3, fair value measurements using significant unobservable inputs for fixed maturities, market value were $ 3.3 million and ($ 0.5) million for the three and nine months ended September 30, 2020, respectively. The net transfers of $ 3.3 million during the three months ended September 30, 2020 were previously priced by a recognized pricing service and were subsequently priced using investment managers as of September 30, 2020. The net transfers of ($ 0.5) million during the nine months ended September 30, 2020 were related to securities that were previously priced using investment managers and were subsequently priced by a recognized pricing service as of September 30, 2020. The following table presents the activity under Level 3, fair value measurements using significant unobservable inputs for equity securities, for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Common Stock Balance, beginning of period $ - $ 9,877 $ - $ - Total (gains) or losses (realized/unrealized) Included in earnings - - - - Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - 9,877 Transfers in and/or (out) of Level 3 - ( 9,877) - ( 9,877) Balance, end of period $ - $ - $ - $ - 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.) The net transfers to/(from) level 3, fair value measurements using significant unobservable inputs for equity securities, fair value were ($ ) million for both the three and nine months ended September 30, 2020. The transfers of ($ ) million during both the three and nine months ended September 30, 2020, were related to preferred stock in a private entity purchased during the second quarter of 2020 which was priced at cost as of June 30, 2020 and was subsequently priced based upon the book value of the underlying private entity as of September 30, 2020.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Common Share [Abstract]
Earnings Per Common Share	6. 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 Nine Months Ended September 30, September 30, (Dollars in thousands, except per share amounts) 2021 2020 2021 2020 Net income (loss) per share: Numerator Net income (loss) $ ( 73,468) $ 243,057 $ 948,376 $ 450,549 Less: dividends declared-common shares and unvested common shares ( 61,457) ( 61,910) ( 185,731) ( 187,115) Undistributed earnings ( 134,925) 181,148 762,646 263,435 Percentage allocated to common shareholders (1) 100.0 % 98.8 % 98.7 % 98.7 % ( 134,925) 178,938 752,414 260,096 Add: dividends declared-common shareholders 61,457 61,199 183,333 184,836 Numerator for basic and diluted earnings per common share $ ( 73,468) $ 240,138 $ 935,748 $ 444,931 Denominator Denominator for basic earnings per weighted-average common shares 39,161 39,483 39,409 39,711 Effect of dilutive securities: Options 36 74 44 79 Denominator for diluted earnings per adjusted weighted-average common shares 39,197 39,557 39,452 39,790 Per common share net income (loss) Basic $ ( 1.88) $ 6.08 $ 23.74 $ 11.20 Diluted $ ( 1.88) $ 6.07 $ 23.72 $ 11.18 (1) Basic weighted-average common shares outstanding 39,161 39,483 39,409 39,711 Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,161 39,971 39,945 40,221 Percentage allocated to common shareholders 100.0 % 98.8 % 98.7 % 98.7 % (Some amounts may not reconcile due to rounding.) There were no anti-diluted options outstanding for the three and nine months ended September 30, 2021 and 2020. All outstanding options granted under share-based compensation plans expire on or between February 22, 2022 and September 19, 2022.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies [Abstract]
Commitments And Contingencies	7. 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 had one equity index put option contract at September 30, 2021, based on the Standard & Poor’s 500 (“S&P 500”) index. Based on historical index volatilities and trends and the September 30, 2021 S&P 500 index value, the Company estimates the probability that the equity index put option contract of the S&P 500 index falling below the strike price on the exercise date to be less than 0.1%. The theoretical maximum payout under this equity index put option contract would occur if on the exercise date the S&P 500 index value was zero. At September 30, 2021, the present value of the theoretical maximum payout using a 3% discount factor was $ 151.2 million. Conversely, if the contract had expired on September 30, 2021, with the S&P index at 4,307.54, there would have been no settlement amount. 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 September 30, At December 31, (Dollars in thousands) 2021 2020 The Prudential $ 138,869 $ 140,773 Unaffiliated life insurance company 34,163 35,128

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	8. 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 September 30, 2021 Nine Months Ended September 30, 2021 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related $ ( 107,980) $ 7,959 $ ( 100,021) $ ( 343,137) $ 38,672 $ ( 304,465) Reclassification of net realized losses (gains) included in net income (loss) ( 809) ( 579) ( 1,388) ( 1,233) ( 2,231) ( 3,464) Foreign currency translation adjustments ( 59,094) 5,495 ( 53,599) ( 30,060) 1,174 ( 28,886) Reclassification of benefit plan liability amortization included in net income (loss) 1,979 ( 416) 1,563 7,151 ( 1,502) 5,649 Total other comprehensive income (loss) $ ( 165,904) $ 12,459 $ ( 153,445) $ ( 367,279) $ 36,113 $ ( 331,166) Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related $ 68,264 $ ( 4,784) $ 63,480 $ 373,990 $ ( 38,155) $ 335,835 Reclassification of net realized losses (gains) included in net income (loss) ( 12,678) 1,225 ( 11,453) 18,650 ( 5,961) 12,689 Foreign currency translation adjustments 64,453 ( 3,825) 60,628 28,555 1,835 30,390 Reclassification of benefit plan liability amortization included in net income (loss) 2,285 ( 479) 1,806 5,736 ( 1,204) 4,532 Total other comprehensive income (loss) $ 122,324 $ ( 7,863) $ 114,461 $ 426,931 $ ( 43,485) $ 383,446 The following table presents details of the amounts reclassified from AOCI for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, Affected line item within the statements of AOCI component 2021 2020 2021 2020 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 809) $ ( 12,678) $ ( 1,233) $ 18,650 Other net realized capital gains (losses) ( 579) 1,225 ( 2,231) ( 5,961) Income tax expense (benefit) $ ( 1,388) $ ( 11,453) $ ( 3,464) $ 12,689 Net income (loss) Benefit plan net gain (loss) $ 1,979 $ 2,285 $ 7,151 $ 5,736 Other underwriting expenses ( 416) ( 479) ( 1,502) ( 1,204) Income tax expense (benefit) $ 1,563 $ 1,806 $ 5,649 $ 4,532 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Beginning balance of URA (D) on securities $ 517,639 $ 600,922 $ 724,159 $ 304,425 Current period change in URA (D) of investments - non-credit related ( 101,409) 52,027 ( 307,929) 348,524 Ending balance of URA (D) on securities 416,230 652,949 416,230 652,949 Beginning balance of foreign currency translation adjustments ( 90,677) ( 231,955) ( 115,390) ( 201,717) Current period change in foreign currency translation adjustments ( 53,599) 60,628 ( 28,886) 30,390 Ending balance of foreign currency translation adjustments ( 144,276) ( 171,327) ( 144,276) ( 171,327) Beginning balance of benefit plan net gain (loss) ( 69,784) ( 71,830) ( 73,870) ( 74,556) Current period change in benefit plan net gain (loss) 1,563 1,806 5,649 4,532 Ending balance of benefit plan net gain (loss) ( 68,221) ( 70,024) ( 68,221) ( 70,024) Ending balance of accumulated other comprehensive income (loss) $ 203,733 $ 411,598 $ 203,733 $ 411,598 (Some amounts may not reconcile due to rounding.)

Credit Facilities

Credit Facilities	9 Months Ended
	Sep. 30, 2021
Credit Facilities [Abstract]
Credit Facilities	9. CREDIT FACILITIES The Company has multiple active credit facilities for a total commitment of up to $ 1,530.0 million and an additional credit facility for a total commitment of up to £ 52.2 million, providing for the issuance of letters of credit and/or unsecured revolving credit lines. The Company also has additional uncommitted credit facilities of up to $ 140.0 million which may be accessible via written request and corresponding authorization from the applicable lender. The following table presents the interest and fees incurred in connection with these committed credit facilities for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Credit facility interest and fees incurred $ - $ 105 $ 175 $ 560 Loan interest and fees incurred - Federal Home Loan Bank 281 27 827 27 Total interest and fees incurred $ 281 $ 132 $ 1,002 $ 587 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, $ 800.0 million senior credit facility with a syndicate of lenders, which amended and restated in its entirety the June 22, 2012, four year, $ 800.0 million senior credit facility. Both the May 26, 2016 and June 22, 2012 senior credit facilities, which have similar terms, are referred to as the “2016 Group Credit Facility”. Wells Fargo Corporation (“Wells Fargo Bank”) is the administrative agent for the 2016 Group Credit Facility, which consists of two tranches. Tranche one provides up to $ 200.0 million of unsecured revolving credit for liquidity and general corporate purposes, and for the issuance of unsecured standby letters of credit. Tranche two exclusively provides up to $ 600.0 million for the issuance of standby letters of credit on a collateralized basis. Effective May 26, 2021, the term of the 2016 Group Credit Facility expired. The Company elected not to renew this facility to allow for the replacement by new credit facilities, including the 2021 Bermuda Re Wells Fargo Letter of Credit Facility, detailed below. As a result, Tranche One of the Group Credit Facility (unsecured revolving credit in the amount of $ 200.0 million) is no longer effective or available for use. The $ 600.0 million of credit availability in Tranche two will be in run-off and able to support standby letters of credit currently in force through December 31, 2021. As of December 31, 2021, the entirety of the 2016 Group Credit Facility will have expired and will no longer be effective. This collateralized letter of credit capacity will be replaced with additional bilateral collateralized letters of credit. 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 $ 5,371.0 million 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 September 30, 2021, was $ 6,651.8 million. As of September 30, 2021, 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 September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ - $ - $ 200,000 $ 164,242 12/31/2021 Tranche Two 600,000 402,284 12/31/2021 600,000 589,690 12/31/2021 Total Wells Fargo Bank Group Credit Facility $ 600,000 $ 402,284 $ 800,000 $ 753,932 Bermuda Re Wells Fargo Letter of Credit Facility Effective February 23, 2021, Bermuda Re entered into a letter of credit issuance facility with Wells Fargo referred to as the “2021 Bermuda Re Wells Fargo Letter of Credit Facility.” The Bermuda Re Wells Fargo Letter of Credit Facility originally provided for the issuance of up to $ 50.0 million of secured letters of credit. Effective May 5, 2021, the agreement was amended to provide for the issuance of up to $ 500.0 million of secured letters of credit. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At September 30, 2021 Bank Commitment In Use Date of Expiry Wells Fargo Bank Bilateral LOC Agreement $ 500,000 $ 404,157 12/31/2021 $ 500,000 $ 404,157 Bermuda Re Citibank Letter of Credit Facility Effective August 9, 2021, Bermuda Re entered into a new letter of credit issuance facility with Citibank N.A. which superseded the previous letter of credit issuance facility with Citibank N.A. that was effective December 31, 2020. Both of these agreements are referred to as the “Bermuda Re Citibank Letter of Credit Facility”. The current Bermuda Re Citibank Letter of Credit Facility provides for the committed issuance of up to $ 230.0 million of secured letters of credit. In addition, the facility provided for the uncommitted issuance of up the $ 140.0 million, which may be accessible via written request by the Company and corresponding authorization from Citibank N.A. The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 230,000 $ 1,264 11/24/2021 $ 200,000 $ 4,425 02/28/2021 429 12/16/2021 3,672 11/24/2021 139,887 12/31/2021 448 12/16/2021 4,425 02/28/2022 115 12/20/2021 838 03/01/2022 136,383 12/31/2021 148 12/20/2022 39,619 12/30/2024 28,498 12/31/2022 821 08/15/2022 999 08/15/2023 - 1,252 09/23/2023 - 22,964 09/30/2025 - Total Citibank Bilateral Agreement $ 230,000 $ 200,704 $ 200,000 $ 185,483 Everest International Credit Facility Effective May 12, 2020, Everest International amended its credit facility with Lloyds Bank plc (“Everest International Credit Facility”). The current amendment of the Everest International Credit Facility provides up to £ 52.2 million for the issuance of standby letters of credit on a collateralized basis. 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 $ 6,393.0 million ( 70% of consolidated net worth as of December 31, 2019), plus 25% of consolidated net income for each of Group’s fiscal quarters, for which statements are available ending on or after January 1, 2020 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 September 30, 2021, was $ 6,788.7 million. As of September 30, 2021, 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 September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 52,175 £ 52,175 12/31/2024 £ 52,175 £ 52,175 12/31/2023 Total Lloyd's Bank Credit Facility £ 52,175 £ 52,175 £ 52,175 £ 52,175 Bermuda Re Bayerische Landesbank Credit Facility Effective August 9, 2021 Bermuda Re entered into a letter of credit issuance facility with Bayerische Landesbank, an agreement referred to as the “Bermuda Re Bayerische Landesbank Credit Facility”. The Bermuda Re Bayerische Landesbank Credit Facility provides for the committed issuance of up to $ 200.0 million of secured letters of credit. (Dollars in thousands) At September 30, 2021 Bank Commitment In Use Date of Expiry Bayerische Landesbank Bilateral Letter of Credit Agreement $ 200,000 $ - Total Bayerische Landesbank Bilateral Agreement $ 200,000 $ - Federal Home Loan Bank Membership Everest Reinsurance Company (“Everest Re”) is a member of the Federal Home Loan Bank of New York (“FHLBNY”), which allows Everest Re to borrow up to 10% of its statutory admitted assets. As of September 30, 2021, Everest Re had admitted assets of approximately $ 18,874.0 million which provides borrowing capacity of up to approximately $ 1,887.4 million. During 2020, Everest Re borrowed $ 400.0 million under its FHLBNY capacity. The borrowings have interest payable at an interest rate of 0.35%. As of September 30, 2021, $310.0 million of these borrowings remain outstanding, with maturities in November December 2021 4.5% of borrowed funds be used to acquire additional membership stock.

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	9 Months Ended
	Sep. 30, 2021
Collateralized Reinsurance And Trust Agreements [Abstract]
Collateralized Reinsurance And Trust Agreements	10. 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 September 30, 2021, the total amount on deposit in trust accounts was $ 1,526.1 million. The Company reinsures some of its catastrophe exposures with the segregated accounts of Mt. Logan Re. Mt. Logan Re is a Collateralized insurer registered in Bermuda and 100% of the voting common shares are owned by Group. 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 Nine Months Ended September 30, September 30, Mt. Logan Re Segregated Accounts 2021 2020 2021 2020 (Dollars in thousands) Ceded written premiums $ 114,694 $ 86,712 $ 269,987 $ 245,422 Ceded earned premiums 100,133 71,396 249,662 233,089 Ceded losses and LAE 169,998 87,917 281,893 173,968 Assumed written premiums 4,273 8,894 9,490 14,448 Assumed earned premiums 4,273 8,894 9,490 14,448 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 $ 847.3 million and $ 806.6 million at September 30, 2021 and December 31, 2020, respectively. Of this amount, Group had investments recorded at $ 61.6 million and $ 67.6 million at September 30, 2021 and December 31, 2020, 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 $ 269.2 million 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 $ 252.0 million to the Mt. Logan Re segregated account. The maximum liability to be retroceded under the agreement will be $ 319.0 million. The Company will retain liability for any amounts exceeding the maximum liability. As of September 30, 2021 and December 31, 2020, the Company has a reinsurance recoverable of $ 217.5 million and $ 254.9 million, respectively. In addition, the Company has a deferred gain liability of $ 34.4 million and $ 38.8 million as of September 30, 2021 and December 31, 2020, respectively, reported in other liabilities. The Company entered into various collateralized reinsurance agreements with Kilimanjaro Re Limited (“Kilimanjaro”), a Bermuda based special purpose reinsurer, to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover named storm and earthquake events. The table below summarizes the various agreements. (Dollars in thousands) Class Description Effective Date Expiration Date Limit Coverage Basis Series 2017-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 50,000 Aggregate Series 2017-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 75,000 Aggregate Series 2017-1 Class C-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 175,000 Aggregate Series 2018-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/6/2022 62,500 Aggregate Series 2018-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/6/2022 200,000 Aggregate Series 2018-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 62,500 Aggregate Series 2018-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 200,000 Aggregate Series 2019-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 150,000 Occurrence Series 2019-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 275,000 Aggregate Series 2019-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 150,000 Occurrence Series 2019-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 275,000 Aggregate Series 2021-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 150,000 Occurrence Series 2021-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85,000 Aggregate Series 2021-1 Class C-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85,000 Aggregate Series 2021-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 150,000 Occurrence Series 2021-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90,000 Aggregate Series 2021-1 Class C-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90,000 Aggregate Total available limit as of September 30, 2021 $ 2,325,000 Recoveries under these collateralized reinsurance agreements with Kilimanjaro are primarily dependent on estimated industry level insured losses from covered events, as well as, the geographic location of the events. The estimated industry level of insured losses is obtained from published estimates by an independent recognized authority on insured property losses. Currently, none of the published insured loss estimates for catastrophe events during the applicable covered periods of the various agreements have exceeded the single event retentions or aggregate retentions under the terms of the agreements that would result in a recovery. Kilimanjaro has financed the various property catastrophe reinsurance coverages by issuing catastrophe bonds to unrelated, external investors. The proceeds from the issuance of the Notes listed below are held in reinsurance trusts throughout the duration of the applicable reinsurance agreements and invested solely in U.S. government money market funds with a rating of at least “AAAm” by Standard & Poor’s. (Dollars in thousands) Note Series Issue Date Maturity Date Amount Series 2017-1 Class A-2 4/13/2017 4/13/2022 $ 50,000 Series 2017-1 Class B-2 4/13/2017 4/13/2022 75,000 Series 2017-1 Class C-2 4/13/2017 4/13/2022 175,000 Series 2018-1 Class A-1 4/30/2018 5/6/2022 62,500 Series 2018-1 Class B-1 4/30/2018 5/6/2022 200,000 Series 2018-1 Class A-2 4/30/2018 5/5/2023 62,500 Series 2018-1 Class B-2 4/30/2018 5/5/2023 200,000 Series 2019-1 Class A-1 12/12/2019 12/19/2023 150,000 Series 2019-1 Class B-1 12/12/2019 12/19/2023 275,000 Series 2019-1 Class A-2 12/12/2019 12/19/2024 150,000 Series 2019-1 Class B-2 12/12/2019 12/19/2024 275,000 Series 2021-1 Class A-1 4/8/2021 4/21/2025 150,000 Series 2021-1 Class B-1 4/8/2021 4/21/2025 85,000 Series 2021-1 Class C-1 4/8/2021 4/21/2025 85,000 Series 2021-1 Class A-2 4/8/2021 4/20/2026 150,000 Series 2021-1 Class B-2 4/8/2021 4/20/2026 90,000 Series 2021-1 Class C-2 4/8/2021 4/20/2026 90,000

Senior Notes

Senior Notes	9 Months Ended
	Sep. 30, 2021
Senior Notes [Abstract]
Senior Notes	11. SENIOR NOTES The table below displays Everest Reinsurance Holdings’ (“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. September 30, 2021 December 31, 2020 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868% Senior notes 6/5/2014 6/1/2044 400,000 $ 397,284 $ 506,828 $ 397,194 $ 528,000 3.5% Senior notes 10/07/2020 10/15/2050 1,000,000 979,915 1,065,400 979,524 1,138,100 On June 5, 2014, Holdings issued $ 400.0 million of 30 year senior notes with an interest coupon rate of 4.868%, which will mature on June 1, 2044. Interest is paid semi-annually on June 1 and December 1 of each year. On October 7, 2020, Holdings issued $ 1,000.0 million of 30 year senior notes with an interest coupon rate of 3.50%, which will mature on October 15, 2050. Interest is paid semi-annually on April 15 and October 15 of each year. On October 4, 2021, Holdings issued $ 1,000.0 million of 31 year senior notes with an interest coupon rate of 3.125%, which will mature on October 15, 2052. Interest is paid semi-annually on April 15 and October 15 of each year. Interest expense incurred in connection with these senior notes is as follows for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, (Dollars In thousands 2021 2020 2021 2020 Interest expense incurred 4.868% Senior notes $ 4,868 $ 4,868 $ 14,604 $ 14,604 Interest expense incurred 3.5% Senior notes 8,805 - 26,415 -

Long Term Subordinated Notes

Long Term Subordinated Notes	9 Months Ended
	Sep. 30, 2021
Long Term Subordinated Notes [Abstract]
Long Term Subordinated Notes	12. 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 September 30, 2021 December 31, 2020 Original Consolidated Balance Market Consolidated Balance Market (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Value Sheet Amount Value Long term subordinated notes 4/26/2007 $ 400,000 5/15/2037 5/1/2067 $ 223,749 $ 216,043 $ 223,674 $ 206,447 During the fixed rate interest period from May 3, 2007 through May 14, 2017, interest was at the annual rate of 6.6%, payable semi-annually in arrears on November 15 and May 15 of each year, commencing on November 15, 2007. During the floating rate interest period from May 15, 2017 through maturity, interest will be based on the 3 month LIBOR plus 238.5 basis points, reset quarterly, payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year, subject to Holdings’ right to defer interest on one or more occasions for up to ten 2.51%. 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. The Company repurchased and retired $ 0 million and $ 13.2 million of its outstanding long term subordinated notes during the three and nine months ended September 30, 2020, respectively. The Company realized a gain of $ 0 million and $ 2.5 million from the repurchase of the long term subordinated notes for the three and nine months ended September 30, 2020, respectively. No repurchases of debt were made during the three and nine months ended September 30, 2021. 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 $ 161.4 million. In addition, during 2020, the Company repurchased and retired $ 13.2 million of the notes. Interest expense incurred in connection with these long term subordinated notes is as follows for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Interest expense incurred $ 1,456 $ 1,587 $ 4,378 $ 6,126

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	13. SEGMENT REPORTING The Reinsurance operation writes worldwide property and casualty reinsurance and specialty lines of business, on both a treaty and facultative basis, through reinsurance brokers, as well as directly with ceding companies. Business is written in the U.S., Bermuda, and Ireland offices, as well as, through branches in Canada, Singapore, the United Kingdom and Switzerland. The Insurance operation writes property and casualty insurance directly and through brokers, surplus lines brokers and general agents within the U.S., Bermuda, Canada and Europe through its offices in the U.S., Canada, United Kingdom, Ireland and a branch in the Netherlands. 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. The Company measures its 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. 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 Nine Months Ended Reinsurance September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Gross written premiums $ 2,488,344 $ 2,086,961 $ 6,695,594 $ 5,403,080 Net written premiums 2,292,957 1,936,851 6,265,825 4,974,034 Premiums earned $ 1,976,454 $ 1,669,257 $ 5,674,707 $ 4,656,733 Incurred losses and LAE 1,766,197 1,335,048 4,206,243 3,361,367 Commission and brokerage 471,079 373,251 1,353,062 1,130,946 Other underwriting expenses 45,347 51,333 144,408 135,170 Underwriting gain (loss) $ ( 306,170) $ ( 90,375) $ ( 29,006) $ 29,250 Three Months Ended Nine Months Ended Insurance September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Gross written premiums $ 1,009,264 $ 704,643 $ 2,923,587 $ 2,328,733 Net written premiums 732,832 511,829 2,123,311 1,693,603 Premiums earned $ 679,949 $ 536,554 $ 1,927,933 $ 1,628,297 Incurred losses and LAE 508,103 401,162 1,365,619 1,212,699 Commission and brokerage 93,256 72,081 258,033 229,224 Other underwriting expenses 95,802 87,542 279,817 250,695 Underwriting gain (loss) $ ( 17,213) $ ( 24,231) $ 24,465 $ ( 64,321) 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Underwriting gain (loss) $ ( 323,383) $ ( 114,606) $ ( 4,541) $ ( 35,071) Net investment income 292,759 234,233 960,267 420,116 Net realized capital gains (losses) ( 4,222) 110,203 138,789 84,263 Corporate expenses ( 17,817) ( 10,618) ( 46,363) ( 29,184) Interest, fee and bond issue cost amortization expense ( 15,539) ( 6,641) ( 46,785) ( 21,477) Other income (expense) ( 19,517) 59,937 44,190 47,306 Income (loss) before taxes $ ( 87,719) $ 272,508 $ 1,045,557 $ 465,953 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 United Kingdom gross written premium $ 281,645 $ 314,502 $ 897,107 $ 857,310 No other country represented more than 5% of the Company’s revenues.

Share-Based Compensation Plans

Share-Based Compensation Plans	9 Months Ended
	Sep. 30, 2021
Share-Based Compensation Plans [Abstract]
Share-Based Compensation Plans	14. SHARE-BASED COMPENSATION PLANS For the three months ended September 30, 2021, a total of 2,090 restricted stock awards were granted: 2,090 restricted share awards were granted on September 9, 2021 with a fair value of $ 263.63 per share. For the nine months ended September 30, 2021, a total of 209,631 restricted stock awards were granted: 194,610, 10,656, 2,275 and 2,090 restricted share awards were granted on February 23, 2021, February 24, 2021, May 12, 2021 and September 9, 2021, with a fair value of $ 242.24 per share, $ 244.445 per share, $ 264.845 per share and $ 263.63 per share, respectively. Additionally, 22,205 performance share unit awards were granted on February 23, 2021, with a fair value of $ 242.24 per unit.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Taxes [Abstract]
Income Taxes	15. INCOME TAXES The Company is domiciled in Bermuda and has significant subsidiaries and/or branches in Canada, Ireland, the Netherlands, 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. 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	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENTS The Company has evaluated known recognized and non-recognized subsequent events. Other than the debt issuance on October 4, 2021 described in Note 11, the Company does not have any subsequent events to report.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At September 30, 2021 Amortized Allowance for Unrealized Unrealized Market (Dollars in thousands) Cost Credit Losses Appreciation Depreciation Value Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,344,813 $ - $ 28,332 $ ( 10,323) $ 1,362,822 Obligations of U.S. states and political subdivisions 578,289 ( 151) 31,295 ( 1,058) 608,375 Corporate securities 7,315,144 ( 22,890) 254,723 ( 52,736) 7,494,241 Asset-backed securities 3,284,025 ( 7,679) 32,405 ( 3,499) 3,305,252 Mortgage-backed securities Commercial 1,042,504 - 49,729 ( 4,363) 1,087,870 Agency residential 2,208,540 - 45,876 ( 8,415) 2,246,001 Non-agency residential 7,316 - 11 ( 21) 7,306 Foreign government securities 1,428,105 - 54,778 ( 27,738) 1,455,145 Foreign corporate securities 3,974,020 ( 1,260) 129,296 ( 45,949) 4,056,107 Total fixed maturity securities $ 21,182,756 $ ( 31,980) $ 626,445 $ ( 154,102) $ 21,623,119 At December 31, 2020 Amortized Allowance for Unrealized Unrealized Market (Dollars in thousands) Cost Credit Losses Appreciation Depreciation Value Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,325,156 $ - $ 49,084 $ ( 7,134) $ 1,367,106 Obligations of U.S. states and political subdivisions 543,895 - 34,654 ( 1,254) 577,295 Corporate securities 6,824,800 ( 1,220) 380,677 ( 55,231) 7,149,026 Asset-backed securities 2,540,809 - 30,691 ( 5,698) 2,565,802 Mortgage-backed securities Commercial 915,923 - 75,275 ( 895) 990,303 Agency residential 2,206,139 - 64,663 ( 3,063) 2,267,739 Non-agency residential 5,187 - 9 ( 2) 5,194 Foreign government securities 1,565,260 ( 22) 102,587 ( 22,450) 1,645,375 Foreign corporate securities 3,297,898 ( 503) 204,023 ( 29,085) 3,472,333 Total fixed maturity securities $ 19,225,067 $ ( 1,745) $ 941,663 $ ( 124,812) $ 20,040,173
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At September 30, 2021 At December 31, 2020 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,621,263 $ 1,621,541 $ 1,365,793 $ 1,374,674 Due after one year through five years 6,675,763 6,826,936 6,529,189 6,774,785 Due after five years through ten years 4,918,975 5,069,884 4,414,211 4,751,903 Due after ten years 1,424,370 1,458,329 1,247,816 1,309,773 Asset-backed securities 3,284,025 3,305,252 2,540,809 2,565,802 Mortgage-backed securities: Commercial 1,042,504 1,087,870 915,923 990,303 Agency residential 2,208,540 2,246,001 2,206,139 2,267,739 Non-agency residential 7,316 7,306 5,187 5,194 Total fixed maturity securities $ 21,182,756 $ 21,623,119 $ 19,225,067 $ 20,040,173
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities and short-term investments $ ( 108,789) $ 55,587 $ ( 344,370) $ 392,640 Change in unrealized appreciation (depreciation), pre-tax ( 108,789) 55,587 ( 344,370) 392,640 Deferred tax benefit (expense) 7,380 ( 3,560) 36,441 ( 44,116) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders’ equity $ ( 101,409) $ 52,027 $ ( 307,929) $ 348,524
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type	Duration of Unrealized Loss at September 30, 2021 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 $ 381,357 $ ( 6,369) $ 57,084 $ ( 3,954) $ 438,441 $ ( 10,323) Obligations of U.S. states and political subdivisions 61,687 ( 937) 3,569 ( 121) 65,256 ( 1,058) Corporate securities 1,559,623 ( 32,541) 399,617 ( 20,195) 1,959,240 ( 52,736) Asset-backed securities 610,425 ( 3,131) 23,396 ( 368) 633,821 ( 3,499) Mortgage-backed securities Commercial 108,367 ( 3,138) 26,144 ( 1,225) 134,511 ( 4,363) Agency residential 814,318 ( 5,631) 134,746 ( 2,784) 949,064 ( 8,415) Non-agency residential 2,742 ( 19) 156 ( 2) 2,898 ( 21) Foreign government securities 382,570 ( 22,491) 58,238 ( 5,247) 440,808 ( 27,738) Foreign corporate securities 1,221,503 ( 34,080) 183,579 ( 11,869) 1,405,082 ( 45,949) Total fixed maturity securities $ 5,142,592 $ ( 108,337) $ 886,529 $ ( 45,765) $ 6,029,121 $ ( 154,102) Duration of Unrealized Loss at December 31, 2020 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 $ 135,190 $ ( 7,134) $ - $ - $ 135,190 $ ( 7,134) Obligations of U.S. states and political subdivisions 19,524 ( 999) 4,059 ( 255) 23,583 ( 1,254) Corporate securities 669,755 ( 26,159) 247,962 ( 29,072) 917,717 ( 55,231) Asset-backed securities 235,566 ( 4,768) 85,595 ( 930) 321,161 ( 5,698) Mortgage-backed securities Commercial 53,511 ( 578) 6,592 ( 317) 60,103 ( 895) Agency residential 434,447 ( 2,016) 50,353 ( 1,047) 484,800 ( 3,063) Non-agency residential 185 ( 2) - - 185 ( 2) Foreign government securities 114,755 ( 8,813) 150,812 ( 13,637) 265,567 ( 22,450) Foreign corporate securities 354,548 ( 17,489) 115,595 ( 11,596) 470,143 ( 29,085) Total fixed maturity securities $ 2,017,481 $ ( 67,958) $ 660,968 $ ( 56,854) $ 2,678,449 $ ( 124,812)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity	Duration of Unrealized Loss at September 30, 2021 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 178,193 $ ( 6,982) $ 150,934 $ ( 11,210) $ 329,127 $ ( 18,192) Due in one year through five years 1,494,463 ( 33,475) 381,773 ( 17,997) 1,876,236 ( 51,472) Due in five years through ten years 1,466,402 ( 45,526) 123,239 ( 9,696) 1,589,641 ( 55,222) Due after ten years 467,682 ( 10,435) 46,141 ( 2,483) 513,823 ( 12,918) Asset-backed securities 610,425 ( 3,131) 23,396 ( 368) 633,821 ( 3,499) Mortgage-backed securities 925,427 ( 8,788) 161,046 ( 4,011) 1,086,473 ( 12,799) Total fixed maturity securities $ 5,142,592 $ ( 108,337) $ 886,529 $ ( 45,765) $ 6,029,121 $ ( 154,102) Duration of Unrealized Loss at December 31, 2020 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 $ 96,144 $ ( 4,942) $ 112,419 $ ( 12,071) $ 208,563 $ ( 17,013) Due in one year through five years 653,816 ( 32,469) 283,866 ( 21,319) 937,682 ( 53,788) Due in five years through ten years 422,517 ( 19,392) 49,749 ( 2,034) 472,266 ( 21,426) Due after ten years 121,295 ( 3,791) 72,394 ( 19,136) 193,689 ( 22,927) Asset-backed securities 235,566 ( 4,768) 85,595 ( 930) 321,161 ( 5,698) Mortgage-backed securities 488,143 ( 2,596) 56,945 ( 1,364) 545,088 ( 3,960) Total fixed maturity securities $ 2,017,481 $ ( 67,958) $ 660,968 $ ( 56,854) $ 2,678,449 $ ( 124,812)
Summary Of Components Of Net Investment Income	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Fixed maturities $ 134,157 $ 136,104 $ 423,335 $ 407,946 Equity securities 3,774 4,402 12,105 11,585 Short-term investments and cash 82 494 1,035 4,356 Other invested assets: Limited partnerships 138,718 88,778 493,017 22,092 Other 30,954 14,742 62,828 ( 1,291) Gross investment income before adjustments 307,685 244,520 992,320 444,688 Funds held interest income (expense) 1,196 684 12,449 10,921 Future policy benefit reserve income (expense) ( 272) ( 291) ( 733) ( 805) Gross investment income 308,609 244,913 1,004,036 454,804 Investment expenses ( 15,850) ( 10,680) ( 43,769) ( 34,688) Net investment income $ 292,759 $ 234,233 $ 960,267 $ 420,116
Summary Of Components Of Net Realized Capital Gains (Losses)	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Fixed maturity securities, market value: Allowance for credit losses $ ( 7,329) $ 6,196 $ ( 30,234) $ ( 19,641) Gains (losses) from sales 6,219 5,398 25,453 941 Fixed maturity securities, fair value: Gains (losses) from sales - ( 1,968) - ( 1,968) Gains (losses) from fair value adjustments - 3,339 - 1,944 Equity securities, fair value: Gains (losses) from sales ( 489) ( 1,317) 9,504 ( 12,642) Gains (losses) from fair value adjustments ( 4,542) 96,673 128,039 114,364 Other invested assets 1,920 1,084 6,014 50 Short-term investments gain (loss) - 798 13 1,215 Total net realized capital gains (losses) $ ( 4,222) $ 110,203 $ 138,789 $ 84,263 (Some amounts may not reconcile due to rounding.) Roll Forward of Allowance for Credit Losses Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Obligations of Obligations of U.S. States Foreign Foreign U.S. States Foreign Foreign Corporate Asset-Backed and Political Government Corporate Corporate Asset-Backed and Political Government Corporate Securities Securities Subdivisions Securities Securities Total Securities Securities Subdivisions Securities Securities Total (Dollars in thousands) Beginning Balance $ ( 18,475) $ ( 4,915) $ - $ - $ ( 1,260) $ ( 24,650) $ ( 1,220) $ - $ - $ ( 22) $ ( 503) $ ( 1,745) Credit losses on securities where credit losses were not previously recorded ( 5,257) ( 151) - - ( 5,408) ( 21,177) ( 4,915) ( 151) - ( 1,055) ( 27,298) Increases in allowance on previously impaired securities ( 620) ( 2,764) - - - ( 3,384) ( 2,088) ( 2,764) - - - ( 4,852) Decreases in allowance on previously impaired securities - - - - - - - - - - - - Reduction in allowance due to disposals 1,462 - - - - 1,462 1,595 - - 22 298 1,915 Balance as of September 30, 2021 $ ( 22,890) $ ( 7,679) $ ( 151) $ - $ ( 1,260) $ ( 31,980) $ ( 22,890) $ ( 7,679) $ ( 151) $ - $ ( 1,260) $ ( 31,980) Roll Forward of Allowance for Credit Losses Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Foreign Foreign Foreign Foreign Corporate Government Corporate Corporate Government Corporate Securities Securities Securities Total Securities Securities Securities Total (Dollars in thousands) Beginning Balance $ ( 22,253) $ ( 92) $ ( 3,492) $ ( 25,837) $ - $ - $ - $ - Credit losses on securities where credit losses were not previously recorded ( 6) - ( 144) ( 150) ( 27,666) ( 519) ( 4,699) ( 32,884) Increases in allowance on previously - impaired securities ( 5,354) ( 27) ( 181) ( 5,562) ( 6,136) ( 27) ( 481) ( 6,644) Decreases in allowance on previously impaired securities 159 - 151 310 3,590 212 844 4,646 Reduction in allowance due to disposals 9,980 - 1,618 11,598 12,738 215 2,288 15,241 Balance as of September 30, 2020 $ ( 17,474) $ ( 119) $ ( 2,048) $ ( 19,641) $ ( 17,474) $ ( 119) $ ( 2,048) $ ( 19,641)
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Proceeds from sales of fixed maturity securities $ 283,412 $ 402,528 $ 883,149 $ 1,392,801 Gross gains from sales 17,004 18,721 51,738 54,077 Gross losses from sales ( 10,785) ( 15,291) ( 26,285) ( 55,104) Proceeds from sales of equity securities $ 104,231 $ 116,565 $ 578,894 $ 329,750 Gross gains from sales 2,768 9,512 20,875 30,268 Gross losses from sales ( 3,257) ( 10,829) ( 11,371) ( 42,910)

Reserve For Losses, LAE And F_2

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	9 Months Ended
	Sep. 30, 2021
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	Nine Months Ended September 30, (Dollars in thousands) 2021 2020 Gross reserves beginning of period $ 16,398,997 $ 13,611,313 Less reinsurance recoverables on unpaid losses ( 1,843,691) ( 1,640,712) Net reserves beginning of period 14,555,306 11,970,601 Incurred related to: Current year 5,577,911 4,572,640 Prior years ( 6,050) 1,426 Total incurred losses and LAE 5,571,861 4,574,066 Paid related to: Current year 1,375,665 1,015,538 Prior years 1,786,393 2,042,712 Total paid losses and LAE 3,162,058 3,058,250 Foreign exchange/translation adjustment ( 41,000) ( 28,024) Net reserves end of period 16,924,109 13,458,393 Plus reinsurance recoverables on unpaid losses 2,032,844 1,774,732 Gross reserves end of period $ 18,956,953 $ 15,233,125 (Some amounts may not reconcile due to rounding.)

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2021
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) September 30, 2021 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,362,822 $ - $ 1,362,822 $ - Obligations of U.S. States and political subdivisions 608,375 - 608,375 - Corporate securities 7,494,241 - 6,700,200 794,041 Asset-backed securities 3,305,252 - 2,301,183 1,004,069 Mortgage-backed securities Commercial 1,087,870 - 1,087,870 - Agency residential 2,246,001 - 2,246,001 - Non-agency residential 7,306 - 7,306 - Foreign government securities 1,455,145 - 1,455,145 - Foreign corporate securities 4,056,107 - 4,051,232 4,875 Total fixed maturities, market value 21,623,119 - 19,820,134 1,802,985 Equity securities, fair value 1,523,595 1,451,271 72,324 - Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2020 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,367,106 $ - $ 1,367,106 $ - Obligations of U.S. States and political subdivisions 577,295 - 577,295 - Corporate securities 7,149,026 - 6,447,534 701,492 Asset-backed securities 2,565,802 - 1,942,769 623,033 Mortgage-backed securities Commercial 990,303 - 990,303 - Agency residential 2,267,739 - 2,267,739 - Non-agency residential 5,194 - 5,194 - Foreign government securities 1,645,375 - 1,645,375 - Foreign corporate securities 3,472,333 - 3,466,634 5,699 Total fixed maturities, market value 20,040,173 - 18,709,949 1,330,224 Equity securities, fair value 1,472,236 1,368,704 103,532 -
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	Total Fixed Maturities, Market Value Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Corporate Asset-Backed Foreign Corporate Asset-Backed Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Securities Corporate Total Beginning balance fixed maturities at market value $ 705,571 $ 815,276 $ 4,887 $ 1,525,734 $ 701,492 $ 623,033 $ 5,699 $ 1,330,224 Total gains or (losses) (realized/unrealized) Included in earnings 3,184 ( 3,292) 33 ( 75) ( 12,366) ( 7,254) 173 ( 19,447) Included in other comprehensive income (loss) ( 1,311) ( 381) ( 34) ( 1,726) 6,107 4,094 ( 70) 10,131 Purchases, issuances and settlements 86,597 192,466 ( 12) 279,051 98,808 384,196 ( 928) 482,076 Transfers in and/or (out) of Level 3 - - - - - - - - Ending balance $ 794,041 $ 1,004,069 $ 4,875 $ 1,802,984 $ 794,041 $ 1,004,069 $ 4,875 $ 1,802,984 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 $ 761 $ ( 2,764) $ - $ ( 2,003) $ ( 16,518) $ ( 7,679) $ - $ ( 24,197) (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Corporate Asset-Backed Foreign Corporate Asset-Backed Foreign (Dollars in thousands) Securities Securities Corporate Total Securities Securities Corporate Total Beginning balance fixed maturities at market value $ 721,834 $ 295,730 $ 6,274 $ 1,023,838 $ 617,588 $ 153,641 $ 1,750 $ 772,979 Total gains or (losses) (realized/unrealized) Included in earnings 362 457 26 845 ( 100) 582 ( 71) 411 Included in other comprehensive income (loss) ( 992) 5,028 126 4,162 ( 4,898) 7,238 86 2,426 Purchases, issuances and settlements ( 1,349) 103,574 139 102,364 112,060 243,328 3,823 359,211 Transfers in and/or (out) of Level 3 4,189 - ( 863) 3,326 ( 606) - 114 ( 492) Ending balance $ 724,044 $ 404,789 $ 5,702 $ 1,134,535 $ 724,044 $ 404,789 $ 5,702 $ 1,134,535 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 $ - $ - $ - $ - $ ( 539) $ - $ - $ ( 539) (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at market value $ 4,431 $ 4,431 $ 5,826 $ 5,826 Total gains or (losses) (realized/unrealized) Included in earnings 1,371 1,371 ( 24) ( 24) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements ( 2,054) ( 2,054) ( 2,054) ( 2,054) Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,748 $ 3,748 $ 3,748 $ 3,748 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 Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Common Stock Balance, beginning of period $ - $ 9,877 $ - $ - Total (gains) or losses (realized/unrealized) Included in earnings - - - - Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - 9,877 Transfers in and/or (out) of Level 3 - ( 9,877) - ( 9,877) Balance, end of period $ - $ - $ - $ - 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)	9 Months Ended
	Sep. 30, 2021
Earnings Per Common Share [Abstract]
Schedule Of Net Income (Loss) Per Common Share	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands, except per share amounts) 2021 2020 2021 2020 Net income (loss) per share: Numerator Net income (loss) $ ( 73,468) $ 243,057 $ 948,376 $ 450,549 Less: dividends declared-common shares and unvested common shares ( 61,457) ( 61,910) ( 185,731) ( 187,115) Undistributed earnings ( 134,925) 181,148 762,646 263,435 Percentage allocated to common shareholders (1) 100.0 % 98.8 % 98.7 % 98.7 % ( 134,925) 178,938 752,414 260,096 Add: dividends declared-common shareholders 61,457 61,199 183,333 184,836 Numerator for basic and diluted earnings per common share $ ( 73,468) $ 240,138 $ 935,748 $ 444,931 Denominator Denominator for basic earnings per weighted-average common shares 39,161 39,483 39,409 39,711 Effect of dilutive securities: Options 36 74 44 79 Denominator for diluted earnings per adjusted weighted-average common shares 39,197 39,557 39,452 39,790 Per common share net income (loss) Basic $ ( 1.88) $ 6.08 $ 23.74 $ 11.20 Diluted $ ( 1.88) $ 6.07 $ 23.72 $ 11.18 (1) Basic weighted-average common shares outstanding 39,161 39,483 39,409 39,711 Basic weighted-average common shares outstanding and unvested common shares expected to vest 39,161 39,971 39,945 40,221 Percentage allocated to common shareholders 100.0 % 98.8 % 98.7 % 98.7 % (Some amounts may not reconcile due to rounding.)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At September 30, At December 31, (Dollars in thousands) 2021 2020 The Prudential $ 138,869 $ 140,773 Unaffiliated life insurance company 34,163 35,128

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Other Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Three Months Ended September 30, 2021 Nine Months Ended September 30, 2021 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related $ ( 107,980) $ 7,959 $ ( 100,021) $ ( 343,137) $ 38,672 $ ( 304,465) Reclassification of net realized losses (gains) included in net income (loss) ( 809) ( 579) ( 1,388) ( 1,233) ( 2,231) ( 3,464) Foreign currency translation adjustments ( 59,094) 5,495 ( 53,599) ( 30,060) 1,174 ( 28,886) Reclassification of benefit plan liability amortization included in net income (loss) 1,979 ( 416) 1,563 7,151 ( 1,502) 5,649 Total other comprehensive income (loss) $ ( 165,904) $ 12,459 $ ( 153,445) $ ( 367,279) $ 36,113 $ ( 331,166) Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related $ 68,264 $ ( 4,784) $ 63,480 $ 373,990 $ ( 38,155) $ 335,835 Reclassification of net realized losses (gains) included in net income (loss) ( 12,678) 1,225 ( 11,453) 18,650 ( 5,961) 12,689 Foreign currency translation adjustments 64,453 ( 3,825) 60,628 28,555 1,835 30,390 Reclassification of benefit plan liability amortization included in net income (loss) 2,285 ( 479) 1,806 5,736 ( 1,204) 4,532 Total other comprehensive income (loss) $ 122,324 $ ( 7,863) $ 114,461 $ 426,931 $ ( 43,485) $ 383,446
Reclassification From Accumulated Other Comprehensive Income	Three Months Ended Nine Months Ended September 30, September 30, Affected line item within the statements of AOCI component 2021 2020 2021 2020 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ ( 809) $ ( 12,678) $ ( 1,233) $ 18,650 Other net realized capital gains (losses) ( 579) 1,225 ( 2,231) ( 5,961) Income tax expense (benefit) $ ( 1,388) $ ( 11,453) $ ( 3,464) $ 12,689 Net income (loss) Benefit plan net gain (loss) $ 1,979 $ 2,285 $ 7,151 $ 5,736 Other underwriting expenses ( 416) ( 479) ( 1,502) ( 1,204) Income tax expense (benefit) $ 1,563 $ 1,806 $ 5,649 $ 4,532 Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Beginning balance of URA (D) on securities $ 517,639 $ 600,922 $ 724,159 $ 304,425 Current period change in URA (D) of investments - non-credit related ( 101,409) 52,027 ( 307,929) 348,524 Ending balance of URA (D) on securities 416,230 652,949 416,230 652,949 Beginning balance of foreign currency translation adjustments ( 90,677) ( 231,955) ( 115,390) ( 201,717) Current period change in foreign currency translation adjustments ( 53,599) 60,628 ( 28,886) 30,390 Ending balance of foreign currency translation adjustments ( 144,276) ( 171,327) ( 144,276) ( 171,327) Beginning balance of benefit plan net gain (loss) ( 69,784) ( 71,830) ( 73,870) ( 74,556) Current period change in benefit plan net gain (loss) 1,563 1,806 5,649 4,532 Ending balance of benefit plan net gain (loss) ( 68,221) ( 70,024) ( 68,221) ( 70,024) Ending balance of accumulated other comprehensive income (loss) $ 203,733 $ 411,598 $ 203,733 $ 411,598 (Some amounts may not reconcile due to rounding.)

Credit Facilities (Tables)

Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2021
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Credit facility interest and fees incurred $ - $ 105 $ 175 $ 560 Loan interest and fees incurred - Federal Home Loan Bank 281 27 827 27 Total interest and fees incurred $ 281 $ 132 $ 1,002 $ 587
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ - $ - $ 200,000 $ 164,242 12/31/2021 Tranche Two 600,000 402,284 12/31/2021 600,000 589,690 12/31/2021 Total Wells Fargo Bank Group Credit Facility $ 600,000 $ 402,284 $ 800,000 $ 753,932
Wells Fargo Bank Bilateral Loc Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At September 30, 2021 Bank Commitment In Use Date of Expiry Wells Fargo Bank Bilateral LOC Agreement $ 500,000 $ 404,157 12/31/2021 $ 500,000 $ 404,157
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 230,000 $ 1,264 11/24/2021 $ 200,000 $ 4,425 02/28/2021 429 12/16/2021 3,672 11/24/2021 139,887 12/31/2021 448 12/16/2021 4,425 02/28/2022 115 12/20/2021 838 03/01/2022 136,383 12/31/2021 148 12/20/2022 39,619 12/30/2024 28,498 12/31/2022 821 08/15/2022 999 08/15/2023 - 1,252 09/23/2023 - 22,964 09/30/2025 - Total Citibank Bilateral Agreement $ 230,000 $ 200,704 $ 200,000 $ 185,483
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At September 30, 2021 At December 31, 2020 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 52,175 £ 52,175 12/31/2024 £ 52,175 £ 52,175 12/31/2023 Total Lloyd's Bank Credit Facility £ 52,175 £ 52,175 £ 52,175 £ 52,175
Bayerische Landesbank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And Borrowings	(Dollars in thousands) At September 30, 2021 Bank Commitment In Use Date of Expiry Bayerische Landesbank Bilateral Letter of Credit Agreement $ 200,000 $ - Total Bayerische Landesbank Bilateral Agreement $ 200,000 $ -

Collateralized Reinsurance An_2

Collateralized Reinsurance And Trust Agreements (Tables)	9 Months Ended
	Sep. 30, 2021
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Three Months Ended Nine Months Ended September 30, September 30, Mt. Logan Re Segregated Accounts 2021 2020 2021 2020 (Dollars in thousands) Ceded written premiums $ 114,694 $ 86,712 $ 269,987 $ 245,422 Ceded earned premiums 100,133 71,396 249,662 233,089 Ceded losses and LAE 169,998 87,917 281,893 173,968 Assumed written premiums 4,273 8,894 9,490 14,448 Assumed earned premiums 4,273 8,894 9,490 14,448 Assumed losses and LAE - - - -
Summary of Collateralized Reinsurance Agreements	(Dollars in thousands) Class Description Effective Date Expiration Date Limit Coverage Basis Series 2017-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 50,000 Aggregate Series 2017-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 75,000 Aggregate Series 2017-1 Class C-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/13/2017 4/13/2022 175,000 Aggregate Series 2018-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/6/2022 62,500 Aggregate Series 2018-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/6/2022 200,000 Aggregate Series 2018-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 62,500 Aggregate Series 2018-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 200,000 Aggregate Series 2019-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 150,000 Occurrence Series 2019-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 275,000 Aggregate Series 2019-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 150,000 Occurrence Series 2019-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 275,000 Aggregate Series 2021-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 150,000 Occurrence Series 2021-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85,000 Aggregate Series 2021-1 Class C-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85,000 Aggregate Series 2021-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 150,000 Occurrence Series 2021-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90,000 Aggregate Series 2021-1 Class C-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90,000 Aggregate Total available limit as of September 30, 2021 $ 2,325,000
Schedule of Proceeds from Issuance of Notes Held in Reinsurance Trusts	(Dollars in thousands) Note Series Issue Date Maturity Date Amount Series 2017-1 Class A-2 4/13/2017 4/13/2022 $ 50,000 Series 2017-1 Class B-2 4/13/2017 4/13/2022 75,000 Series 2017-1 Class C-2 4/13/2017 4/13/2022 175,000 Series 2018-1 Class A-1 4/30/2018 5/6/2022 62,500 Series 2018-1 Class B-1 4/30/2018 5/6/2022 200,000 Series 2018-1 Class A-2 4/30/2018 5/5/2023 62,500 Series 2018-1 Class B-2 4/30/2018 5/5/2023 200,000 Series 2019-1 Class A-1 12/12/2019 12/19/2023 150,000 Series 2019-1 Class B-1 12/12/2019 12/19/2023 275,000 Series 2019-1 Class A-2 12/12/2019 12/19/2024 150,000 Series 2019-1 Class B-2 12/12/2019 12/19/2024 275,000 Series 2021-1 Class A-1 4/8/2021 4/21/2025 150,000 Series 2021-1 Class B-1 4/8/2021 4/21/2025 85,000 Series 2021-1 Class C-1 4/8/2021 4/21/2025 85,000 Series 2021-1 Class A-2 4/8/2021 4/20/2026 150,000 Series 2021-1 Class B-2 4/8/2021 4/20/2026 90,000 Series 2021-1 Class C-2 4/8/2021 4/20/2026 90,000

Senior Notes (Tables)

Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2021
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	September 30, 2021 December 31, 2020 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868% Senior notes 6/5/2014 6/1/2044 400,000 $ 397,284 $ 506,828 $ 397,194 $ 528,000 3.5% Senior notes 10/07/2020 10/15/2050 1,000,000 979,915 1,065,400 979,524 1,138,100
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars In thousands 2021 2020 2021 2020 Interest expense incurred 4.868% Senior notes $ 4,868 $ 4,868 $ 14,604 $ 14,604 Interest expense incurred 3.5% Senior notes 8,805 - 26,415 -

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	9 Months Ended
	Sep. 30, 2021
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date September 30, 2021 December 31, 2020 Original Consolidated Balance Market Consolidated Balance Market (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Value Sheet Amount Value Long term subordinated notes 4/26/2007 $ 400,000 5/15/2037 5/1/2067 $ 223,749 $ 216,043 $ 223,674 $ 206,447
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Interest expense incurred $ 1,456 $ 1,587 $ 4,378 $ 6,126

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended Nine Months Ended Reinsurance September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Gross written premiums $ 2,488,344 $ 2,086,961 $ 6,695,594 $ 5,403,080 Net written premiums 2,292,957 1,936,851 6,265,825 4,974,034 Premiums earned $ 1,976,454 $ 1,669,257 $ 5,674,707 $ 4,656,733 Incurred losses and LAE 1,766,197 1,335,048 4,206,243 3,361,367 Commission and brokerage 471,079 373,251 1,353,062 1,130,946 Other underwriting expenses 45,347 51,333 144,408 135,170 Underwriting gain (loss) $ ( 306,170) $ ( 90,375) $ ( 29,006) $ 29,250 Three Months Ended Nine Months Ended Insurance September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Gross written premiums $ 1,009,264 $ 704,643 $ 2,923,587 $ 2,328,733 Net written premiums 732,832 511,829 2,123,311 1,693,603 Premiums earned $ 679,949 $ 536,554 $ 1,927,933 $ 1,628,297 Incurred losses and LAE 508,103 401,162 1,365,619 1,212,699 Commission and brokerage 93,256 72,081 258,033 229,224 Other underwriting expenses 95,802 87,542 279,817 250,695 Underwriting gain (loss) $ ( 17,213) $ ( 24,231) $ 24,465 $ ( 64,321)
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 Underwriting gain (loss) $ ( 323,383) $ ( 114,606) $ ( 4,541) $ ( 35,071) Net investment income 292,759 234,233 960,267 420,116 Net realized capital gains (losses) ( 4,222) 110,203 138,789 84,263 Corporate expenses ( 17,817) ( 10,618) ( 46,363) ( 29,184) Interest, fee and bond issue cost amortization expense ( 15,539) ( 6,641) ( 46,785) ( 21,477) Other income (expense) ( 19,517) 59,937 44,190 47,306 Income (loss) before taxes $ ( 87,719) $ 272,508 $ 1,045,557 $ 465,953
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2021 2020 2021 2020 United Kingdom gross written premium $ 281,645 $ 314,502 $ 897,107 $ 857,310

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Additional contractual commitments	$ 2,648,100,000
Contractual commitments, investment period expiration date	Dec. 31, 2026
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	$ 6,029,121,000	$ 2,678,449,000
Gross unrealized losses on investments in unrealized loss position	154,102,000	124,812,000
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	108,337,000	67,958,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	45,765,000	56,854,000
Fixed maturities, fair value	$ 21,623,119,000	$ 20,040,173,000
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | Issuer with the second the largest unrealized loss position [Member] | Issuer [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	0.60%	0.10%
Fixed Maturity Securities [Member] | US Government Securities [Member] | Sales Revenue, Net [Member] | Issuer [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	1.70%	0.70%
Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	$ 101,600,000	$ 63,400,000
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	43,400,000	33,500,000
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]
Fixed maturities, fair value	$ 429,700,000

Investments (Summary Of Unreali

Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 21,182,756		$ 19,225,067
Allowance for credit losses	(31,980)	$ (24,650)	(1,745)	$ (19,641)	$ (25,837)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,182,756		19,225,067
Allowance for credit losses	(31,980)		(1,745)
Unrealized Appreciation	626,445		941,663
Unrealized Depreciation	(154,102)		(124,812)
Market Value	21,623,119		20,040,173
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,344,813		1,325,156
Allowance for credit losses
Unrealized Appreciation	28,332		49,084
Unrealized Depreciation	(10,323)		(7,134)
Market Value	1,362,822		1,367,106
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	578,289		543,895
Allowance for credit losses	(151)
Unrealized Appreciation	31,295		34,654
Unrealized Depreciation	(1,058)		(1,254)
Market Value	608,375		577,295
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,315,144		6,824,800
Allowance for credit losses	(22,890)	(18,475)	(1,220)	(17,474)	(22,253)
Unrealized Appreciation	254,723		380,677
Unrealized Depreciation	(52,736)		(55,231)
Market Value	7,494,241		7,149,026
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,284,025		2,540,809
Allowance for credit losses	(7,679)	(4,915)
Unrealized Appreciation	32,405		30,691
Unrealized Depreciation	(3,499)		(5,698)
Market Value	3,305,252		2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,042,504		915,923
Allowance for credit losses
Unrealized Appreciation	49,729		75,275
Unrealized Depreciation	(4,363)		(895)
Market Value	1,087,870		990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,208,540		2,206,139
Allowance for credit losses
Unrealized Appreciation	45,876		64,663
Unrealized Depreciation	(8,415)		(3,063)
Market Value	2,246,001		2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,316		5,187
Allowance for credit losses
Unrealized Appreciation	11		9
Unrealized Depreciation	(21)		(2)
Market Value	7,306		5,194
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,428,105		1,565,260
Allowance for credit losses			(22)	(119)	(92)
Unrealized Appreciation	54,778		102,587
Unrealized Depreciation	(27,738)		(22,450)
Market Value	1,455,145		1,645,375
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,974,020		3,297,898
Allowance for credit losses	(1,260)	$ (1,260)	(503)	$ (2,048)	$ (3,492)
Unrealized Appreciation	129,296		204,023
Unrealized Depreciation	(45,949)		(29,085)
Market Value	$ 4,056,107		$ 3,472,333

Investments (Summary Of Amortiz

Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 21,182,756	$ 19,225,067
Fixed maturity securities - available for sale, Market Value	21,623,119	20,040,173
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	1,621,263	1,365,793
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,675,763	6,529,189
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	4,918,975	4,414,211
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	1,424,370	1,247,816
Fixed maturity securities - available for sale, Amortized Cost	21,182,756	19,225,067
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,621,541	1,374,674
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,826,936	6,774,785
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	5,069,884	4,751,903
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,458,329	1,309,773
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	3,284,025	2,540,809
Fixed maturity securities - available for sale, Market Value	3,305,252	2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	1,042,504	915,923
Fixed maturity securities - available for sale, Market Value	1,087,870	990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,208,540	2,206,139
Fixed maturity securities - available for sale, Market Value	2,246,001	2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	7,316	5,187
Fixed maturity securities - available for sale, Market Value	$ 7,306	$ 5,194

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (108,789)	$ 55,587	$ (344,370)	$ 392,640
Deferred tax benefit (expense)	7,380	(3,560)	36,441	(44,116)
Total URA(D) on securities arising during the period	(101,409)	52,027	(307,929)	348,524
Fixed Maturity Securities and Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (108,789)	$ 55,587	$ (344,370)	$ 392,640

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	Sep. 30, 2021	Dec. 31, 2020
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	$ 5,142,592	$ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(108,337)	(67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	886,529	660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(45,765)	(56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	6,029,121	2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(154,102)	(124,812)
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	381,357	135,190
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(6,369)	(7,134)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	57,084
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,954)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	438,441	135,190
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(10,323)	(7,134)
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	61,687	19,524
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(937)	(999)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,569	4,059
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(121)	(255)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	65,256	23,583
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,058)	(1,254)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,559,623	669,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(32,541)	(26,159)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	399,617	247,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(20,195)	(29,072)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,959,240	917,717
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(52,736)	(55,231)
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	610,425	235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(3,131)	(4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	23,396	85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(368)	(930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	633,821	321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(3,499)	(5,698)
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	108,367	53,511
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(3,138)	(578)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	26,144	6,592
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,225)	(317)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	134,511	60,103
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(4,363)	(895)
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	814,318	434,447
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(5,631)	(2,016)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	134,746	50,353
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,784)	(1,047)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	949,064	484,800
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(8,415)	(3,063)
Mortgage Backed Securities: 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	2,742	185
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(19)	(2)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	2,898	185
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(21)	(2)
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	382,570	114,755
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(22,491)	(8,813)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	58,238	150,812
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(5,247)	(13,637)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	440,808	265,567
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(27,738)	(22,450)
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	1,221,503	354,548
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(34,080)	(17,489)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	183,579	115,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,869)	(11,596)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,405,082	470,143
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (45,949)	$ (29,085)

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	Sep. 30, 2021	Dec. 31, 2020
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	$ 5,142,592	$ 2,017,481
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(108,337)	(67,958)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	886,529	660,968
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(45,765)	(56,854)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	6,029,121	2,678,449
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(154,102)	(124,812)
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	178,193	96,144
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(6,982)	(4,942)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	150,934	112,419
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,210)	(12,071)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	329,127	208,563
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(18,192)	(17,013)
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	1,494,463	653,816
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(33,475)	(32,469)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	381,773	283,866
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(17,997)	(21,319)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,876,236	937,682
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(51,472)	(53,788)
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	1,466,402	422,517
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(45,526)	(19,392)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	123,239	49,749
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,696)	(2,034)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,589,641	472,266
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(55,222)	(21,426)
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	467,682	121,295
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(10,435)	(3,791)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	46,141	72,394
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,483)	(19,136)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	513,823	193,689
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(12,918)	(22,927)
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	610,425	235,566
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(3,131)	(4,768)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	23,396	85,595
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(368)	(930)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	633,821	321,161
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(3,499)	(5,698)
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	925,427	488,143
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(8,788)	(2,596)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	161,046	56,945
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(4,011)	(1,364)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,086,473	545,088
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (12,799)	$ (3,960)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 307,685	$ 244,520	$ 992,320	$ 444,688
Funds held interest income (expense)	1,196	684	12,449	10,921
Future policy benefit reserve income (expense)	(272)	(291)	(733)	(805)
Gross investment income	308,609	244,913	1,004,036	454,804
Investment expenses	(15,850)	(10,680)	(43,769)	(34,688)
Net investment income	292,759	234,233	960,267	420,116
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	134,157	136,104	423,335	407,946
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	3,774	4,402	12,105	11,585
Short Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	82	494	1,035	4,356
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	138,718	88,778	493,017	22,092
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 30,954	$ 14,742	$ 62,828	$ (1,291)

Investments (Summary Of Compo_2

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Total net realized capital gains (losses)	$ (4,222)	$ 110,203	$ 138,789	$ 84,263
Beginning Balance	(24,650)	(25,837)	(1,745)
Credit losses on securities where credit losses were not previously recorded	(5,408)	(150)	(27,298)	(32,884)
Increases in allowance on previously impaired securities	(3,384)	(5,562)	(4,852)	(6,644)
Decrease in allowance on previously impaired securities		310		4,646
Reduction in allowance due to disposals	1,462	11,598	1,915	15,241
Ending Balance	(31,980)	(19,641)	(31,980)	(19,641)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance			(1,745)
Ending Balance	(31,980)		(31,980)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(7,329)	6,196	(30,234)	(19,641)
Gains (losses) from sales	6,219	5,398	25,453	941
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales		(1,968)		(1,968)
Gains (losses) from fair value adjustments		3,339		1,944
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(18,475)	(22,253)	(1,220)
Credit losses on securities where credit losses were not previously recorded	(5,257)	(6)	(21,177)	(27,666)
Increases in allowance on previously impaired securities	(620)	(5,354)	(2,088)	(6,136)
Decrease in allowance on previously impaired securities		159		3,590
Reduction in allowance due to disposals	1,462	9,980	1,595	12,738
Ending Balance	(22,890)	(17,474)	(22,890)	(17,474)
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(489)	(1,317)	9,504	(12,642)
Gains (losses) from fair value adjustments	(4,542)	96,673	128,039	114,364
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	1,920	1,084	6,014	50
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales		798	13	1,215
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(4,915)
Credit losses on securities where credit losses were not previously recorded			(4,915)
Increases in allowance on previously impaired securities	(2,764)		(2,764)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals
Ending Balance	(7,679)		(7,679)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance
Credit losses on securities where credit losses were not previously recorded	(151)		(151)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals
Ending Balance	(151)		(151)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance		(92)	(22)
Credit losses on securities where credit losses were not previously recorded				(519)
Increases in allowance on previously impaired securities		(27)		(27)
Decrease in allowance on previously impaired securities				212
Reduction in allowance due to disposals			22	215
Ending Balance		(119)		(119)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(1,260)	(3,492)	(503)
Credit losses on securities where credit losses were not previously recorded		(144)	(1,055)	(4,699)
Increases in allowance on previously impaired securities		(181)		(481)
Decrease in allowance on previously impaired securities		151		844
Reduction in allowance due to disposals		1,618	298	2,288
Ending Balance	$ (1,260)	$ (2,048)	$ (1,260)	$ (2,048)

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities				$ 2,054
Proceeds from sales of equity securities			578,894	329,750
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 283,412	$ 402,528	883,149	1,392,801
Gross gains from sales	17,004	18,721	51,738	54,077
Gross losses from sales	(10,785)	(15,291)	(26,285)	(55,104)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of equity securities	116,565	104,231	329,750	578,894
Gross gains from sales	9,512	2,768	30,268	20,875
Gross losses from sales	$ (10,829)	$ (3,257)	$ (42,910)	$ (11,371)

Reserve For Losses, LAE And F_3

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses	$ 5,577,911	$ 4,572,640
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses	$ 1,010,000	355,000
Covid-19 [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses		$ 434,900

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	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves beginning of period	$ 16,398,997	$ 13,611,313
Less reinsurance recoverables on unpaid losses	(1,843,691)	(1,640,712)
Net reserves beginning of period	14,555,306	11,970,601
Incurred related to: Current year	5,577,911	4,572,640
Incurred related to: Prior years	(6,050)	1,426
Total incurred losses and LAE	5,571,861	4,574,066
Paid related to: Current year	1,375,665	1,015,538
Paid related to: Prior years	1,786,393	2,042,712
Total paid losses and LAE	3,162,058	3,058,250
Foreign exchange/translation adjustment	(41,000)	(28,024)
Net reserves end of period	16,924,109	13,458,393
Plus reinsurance recoverables on unpaid losses	2,032,844	1,774,732
Gross reserves end of period	$ 18,956,953	$ 15,233,125

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio	$ 1,253,900,000		$ 1,253,900,000		$ 784,700,000
Other invested assets	866,872,000		866,872,000		742,369,000
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3		$ 3,326,000		$ (492,000)
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	266,300,000		266,300,000		224,700,000
Fixed Maturities [Member] | Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Securities, Available-for-sale	1,803,000,000		1,803,000,000		$ 1,330,200,000
Fixed Maturities [Member] | Market Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3	$ 0	3,300,000	$ 0	(500,000)
Equity Securities [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3		$ (9,900,000)		$ (9,900,000)

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 21,623,119	$ 20,040,173
Equity securities, fair value	1,523,595	1,472,236
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, fair value	1,451,271	1,368,704
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, fair value	72,324	103,532
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, fair value
Fixed Maturity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	21,623,119	20,040,173
Fixed Maturity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Fixed Maturity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	19,820,134	18,709,949
Fixed Maturity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,802,985	1,330,224
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,362,822	1,367,106
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,362,822	1,367,106
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Obligations Of U.S. States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	608,375	577,295
Obligations Of U.S. States And Political Subdivisions [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	608,375	577,295
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	7,494,241	7,149,026
Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	6,700,200	6,447,534
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	794,041	701,492
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	3,305,252	2,565,802
Asset-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,301,183	1,942,769
Asset-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,004,069	623,033
Mortgage-Backed Securities: Commercial [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,087,870	990,303
Mortgage-Backed Securities: Commercial [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Mortgage-Backed Securities: Commercial [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,087,870	990,303
Mortgage-Backed Securities: Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Mortgage Backed Securities: Agency residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,246,001	2,267,739
Mortgage Backed Securities: Agency residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Mortgage Backed Securities: Agency residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	2,246,001	2,267,739
Mortgage Backed Securities: Agency residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Mortgage Backed Securities: Non-agency residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	7,306	5,194
Mortgage Backed Securities: Non-agency residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Mortgage Backed Securities: Non-agency residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	7,306	5,194
Mortgage Backed Securities: Non-agency residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Government Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,455,145	1,645,375
Foreign Government Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	1,455,145	1,645,375
Foreign Government Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	4,056,107	3,472,333
Foreign Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value
Foreign Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	4,051,232	3,466,634
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities - available for sale, at market value	$ 4,875	$ 5,699

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Market Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	$ 1,525,734	$ 1,023,838	$ 1,330,224	$ 772,979
Total gains or (losses) (realized/unrealized) Included in earnings	(75)	845	(19,447)	411
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(1,726)	4,162	10,131	2,426
Purchases, issuances and settlements	279,051	102,364	482,076	359,211
Transfer in and/or (out) of Level 3		3,326		(492)
Ending balance	1,802,984	1,134,535	1,802,984	1,134,535
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	(2,003)		(24,197)	(539)
Market Value [Member] | Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	705,571	721,834	701,492	617,588
Total gains or (losses) (realized/unrealized) Included in earnings	3,184	362	(12,366)	(100)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(1,311)	(992)	6,107	(4,898)
Purchases, issuances and settlements	86,597	(1,349)	98,808	112,060
Transfer in and/or (out) of Level 3		4,189		(606)
Ending balance	794,041	724,044	794,041	724,044
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	761		(16,518)	(539)
Market Value [Member] | Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	815,276	295,730	623,033	153,641
Total gains or (losses) (realized/unrealized) Included in earnings	(3,292)	457	(7,254)	582
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(381)	5,028	4,094	7,238
Purchases, issuances and settlements	192,466	103,574	384,196	243,328
Transfer in and/or (out) of Level 3
Ending balance	1,004,069	404,789	1,004,069	404,789
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	(2,764)		(7,679)
Market Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	4,887	6,274	5,699	1,750
Total gains or (losses) (realized/unrealized) Included in earnings	33	26	173	(71)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(34)	126	(70)	86
Purchases, issuances and settlements	(12)	139	(928)	3,823
Transfer in and/or (out) of Level 3		(863)		114
Ending balance	4,875	5,702	4,875	5,702
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities		4,431		5,826
Total gains or (losses) (realized/unrealized) Included in earnings		1,371		(24)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements		(2,054)		(2,054)
Transfer in and/or (out) of Level 3
Ending balance		3,748		3,748
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities		4,431		5,826
Total gains or (losses) (realized/unrealized) Included in earnings		1,371		(24)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements		(2,054)		(2,054)
Transfer in and/or (out) of Level 3
Ending balance		3,748		3,748
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date

Fair Value (Fair Value Measur_2

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - Common Stock [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period		$ 9,877
Total (gains) or losses (realized/unrealized) Included in earnings
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements				9,877
Transfers in and/or (out) of Level 3		(9,877)		(9,877)
Balance, end of period
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

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
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			Feb. 22, 2022
Maximum [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Options expiration date			Sep. 19, 2022

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Common Share [Abstract]
Net income (loss)	$ (73,468,000)	$ 243,057,000	$ 948,376,000	$ 450,549,000
Less: dividends declared-common shares and unvested common shares	(61,457,000)	(61,910,000)	(185,731,000)	(187,115,000)
Undistributed earnings	$ (134,925,000)	$ 181,148,000	$ 762,646,000	$ 263,435,000
Percentage allocated to common shareholders	100.00%	98.80%	98.70%	98.70%
Net income (loss) available to common stockholders, total	$ (134,925,000)	$ 178,938,000	$ 752,414,000	$ 260,096,000
Add: dividends declared-common shareholders	61,457,000	61,199,000	183,333,000	184,836,000
Numerator for basic and diluted earnings per common share	$ (73,468,000)	$ 240,138,000	$ 935,748,000	$ 444,931,000
Denominator for basic earnings per weighted-average common shares	39,161,000	39,483,000	39,409,000	39,711,000
Effect of dilutive securities: Options	36,000	74,000	44,000	79,000
Denominator for diluted earnings per adjusted weighted-average common shares	39,197,000	39,557,000	39,452,000	39,790,000
Per common share net income (loss)
Basic	$ (1.88)	$ 6.08	$ 23.74	$ 11.20
Diluted	$ (1.88)	$ 6.07	$ 23.72	$ 11.18
Basic weighted-average common shares outstanding	39,161,000	39,483,000	39,409,000	39,711,000
Basic weighted-average common shares outstanding and unvested common shares expected to vest	39,161,000	39,971,000	39,945,000	40,221,000

Commitments And Contingencies_2

Commitments And Contingencies (Narrative) (Details) - Equity Index Put Option [Member] - Standard & Poor's 500 [Member]	9 Months Ended
	Sep. 30, 2021USD ($)Item$ / Item
Derivative [Line Items]
Number of equity index put option contracts | Item	1
Probability of falling below strike price, percentage	0.10%
Index | $ / Item	4,307.54
Theoretical [Member]
Derivative [Line Items]
Maximum discount factor	3.00%
Maximum payout occurs based on index value	$ 151,200,000
If Contracts Expire [Member]
Derivative [Line Items]
Settlement amount	$ 0

Commitments And Contingencies_3

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 138,869	$ 140,773
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 34,163	$ 35,128

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ (165,904)	$ 122,324	$ (367,279)	$ 426,931
Total, Tax Effect	12,459	(7,863)	36,113	(43,485)
Total, Net of Tax	(153,445)	114,461	(331,166)	383,446
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(107,980)	68,264	(343,137)	373,990
Tax Effect	7,959	(4,784)	38,672	(38,155)
Net of Tax	(100,021)	63,480	(304,465)	335,835
Reclassification, Before Tax	(809)	(12,678)	(1,233)	18,650
Reclassification, Tax Effect	(579)	1,225	(2,231)	(5,961)
Reclassification, Net of Tax	(1,388)	(11,453)	(3,464)	12,689
Total, Net of Tax	(101,409)	52,027	(307,929)	348,524
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(59,094)	64,453	(30,060)	28,555
Tax Effect	5,495	(3,825)	1,174	1,835
Net of Tax	(53,599)	60,628	(28,886)	30,390
Total, Net of Tax	(53,599)	60,628	(28,886)	30,390
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification, Before Tax	1,979	2,285	7,151	5,736
Reclassification, Tax Effect	(416)	(479)	(1,502)	(1,204)
Reclassification, Net of Tax	1,563	1,806	5,649	4,532
Total, Net of Tax	$ 1,563	$ 1,806	$ 5,649	$ 4,532

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ 14,251	$ (29,451)	$ (97,181)	$ (15,404)
NET INCOME (LOSS)	(73,468)	243,057	948,376	450,549
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)	(809)	(12,678)	(1,233)	18,650
Income tax expense (benefit)	(579)	1,225	(2,231)	(5,961)
NET INCOME (LOSS)	(1,388)	(11,453)	(3,464)	12,689
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	1,979	2,285	7,151	5,736
Income tax expense (benefit)	(416)	(479)	(1,502)	(1,204)
NET INCOME (LOSS)	$ 1,563	$ 1,806	$ 5,649	$ 4,532

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 9,726,176				$ 9,726,176
Current period change	$ (153,445)			$ 114,461			(331,166)	$ 383,446
Balance	9,978,635			9,591,292			9,978,635	9,591,292
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	517,639		724,159	600,922		$ 304,425	724,159	304,425
Current period change	(101,409)			52,027			(307,929)	348,524
Balance	416,230	$ 517,639		652,949	$ 600,922		416,230	652,949
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(90,677)		(115,390)	(231,955)		(201,717)	(115,390)	(201,717)
Current period change	(53,599)			60,628			(28,886)	30,390
Balance	(144,276)	(90,677)		(171,327)	(231,955)		(144,276)	(171,327)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(69,784)		(73,870)	(71,830)		(74,556)	(73,870)	(74,556)
Current period change	1,563			1,806			5,649	4,532
Balance	(68,221)	(69,784)		(70,024)	(71,830)		(68,221)	(70,024)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	357,178	235,079	534,899	297,137	(269,751)	28,152	534,899	28,152
Current period change	(153,445)	122,099	(299,820)	114,461	566,888	(297,903)
Balance	$ 203,733	$ 357,178	$ 235,079	$ 411,598	$ 297,137	$ (269,751)	$ 203,733	$ 411,598

Credit Facilities (Narrative) (

Credit Facilities (Narrative) (Details)	May 26, 2016USD ($)	Jun. 22, 2012USD ($)	Sep. 30, 2021GBP (£)ItemRate	Sep. 30, 2021GBP (£)ItemRate	Dec. 31, 2020GBP (£)	Dec. 31, 2019	Sep. 30, 2021USD ($)ItemRate	May 05, 2021USD ($)	Feb. 23, 2021USD ($)	Dec. 31, 2020USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, commitment							$ 1,530,000,000
Uncommitted amount available							$ 140,000,000
Maximum percentage of admitted assets allowed for borrowing base			10.00%	10.00%			10.00%
Borrowings from FHLB							$ 310,000,000			$ 310,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	5 years	4 years
Line of credit facility, commitment	$ 800,000,000	$ 800,000,000					$ 600,000,000			800,000,000
Line of credit facility, number of tranches | Item			2	2			2
Line of credit facility, required debt-to-capital ratio | Rate			35.00%	35.00%			35.00%
Line of credit facility, required minimum net worth							$ 5,371,000,000
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants				25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants				25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants							6,651,800,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date					Dec. 31, 2021
Line of credit facility, commitment										200,000,000
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021	Dec. 31, 2021
Line of credit facility, commitment							600,000,000			600,000,000
Wells Fargo Bank Bilateral Loc Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration date				Dec. 31, 2021
Line of credit facility, commitment							500,000,000	$ 500,000,000	$ 50,000,000
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment							230,000,000			$ 200,000,000
Uncommitted amount available							$ 140,000,000
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment | £			£ 52,175,000	£ 52,175,000	£ 52,175,000
Line of credit facility, required debt-to-capital ratio | Rate			35.00%	35.00%			35.00%
Line of credit facility, required minimum net worth							$ 6,393,000,000
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							6,788,700,000
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Admitted assets for FHLB							18,874,000,000
Maximum amount available under FHLB							1,887,400,000
Borrowings from FHLB							$ 400,000,000
FHLB advance interest rate			0.35%	0.35%			0.35%
Amount of borrowed funds required to be used to acquire additional membership stock, percentage				4.50%
Federal Home Loan Bank Of New York [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
FHLB advance maturity				Nov. 30, 2021
Federal Home Loan Bank Of New York [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
FHLB advance maturity				Dec. 31, 2021
Bayerische Landesbank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment							$ 200,000,000

Credit Facilities (Summary Of C

Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Line of Credit Facility [Line Items]
Credit facility interest and fees incurred	$ 281	$ 132	$ 1,002	$ 587
Active Credit Facilities [Member]
Line of Credit Facility [Line Items]
Credit facility interest and fees incurred		105	175	560
Federal Home Loan Bank Of New York [Member]
Line of Credit Facility [Line Items]
Credit facility interest and fees incurred	$ 281	$ 27	$ 827	$ 27

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And Borrowings) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021GBP (£)	Dec. 31, 2020GBP (£)	Sep. 30, 2021USD ($)	May 05, 2021USD ($)	Feb. 23, 2021USD ($)	Dec. 31, 2020USD ($)	May 26, 2016USD ($)	Jun. 22, 2012USD ($)
Line of Credit Facility [Line Items]
Commitment			$ 1,530,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000			$ 800,000,000	$ 800,000,000	$ 800,000,000
In Use			402,284,000			753,932,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment						200,000,000
In Use						164,242,000
Date of Expiry		Dec. 31, 2021
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000			600,000,000
In Use			402,284,000			589,690,000
Date of Expiry	Dec. 31, 2021	Dec. 31, 2021
Wells Fargo Bank Bilateral Loc Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			500,000,000	$ 500,000,000	$ 50,000,000
In Use			404,157,000
Date of Expiry	Dec. 31, 2021
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			230,000,000			200,000,000
In Use			200,704,000			185,483,000
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			230,000,000			200,000,000
In Use			1,264,000			4,425,000
Date of Expiry	Nov. 24, 2021	Feb. 28, 2021
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			429,000			3,672,000
Date of Expiry	Dec. 16, 2021	Nov. 24, 2021
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			139,887,000			448,000
Date of Expiry	Dec. 31, 2021	Dec. 16, 2021
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			4,425,000			115,000
Date of Expiry	Feb. 28, 2022	Dec. 20, 2021
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			838,000			136,383,000
Date of Expiry	Mar. 1, 2022	Dec. 31, 2021
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			148,000			39,619,000
Date of Expiry	Dec. 20, 2022	Dec. 30, 2024
Citibank Bilateral Letter Of Credit Agreement Seven [Member]
Line of Credit Facility [Line Items]
In Use			28,498,000			$ 821,000
Date of Expiry	Dec. 31, 2022	Aug. 15, 2022
Citibank Bilateral Letter Of Credit Agreement Eight [Member]
Line of Credit Facility [Line Items]
In Use			999,000
Date of Expiry	Aug. 15, 2023
Citibank Bilateral Letter Of Credit Agreement Nine [Member]
Line of Credit Facility [Line Items]
In Use			1,252,000
Date of Expiry	Sep. 23, 2023
Citibank Bilateral Letter Of Credit Agreement Ten [Member]
Line of Credit Facility [Line Items]
In Use			22,964,000
Date of Expiry	Sep. 30, 2025
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 52,175,000	£ 52,175,000
In Use | £	52,175,000	52,175,000
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £	52,175,000	52,175,000
In Use | £	£ 52,175,000	£ 52,175,000
Date of Expiry	Dec. 31, 2024	Dec. 31, 2023
Bayerische Landesbank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000
In Use
Bayerische Landesbank Bilateral Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000
In Use

Collateralized Reinsurance An_3

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) - USD ($) $ in Millions	Apr. 01, 2018	Sep. 30, 2021	Dec. 31, 2020
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts		$ 1,526.1
Preferred shares
Reinsurance recoverable		217.5	254.9
Deferred gain liabliity		$ 34.4	38.8
Mt Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group		100.00%
Assumed net risk exposures		$ 847.3	806.6
Net risk exposure investments		$ 61.6	$ 67.6
Retrocede amount	$ 269.2
Cash transferred	252
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

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 114,694	$ 86,712	$ 269,987	$ 245,422
Ceded earned premiums	100,133	71,396	249,662	233,089
Ceded losses and LAE	169,998	87,917	281,893	173,968
Assumed written premiums	4,273	8,894	9,490	14,448
Assumed earned premiums	4,273	8,894	9,490	14,448
Assumed losses and LAE

Collateralized Reinsurance An_5

Collateralized Reinsurance And Trust Agreements (Summary of Collateralized Reinsurance Agreements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effects of Reinsurance [Line Items]
Limit	$ 114,694	$ 86,712	$ 269,987	$ 245,422
Kilimanjaro Re Limited [Member] | Series 2017-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 13, 2017
Expiration Date			Apr. 13, 2022
Limit			$ 50,000
Kilimanjaro Re Limited [Member] | Series 2017-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 13, 2017
Expiration Date			Apr. 13, 2022
Limit			$ 75,000
Kilimanjaro Re Limited [Member] | Series 2017-1 Class C-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 13, 2017
Expiration Date			Apr. 13, 2022
Limit			$ 175,000
Kilimanjaro Re Limited [Member] | Series 2018-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 30, 2018
Expiration Date			May 6, 2022
Limit			$ 62,500
Kilimanjaro Re Limited [Member] | Series 2018-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 30, 2018
Expiration Date			May 6, 2022
Limit			$ 200,000
Kilimanjaro Re Limited [Member] | Series 2018-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 30, 2018
Expiration Date			May 5, 2023
Limit			$ 62,500
Kilimanjaro Re Limited [Member] | Series 2018-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 30, 2018
Expiration Date			May 5, 2023
Limit			$ 200,000
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Dec. 12, 2019
Expiration Date			Dec. 19, 2023
Limit			$ 150,000
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Dec. 12, 2019
Expiration Date			Dec. 19, 2023
Limit			$ 275,000
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Dec. 12, 2019
Expiration Date			Dec. 19, 2024
Limit			$ 150,000
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Dec. 12, 2019
Expiration Date			Dec. 19, 2024
Limit			$ 275,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 21, 2025
Limit			$ 150,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 21, 2025
Limit			$ 85,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class C-1 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 21, 2025
Limit			$ 85,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 20, 2026
Limit			$ 150,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 20, 2026
Limit			$ 90,000
Kilimanjaro Re Limited [Member] | Series 2021-1 Class C-2 [Member]
Effects of Reinsurance [Line Items]
Effective Date			Apr. 8, 2021
Expiration Date			Apr. 20, 2026
Limit			$ 90,000

Collateralized Reinsurance An_6

Collateralized Reinsurance And Trust Agreements (Schedule of Proceeds from Issuance of Notes Held in Reinsurance Trusts) (Details) - Kilimanjaro Re Limited [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)
Series 2017-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 13, 2017
Maturity Date	Apr. 13, 2022
Amount	$ 50,000
Series 2017-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 13, 2017
Maturity Date	Apr. 13, 2022
Amount	$ 75,000
Series 2017-1 Class C-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 13, 2017
Maturity Date	Apr. 13, 2022
Amount	$ 175,000
Series 2018-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 6, 2022
Amount	$ 62,500
Series 2018-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 6, 2022
Amount	$ 200,000
Series 2018-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 5, 2023
Amount	$ 62,500
Series 2018-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 5, 2023
Amount	$ 200,000
Series 2019-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2023
Amount	$ 150,000
Series 2019-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2023
Amount	$ 275,000
Series 2019-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2024
Amount	$ 150,000
Series 2019-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2024
Amount	$ 275,000
Series 2021-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 150,000
Series 2021-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 85,000
Series 2021-1 Class C-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 85,000
Series 2021-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 90,000
Series 2021-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 150,000
Series 2021-1 Class C-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 8, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 90,000

Senior Notes (Narrative) (Detai

Senior Notes (Narrative) (Details) - Senior Notes [Member] - USD ($)	Oct. 04, 2021	Sep. 30, 2021	Dec. 31, 2020
4.868% Senior Notes due 6/1/2044 [Member]
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	Jun. 1, 2044
3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued		Oct. 7, 2020
Debt instrument face amount		$ 1,000,000,000
Debt instrument, term		30 years
Debt instrument, stated interest rate		3.50%
Debt instrument, maturity date		Oct. 15, 2050	Oct. 15, 2050
3.125% Senior notes due 10/15/2052 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Date issued	Oct. 4, 2021
Debt instrument face amount	$ 1,000,000,000
Debt instrument, term	31 years
Debt instrument, stated interest rate	3.125%
Debt instrument, maturity date	Oct. 15, 2052

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - Senior Notes [Member] - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044	Jun. 1, 2044
Original Principal Amount	$ 400,000,000
Consolidated Balance Sheet Amount	397,284,000	$ 397,194,000
Market Value	$ 506,828,000	$ 528,000,000
Debt instrument, stated interest rate	4.868%
3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 7, 2020
Date due	Oct. 15, 2050	Oct. 15, 2050
Original Principal Amount	$ 1,000,000,000
Consolidated Balance Sheet Amount	979,915,000	$ 979,524,000
Market Value	$ 1,065,400,000	$ 1,138,100,000
Debt instrument, stated interest rate	3.50%

Senior Notes (Schedule Of Inter

Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 4,868	$ 4,868	$ 14,604	$ 14,604
Debt instrument, stated interest rate	4.868%		4.868%
3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 8,805		$ 26,415
Debt instrument, stated interest rate	3.50%		3.50%

Long Term Subordinated Notes (N

Long Term Subordinated Notes (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)Item	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Nov. 14, 2021
Debt Instrument [Line Items]
Redemption date			May 1, 2047
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption			100.00%
Outstanding debt reduction			$ 161,400,000
Gain on repurchase and retirement of debt					$ 13,200,000
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%		6.60%
Interest payment commencement date			Nov. 15, 2007
Basis spread on variable rate			2.385%
Right to defer interest, number of occasions | Item			1
Debt instrument, maturity date			May 1, 2067		May 1, 2067
Outstanding debt reduction	$ 0	$ 0	$ 0	$ 13,200,000
Gain on repurchase and retirement of debt		$ 0		$ 2,500,000
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate						2.51%
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
Right to defer interest on one or more occasions for up to number of consecutive years			10 years
Senior Notes [Member] | 5.4% Senior notes due 10/15/2014 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.40%		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%		4.868%
Debt instrument, maturity date			Jun. 1, 2044		Jun. 1, 2044
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.50%		3.50%
Debt instrument, maturity date			Oct. 15, 2050		Oct. 15, 2050

Long Term Subordinated Notes (S

Long Term Subordinated Notes (Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 223,749,000	$ 223,674,000
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date Issued	Jun. 5, 2014
Original Principal Amount	$ 400,000,000
Maturity Date	Jun. 1, 2044	Jun. 1, 2044
Market Value	$ 506,828,000	$ 528,000,000
Senior Notes [Member] | 3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date Issued	Oct. 7, 2020
Original Principal Amount	$ 1,000,000,000
Maturity Date	Oct. 15, 2050	Oct. 15, 2050
Market Value	$ 1,065,400,000	$ 1,138,100,000
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Date Issued	Apr. 26, 2007
Original Principal Amount	$ 400,000,000
Maturity Date	May 1, 2067	May 1, 2067
Consolidated balance sheet amount	$ 223,749,000	$ 223,674,000
Market Value	$ 216,043,000	$ 206,447,000
Scheduled [Member] | Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037

Long Term Subordinated Notes _2

Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Interest expense incurred	$ 1,456,000	$ 1,587,000	$ 4,378,000	$ 6,126,000

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Percentage threshold of Company revenue not exceeded by any other country	5.00%

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Premiums earned	$ 2,656,403	$ 2,205,811	$ 7,602,640	$ 6,285,030
Incurred losses and LAE	2,274,301	1,736,210	5,571,861	4,574,066
Commission and brokerage	564,335	445,332	1,611,095	1,360,170
Other underwriting expenses	141,150	138,875	424,225	385,865
Underwriting gain (loss)	(323,383)	(114,606)	(4,541)	(35,071)
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	2,488,344	2,086,961	6,695,594	5,403,080
Net written premiums	2,292,957	1,936,851	6,265,825	4,974,034
Premiums earned	1,976,454	1,669,257	5,674,707	4,656,733
Incurred losses and LAE	1,766,197	1,335,048	4,206,243	3,361,367
Commission and brokerage	471,079	373,251	1,353,062	1,130,946
Other underwriting expenses	45,347	51,333	144,408	135,170
Underwriting gain (loss)	(306,170)	(90,375)	(29,006)	29,250
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premium	1,009,264	704,643	2,923,587	2,328,733
Net written premiums	732,832	511,829	2,123,311	1,693,603
Premiums earned	679,949	536,554	1,927,933	1,628,297
Incurred losses and LAE	508,103	401,162	1,365,619	1,212,699
Commission and brokerage	93,256	72,081	258,033	229,224
Other underwriting expenses	95,802	87,542	279,817	250,695
Underwriting gain (loss)	$ (17,213)	$ (24,231)	$ 24,465	$ (64,321)

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	$ (323,383)	$ (114,606)	$ (4,541)	$ (35,071)
Net investment income	292,759	234,233	960,267	420,116
Net realized capital gains (losses)	(4,222)	110,203	138,789	84,263
Corporate expenses	(17,817)	(10,618)	(46,363)	(29,184)
Interest, fee and bond issue cost amortization expense	(15,539)	(6,641)	(46,785)	(21,477)
Other income (expense)	(19,517)	59,937	44,190	47,306
INCOME (LOSS) BEFORE TAXES	$ (87,719)	$ 272,508	$ 1,045,557	$ 465,953

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
United Kingdom [Member]
Segment Reporting Information [Line Items]
Gross written premium	$ 281,645	$ 314,502	$ 897,107	$ 857,310

Share-Based Compensation Plans

Share-Based Compensation Plans (Narrative) (Details) - $ / shares	Sep. 09, 2021	May 12, 2021	Feb. 24, 2021	Feb. 23, 2021	Sep. 30, 2021	Sep. 30, 2021
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period	2,090	2,275	10,656	194,610	2,090	209,631
Weighted-average grant-date fair value of options granted	$ 263.63	$ 264.845	$ 244.445	$ 242.24
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period				22,205
Weighted-average grant-date fair value of options granted				$ 242.24