Everest Re (EG) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Entity Registrant Name	EVEREST RE GROUP LTD
Entity Central Index Key	1,095,073
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		40,855,442

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2018, $14,435,792; 2017, $14,689,598)	$ 14,242,890	$ 14,756,834
Fixed maturities - available for sale, at fair value	3,192
Equity securities - available for sale, at market value (cost: 2018, $0; 2017, $130,287)		129,530
Equity securities - available for sale, at fair value	1,220,770	963,572
Short-term investments	293,191	509,682
Other invested assets (cost: 2018, $1,826,148; 2017, $1,628,753)	1,826,148	1,631,850
Cash	619,493	635,067
Total investments and cash	18,205,684	18,626,535
Accrued investment income	98,585	97,704
Premiums receivable	1,961,388	1,844,881
Reinsurance receivables	1,779,581	1,348,226
Funds held by reinsureds	368,680	292,927
Deferred acquisition costs	418,167	411,587
Prepaid reinsurance premiums	368,665	288,211
Income taxes	280,696	299,438
Other assets	404,439	382,283
TOTAL ASSETS	23,885,885	23,591,792
LIABILITIES:
Reserve for losses and loss adjustment expenses	12,043,334	11,884,321
Future policy benefit reserve	48,845	51,014
Unearned premium reserve	2,141,399	2,000,556
Funds held under reinsurance treaties	17,087	18,030
Other net payable to reinsurers	312,474	218,017
4.868% Senior notes due 6/1/2044	396,894	396,834
6.6% Long term notes due 5/1/2067	236,610	236,561
Accrued interest on debt and borrowings	3,010	2,727
Equity index put option liability	9,218	12,477
Unsettled securities payable	54,563	38,743
Other liabilities	381,102	363,280
Total liabilities	15,644,536	15,222,560
Commitments and contingencies (Note 8)
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; (2018) 69,181 and (2017) 69,044 outstanding before treasury shares	692	691
Additional paid-in capital	2,172,701	2,165,768
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of ($15,938) at 2018 and $9,356 at 2017	(445,338)	(160,891)
Treasury shares, at cost; 28,321 shares (2018) and 28,208 shares (2017)	(3,347,548)	(3,322,244)
Retained earnings	9,860,842	9,685,908
Total shareholders' equity	8,241,349	8,369,232
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 23,885,885	$ 23,591,792

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fixed maturities - available for sale, at market value, amortized cost	$ 14,435,792	$ 14,689,598
Equity securities - available for sale, at market value, cost	0	130,287
Other invested assets, at cost	$ 1,826,148	$ 1,628,753
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	200,000,000	200,000,000
Common shares, outstanding	69,181,000	69,044,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit)	$ (15,938)	$ 9,356
Treasury shares	28,321,000	28,208,000
6.6 % Long Term Subordinated Notes [Member]
Debt instrument, stated interest rate	6.60%	6.60%
Debt instrument, maturity date	May 1, 2067
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt instrument, stated interest rate	4.868%	4.868%
Debt instrument, maturity date	Jun. 1, 2044

Consolidated Statements Of Oper

Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES:
Premiums earned	$ 1,729,818	$ 1,369,681	$ 3,349,245	$ 2,681,778
Net investment income	141,322	134,508	279,616	256,797
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	(888)	(2,475)	(958)	(3,703)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	16,664	27,743	(8,167)	81,699
Total net realized capital gains (losses)	15,776	25,268	(9,125)	77,996
Net derivative gain (loss)	2,987	766	3,260	3,396
Other income (expense)	3,036	388	15,100	(4,578)
Total revenues	1,892,939	1,530,611	3,638,096	3,015,389
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	1,341,314	861,275	2,398,491	1,632,063
Commission, brokerage, taxes and fees	383,402	299,956	741,041	582,225
Other underwriting expenses	93,099	78,869	189,383	154,756
Corporate expenses	6,633	6,919	15,629	15,376
Interest, fees and bond issue cost amortization expense	7,728	8,059	15,146	17,023
Total claims and expenses	1,832,176	1,255,078	3,359,690	2,401,443
INCOME (LOSS) BEFORE TAXES	60,763	275,533	278,406	613,946
Income tax expense (benefit)	(9,132)	29,859	(1,807)	76,629
NET INCOME (LOSS)	69,895	245,674	280,213	537,317
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	(41,776)	4,868	(232,400)	24,416
Reclassification adjustment for realized losses (gains) included in net income (loss)	249	(8,993)	(8,523)	(11,192)
Total URA(D) on securities arising during the period	(41,527)	(4,125)	(240,923)	13,224
Foreign currency translation adjustments	(63,652)	35,667	(45,953)	47,560
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	1,815	2,004	3,630	4,008
Total benefit plan net gain (loss) for the period	1,815	2,004	3,630	4,008
Total other comprehensive income (loss), net of tax	(103,364)	33,546	(283,246)	64,792
COMPREHENSIVE INCOME (LOSS)	$ (33,469)	$ 279,220	$ (3,033)	$ 602,109
EARNINGS PER COMMON SHARE:
Basic	$ 1.71	$ 5.98	$ 6.85	$ 13.10
Diluted	1.70	5.95	6.81	13.02
Dividends declared	$ 1.3	$ 1.25	$ 2.6	$ 2.5

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Shares At Cost [Member]	Total
Balance, beginning of period, shares at Dec. 31, 2016	40,898,864
Issued during the period, shares	166,348
Balance, beginning of period at Dec. 31, 2016	$ 689	$ 2,140,783	$ (216,764)	$ 9,422,932	$ (3,272,244)
Issued during the period, net	$ 2
Share-based compensation plans		9,876
Net increase (decrease) during the period			64,792			$ 64,792
Net income (loss)				537,317		537,317
Dividends declarrd ($1.30 per share in second quarter 2018 $2.60 year-to-date per share in 2018 and $1.25 per share in second quarter of 2017 and $2.50 year-to-date per share in 2017)				(102,585)		(102,585)
Purchase of treasury shares
Balance, end of period, shares at Jun. 30, 2017	41,065,212
Balance, end of period at Jun. 30, 2017	$ 691	2,150,659	(151,972)	9,857,664	(3,272,244)	$ 8,584,798
Balance, beginning of period, shares at Dec. 31, 2016	40,898,864
Balance, beginning of period at Dec. 31, 2016	$ 689	2,140,783	(216,764)	9,422,932	(3,272,244)
Balance, end of period, shares at Dec. 31, 2017	40,835,272					69,044,000
Balance, end of period at Dec. 31, 2017	$ 691	2,165,768	(160,891)	9,685,908	(3,322,244)	$ 8,369,232
Balance, beginning of period, shares at Mar. 31, 2017	41,057,991
Issued during the period, shares	7,221
Balance, beginning of period at Mar. 31, 2017	$ 691	2,141,653	(185,518)	9,663,294	(3,272,244)
Share-based compensation plans		9,006
Net increase (decrease) during the period			33,546			33,546
Net income (loss)				245,674		245,674
Dividends declarrd ($1.30 per share in second quarter 2018 $2.60 year-to-date per share in 2018 and $1.25 per share in second quarter of 2017 and $2.50 year-to-date per share in 2017)				(51,304)		(51,304)
Purchase of treasury shares
Balance, end of period, shares at Jun. 30, 2017	41,065,212
Balance, end of period at Jun. 30, 2017	$ 691	2,150,659	(151,972)	9,857,664	(3,272,244)	$ 8,584,798
Balance, beginning of period, shares at Dec. 31, 2017	40,835,272					69,044,000
Issued during the period, shares	137,644
Treasury shares acquired, shares	(112,747)
Balance, beginning of period at Dec. 31, 2017	$ 691	2,165,768	(160,891)	9,685,908	(3,322,244)	$ 8,369,232
Issued during the period, net	$ 1
Share-based compensation plans		6,933
Net increase (decrease) during the period			(283,246)			(283,246)
Net income (loss)				280,213		280,213
Dividends declarrd ($1.30 per share in second quarter 2018 $2.60 year-to-date per share in 2018 and $1.25 per share in second quarter of 2017 and $2.50 year-to-date per share in 2017)				(106,480)		$ (106,480)
Purchase of treasury shares					(25,304)
Balance, end of period, shares at Jun. 30, 2018	40,860,169					69,181,000
Balance, end of period at Jun. 30, 2018	$ 692	2,172,701	(445,338)	9,860,842	(3,347,548)	$ 8,241,349
Balance, beginning of period, shares at Mar. 31, 2018	40,978,634
Issued during the period, shares	(5,718)
Treasury shares acquired, shares	(112,747)
Balance, beginning of period at Mar. 31, 2018	$ 692	2,163,519	(341,974)	9,844,187	(3,322,244)
Share-based compensation plans		9,182
Net increase (decrease) during the period			(103,364)			(103,364)
Net income (loss)				69,895		69,895
Dividends declarrd ($1.30 per share in second quarter 2018 $2.60 year-to-date per share in 2018 and $1.25 per share in second quarter of 2017 and $2.50 year-to-date per share in 2017)				(53,240)		$ (53,240)
Purchase of treasury shares					(25,304)
Balance, end of period, shares at Jun. 30, 2018	40,860,169					69,181,000
Balance, end of period at Jun. 30, 2018	$ 692	$ 2,172,701	(445,338)	9,860,842	$ (3,347,548)	$ 8,241,349
Cumulative change due to adoption of Accounting Standards Update 2016-01			$ 1,201	$ (1,201)		$ (1,201)

Consolidated Statements Of Cha6

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 1.3	$ 1.25	$ 2.6	$ 2.5

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 280,213	$ 537,317
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(126,355)	(337,069)
Decrease (increase) in funds held by reinsureds, net	(77,794)	(7,980)
Decrease (increase) in reinsurance receivables	(467,011)	8,270
Decrease (increase) in income taxes	43,516	18,362
Decrease (increase) in prepaid reinsurance premiums	(86,044)	(87,091)
Increase (decrease) in reserve for losses and loss adjustment expenses	223,202	97,493
Increase (decrease) in future policy benefit reserve	(2,169)	(836)
Increase (decrease) in unearned premiums	151,528	161,009
Increase (decrease) in other net payable to reinsurers	101,970	65,929
Increase (decrease) in losses in course of payment	162,073	288,557
Change in equity adjustments in limited partnerships	(45,898)	(31,032)
Distribution of limited partnership income	42,269	22,992
Change in other assets and liabilities, net	(111,220)	(61,763)
Non-cash compensation expense	17,566	15,725
Amortization of bond premium (accrual of bond discount)	17,677	22,475
Net realized capital (gains) losses	9,125	(77,996)
Net cash provided by (used in) operating activities	132,648	634,362
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	1,099,762	1,145,162
Proceeds from fixed maturities sold - available for sale, at market value	1,225,373	991,209
Proceeds from fixed maturities sold - available for sale, at fair value	1,065
Proceeds from equity securities sold - available for sale, at market value		18,802
Proceeds from equity securities sold - available for sale, at fair value	576,382	258,226
Distributions from other invested assets	2,978,865	2,476,399
Cost of fixed maturities acquired - available for sale, at market value	(2,163,331)	(2,880,188)
Cost of fixed maturities acquired - available for sale, at fair value	(4,381)
Cost of equity securities acquired - available for sale, at market value		(2,610)
Cost of equity securities acquired - available for sale, at fair value	(722,797)	(258,543)
Cost of other invested assets acquired	(3,168,655)	(2,431,281)
Net change in short-term investments	213,242	105,566
Net change in unsettled securities transactions	(33,351)	47,800
Net cash provided by (used in) investing activities	2,174	(529,458)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period for share-based compensation, net of expense	(9,431)	(5,847)
Purchase of treasury shares	(25,304)
Dividends paid to shareholders	(106,480)	(102,585)
Cost of shares withheld for taxes on settlements of share-based compensation awards	(14,859)	(12,407)
Net cash provided by (used in) financing activities	(156,074)	(120,839)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	5,678	3,218
Net increase (decrease) in cash	(15,574)	(12,717)
Cash, beginning of period	635,067	481,922
Cash, end of period	619,493	469,205
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	(44,151)	57,772
Interest paid	$ 14,754	$ 17,818

General

General	6 Months Ended
	Jun. 30, 2018
General [Abstract]
General	1. GENERAL Everest Re Group, Ltd. ("Group"), a Bermuda company, through its subsidiaries, principally provides reinsurance and insurance in the U.S., Bermuda and international markets. As used in this document, "Company" means Group and its subsidiaries. During the fourth quarter of 2017, the Company established a new Irish insurance subsidiary, Everest Insurance Ireland, designated activity company ("Ireland Insurance"), which will write insurance business mainly in the European markets. During the third quarter of 2016, the Company established domestic subsidiaries, Everest Premier Insurance Company ("Everest Premier") and Everest Denali Insurance Company ("Everest Denali"), which will be used in the continued expansion of the Insurance operations. Effective July 1, 2016, the Company established a new Irish holding company, Everest Dublin Insurance Holdings Limited (Ireland) ("Everest Dublin Holdings").

Basis Of Presentation

Basis Of Presentation	6 Months Ended
	Jun. 30, 2018
Basis Of Presentation [Abstract]
Basis Of Presentation	2. BASIS OF PRESENTATION The unaudited consolidated financial statements of the Company for the three and six months ended June 30, 2018 and 2017 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, 2017 consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The results for the three and six months ended June 30, 2018 and 2017 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, 2017, 2016 and 2015 included in the Company's most recent Form 10-K filing. The Company consolidates the results of operations and financial position of all voting interest entities ("VOE") in which the Company has a controlling financial interest and all variable interest entities ("VIE") in which the Company is considered to be the primary beneficiary. The consolidation assessment, including the determination as to whether an entity qualifies as a VIE or VOE, depends on the facts and circumstances surrounding each entity. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Ultimate actual results could differ, possibly materially, from those estimates. All significant intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior year's amounts to conform to the 2018 presentation. Application of Recently Issued Accounting Standard Changes. Accounting for Deferred Taxes in Accumulated Other Comprehensive Income (AOCI). 35 21 1,250 Accounting for Impact on Income Taxes due to Tax Reform. Amortization of Bond Premium. Presentation and Disclosure of Net Periodic Benefit Costs. Disclosure of Restricted Cash. Intra-Entity Asset Transfers. Valuation of Financial Instruments. Accounting for Share-Based Compensation. Leases. Recognition and Measurement of Financial Instruments. 1,201 Disclosures about Short-Duration Contracts. Revenue Recognition. Any issued guidance and pronouncements, other than those directly referenced above, are deemed by the Company to be either not applicable or immaterial to its financial statements.

Investments

Investments	6 Months Ended
	Jun. 30, 2018
Investments [Abstract]
Investments	3. INVESTMENTS The amortized cost, market value and gross unrealized appreciation and depreciation of available for sale, fixed maturity, equity security investments, carried at market value and other-than-temporary impairments ("OTTI") in accumulated other comprehensive income ("AOCI") are as follows for the periods indicated: At June 30, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,158,844 $ 10,522 $ (24,870 ) $ 1,144,496 $ - Obligations of U.S. states and political subdivisions 525,087 14,731 (1,934 ) 537,884 420 Corporate securities 5,783,255 50,084 (122,678 ) 5,710,661 2,740 Asset-backed securities 491,885 127 (6,056 ) 485,956 - Mortgage-backed securities Commercial 229,450 - (6,475 ) 222,975 - Agency residential 2,144,163 7,389 (66,926 ) 2,084,626 - Non-agency residential 22 38 - 60 - Foreign government securities 1,256,344 33,478 (52,825 ) 1,236,997 136 Foreign corporate securities 2,846,742 59,779 (87,286 ) 2,819,235 588 Total fixed maturity securities $ 14,435,792 $ 176,148 $ (369,050 ) $ 14,242,890 $ 3,884 Equity securities $ - $ - $ - $ - $ - At December 31, 2017 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,540,952 $ 9,816 $ (14,076 ) $ 1,536,692 $ - Obligations of U.S. states and political subdivisions 563,790 22,123 (444 ) 585,469 - Corporate securities 5,658,456 81,724 (41,175 ) 5,699,005 2,488 Asset-backed securities 532,473 869 (1,982 ) 531,360 - Mortgage-backed securities Commercial 235,794 616 (2,369 ) 234,041 - Agency residential 2,236,361 10,379 (35,838 ) 2,210,902 - Non-agency residential 497 41 (44 ) 494 - Foreign government securities 1,305,070 43,804 (34,847 ) 1,314,027 178 Foreign corporate securities 2,616,205 77,045 (48,406 ) 2,644,844 950 Total fixed maturity securities $ 14,689,598 $ 246,417 $ (179,181 ) $ 14,756,834 $ 3,616 Equity securities $ 130,287 $ 2,615 $ (3,372 ) $ 129,530 $ - (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date Effective January 1, 2018, the Company adopted ASU 2016-01, which requires equity investments in unconsolidated entities to be measured at fair value, with any change in value being recorded within net realized capital gains/(losses) as part of the consolidated statements of operations and comprehensive income (loss). Previously, changes in the market value had been recorded within AOCI as part of the consolidated balance sheets. Therefore, effective January 1, 2018, equity security investments no longer have an impact upon the AOCI balance. The amortized cost and market value of fixed maturity securities are shown in the following table by contractual maturity. Mortgage-backed securities are generally more likely to be prepaid than other fixed maturity securities. As the stated maturity of such securities may not be indicative of actual maturities, the totals for mortgage-backed and asset-backed securities are shown separately. At June 30, 2018 At December 31, 2017 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,157,956 $ 1,158,176 $ 1,041,885 $ 1,050,094 Due after one year through five years 7,151,383 7,045,835 7,545,731 7,554,248 Due after five years through ten years 2,435,785 2,395,193 2,214,473 2,231,456 Due after ten years 825,148 850,069 882,384 944,239 Asset-backed securities 491,885 485,956 532,473 531,360 Mortgage-backed securities: Commercial 229,450 222,975 235,794 234,041 Agency residential 2,144,163 2,084,626 2,236,361 2,210,902 Non-agency residential 22 60 497 494 Total fixed maturity securities $ 14,435,792 $ 14,242,890 $ 14,689,598 $ 14,756,834 The changes in net unrealized appreciation (depreciation) for the Company's investments are derived from the following sources for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ (40,921 ) $ (22,246 ) $ (260,406 ) $ (4,191 ) Fixed maturity securities, other-than-temporary impairment 456 (994 ) 267 (5,495 ) Equity securities - 1,193 - 7,192 Other invested assets - 821 - 1,265 Change in unrealized appreciation (depreciation), pre-tax (40,465 ) (21,226 ) (260,139 ) (1,229 ) Deferred tax benefit (expense) (1,007 ) 16,990 19,292 13,117 Deferred tax benefit (expense), other-than-temporary impairment (55 ) 111 (76 ) 1,336 Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ (41,527 ) $ (4,125 ) $ (240,923 ) $ 13,224 The Company frequently reviews all of its fixed maturity, available for sale securities for declines in market value and focuses its attention on securities whose fair value has fallen below 80 The Company's assessments are based on the issuers' current and expected future financial position, timeliness with respect to interest and/or principal payments, speed of repayments and any applicable credit enhancements or breakeven constant default rates on mortgage-backed and asset-backed securities, as well as relevant information provided by rating agencies, investment advisors and analysts. Upon the adoption of ASU 2016-01 as of January 1, 2018, all equity investments in unconsolidated entities are recorded at fair value. Prior to the adoption of ASU 2016-01, the Company classified certain equity securities as available for sale at market value. The majority of the Company's equity securities classified as available for sale at market value prior to January 1, 2018 were primarily comprised of mutual fund investments whose underlying securities consisted of fixed maturity securities. When a fund's value reflected an unrealized loss, the Company assessed whether the decline in value was temporary or other-than-temporary. In making its assessment, the Company considered the composition of its portfolios and their related markets, reports received from the portfolio managers and discussions with portfolio managers. If the Company determined that the declines were temporary and it had the ability and intent to continue to hold the investments, then the declines were recorded as unrealized losses in accumulated other comprehensive income (loss). If declines were deemed to be other-than-temporary, then the carrying value of the investment was written down to fair value and recorded in net realized capital gains (losses) in the Company's consolidated statements of operations and comprehensive income (loss). Retrospective adjustments are employed to recalculate the values of asset-backed securities. All of the Company's asset-backed and mortgage-backed securities have a pass-through structure. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used in the calculation of projected prepayments for pass-through security types. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at June 30, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 740,474 $ (14,053 ) $ 265,737 $ (10,817 ) $ 1,006,211 $ (24,870 ) Obligations of U.S. states and political subdivisions 45,254 (651 ) 36,939 (1,283 ) 82,193 (1,934 ) Corporate securities 3,629,848 (78,597 ) 807,050 (44,081 ) 4,436,898 (122,678 ) Asset-backed securities 315,541 (4,760 ) 92,906 (1,296 ) 408,447 (6,056 ) Mortgage-backed securities Commercial 156,895 (3,104 ) 66,079 (3,371 ) 222,974 (6,475 ) Agency residential 582,748 (11,118 ) 1,321,462 (55,808 ) 1,904,210 (66,926 ) Non-agency residential - - - - - - Foreign government securities 302,046 (8,212 ) 412,970 (44,613 ) 715,016 (52,825 ) Foreign corporate securities 1,332,956 (35,840 ) 584,790 (51,446 ) 1,917,746 (87,286 ) Total fixed maturity securities $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) Equity securities - - - - - - Total $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) Duration of Unrealized Loss at June 30, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 628,144 $ (2,598 ) $ 149,820 $ (13,881 ) $ 777,964 $ (16,479 ) Due in one year through five years 3,911,655 (78,589 ) 1,547,737 (106,257 ) 5,459,392 (184,846 ) Due in five years through ten years 1,270,453 (42,618 ) 367,885 (29,885 ) 1,638,338 (72,503 ) Due after ten years 240,326 (13,548 ) 42,044 (2,217 ) 282,370 (15,765 ) Asset-backed securities 315,541 (4,760 ) 92,906 (1,296 ) 408,447 (6,056 ) Mortgage-backed securities 739,643 (14,222 ) 1,387,541 (59,179 ) 2,127,184 (73,401 ) Total fixed maturity securities $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at June 30, 2018 were $ 10,693,695 369,050 7.1 1.1 156,335 135,754 212,715 207,796 The Company, given the size of its investment portfolio and capital position, does not have the intent to sell these securities; and it is more likely than not that the Company will not have to sell the security before recovery of its cost basis. In addition, all securities currently in an unrealized loss position are current with respect to principal and interest payments. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at December 31, 2017 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,077,051 $ (8,380 ) $ 224,189 $ (5,696 ) $ 1,301,240 $ (14,076 ) Obligations of U.S. states and political subdivisions 4,400 (27 ) 37,886 (417 ) 42,286 (444 ) Corporate securities 1,779,292 (24,942 ) 700,098 (16,233 ) 2,479,390 (41,175 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities Commercial 101,821 (572 ) 64,272 (1,797 ) 166,093 (2,369 ) Agency residential 610,941 (4,836 ) 1,343,547 (31,002 ) 1,954,488 (35,838 ) Non-agency residential - - 69 (44 ) 69 (44 ) Foreign government securities 327,790 (12,811 ) 331,432 (22,036 ) 659,222 (34,847 ) Foreign corporate securities 691,865 (19,381 ) 450,860 (29,025 ) 1,142,725 (48,406 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) Equity securities - - 113,506 (3,372 ) 113,506 (3,372 ) Total $ 4,894,476 $ (72,416 ) $ 3,338,639 $ (110,137 ) $ 8,233,115 $ (182,553 ) Duration of Unrealized Loss at December 31, 2017 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 247,927 $ (962 ) $ 206,113 $ (7,643 ) $ 454,040 $ (8,605 ) Due in one year through five years 2,930,977 (42,480 ) 1,200,414 (52,143 ) 4,131,391 (94,623 ) Due in five years through ten years 612,702 (20,154 ) 292,245 (12,680 ) 904,947 (32,834 ) Due after ten years 88,792 (1,945 ) 45,693 (941 ) 134,485 (2,886 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities 712,762 (5,408 ) 1,407,888 (32,843 ) 2,120,650 (38,251 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2017 were $ 8,233,115 182,553 8.9 1.1 72,416 68,107 106,765 103,739 no The components of net investment income are presented in the table below for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Fixed maturities $ 114,824 $ 108,122 $ 223,506 $ 211,367 Equity securities 6,672 8,366 13,499 17,111 Short-term investments and cash 2,092 835 3,824 1,465 Other invested assets Limited partnerships 21,996 20,060 45,377 31,058 Other 2,659 2,285 6,984 4,557 Gross investment income before adjustments 148,243 139,668 293,190 265,558 Funds held interest income (expense) 1,939 1,724 5,569 4,872 Future policy benefit reserve income (expense) (359 ) (416 ) (568 ) (735 ) Gross investment income 149,823 140,976 298,191 269,695 Investment expenses (8,501 ) (6,468 ) (18,575 ) (12,898 ) Net investment income $ 141,322 $ 134,508 $ 279,616 $ 256,797 The Company records results from limited partnership investments on the equity method of accounting with changes in value reported through net investment income. Due to the timing of receiving financial information from these partnerships, the results are generally reported on a one month or quarter lag. If the Company determines there has been a significant decline in value of a limited partnership during this lag period, a loss will be recorded in the period in which the Company identifies the decline. The Company had contractual commitments to invest up to an additional $ 689,337 The Company's other invested assets at June 30, 2018 and December 31, 2017 included $ 387,160 447,915 The components of net realized capital gains (losses) are presented in the table below for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Fixed maturity securities, market value: Other-than-temporary impairments $ (888 ) $ (2,475 ) $ (958 ) $ (3,703 ) Gains (losses) from sales (43 ) 13,543 10,349 24,915 Fixed maturity securities, fair value: Gains (losses) from sales (1,068 ) - (1,082 ) - Gains (losses) from fair value adjustments 958 - 958 - Equity securities, market value: Gains (losses) from sales - - - (3,436 ) Equity securities, fair value: Gains (losses) from sales (1,563 ) 805 (1,523 ) 5,321 Gains (losses) from fair value adjustments 17,800 13,397 (17,453 ) 54,904 Other invested assets 581 (2 ) 584 (1 ) Short-term investments gain (loss) (1 ) - - (4 ) Total net realized capital gains (losses) $ 15,776 $ 25,268 $ (9,125 ) $ 77,996 The Company recorded as net realized capital gains (losses) in the consolidated statements of operations and comprehensive income (loss) both fair value re-measurements and write-downs in the value of securities deemed to be impaired on an other-than-temporary basis as displayed in the table above. The Company had no other-than-temporary impaired securities where the impairment had both a credit and non-credit component. The proceeds and split between gross gains and losses, from sales of fixed maturity and equity securities, are presented in the table below for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Proceeds from sales of fixed maturity securities $ 862,150 $ 562,718 $ 1,226,438 $ 991,209 Gross gains from sales 6,824 17,105 19,826 32,578 Gross losses from sales (7,935 ) (3,563 ) (10,559 ) (7,663 ) Proceeds from sales of equity securities $ 376,507 $ 117,911 $ 576,382 $ 277,028 Gross gains from sales 7,359 3,885 14,046 12,093 Gross losses from sales (8,922 ) (3,080 ) (15,569 ) (10,208 )

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	6 Months Ended
	Jun. 30, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Reserve For Losses LAE And Future Policy Benefit Reserve	4. RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE Activity in the reserve for losses and LAE is summarized for the periods indicated: Six Months Ended Twelve Months Ended June 30, December 31, (Dollars in thousands) 2018 2017 Gross reserves at beginning of period $ 11,884,321 $ 10,312,313 Less reinsurance recoverables (1,212,649 ) (990,862 ) Net reserves at beginning of period 10,671,672 9,321,451 Incurred related to: Current year 1,963,766 4,815,967 Prior years 434,725 (293,386 ) Total incurred losses and LAE 2,398,491 4,522,581 Paid related to: Current year 490,884 1,280,605 Prior years 2,089,606 2,062,634 Total paid losses and LAE 2,580,490 3,343,239 Foreign exchange/translation adjustment (67,978 ) 170,879 Net reserves at end of period 10,421,695 10,671,672 Plus reinsurance recoverables 1,621,639 1,212,649 Gross reserves at end of period $ 12,043,334 $ 11,884,321 Incurred prior years' reserves increased by $434,725 thousand for the six months ended June 30, 2018 and decreased by $293,386 thousand for the twelve months ended December 31, 2017. The increase for the six months ended June 30, 2018, was due to $ 532,155 97,430 238,378 37,137 55,007 The $ 408,990

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2018
Derivatives [Abstract]
Derivatives	5. DERIVATIVES The Company sold seven two One no The Company has five 2 zero 3 406,448 2,718.37 no The Company has one 10 zero 3 41,076 7,636.93 no At June 30, 2018 and December 31, 2017, the fair value for these equity put options was $ 9,218 12,477 The fair value of the equity index put options can be found in the Company's consolidated balance sheets as follows: (Dollars in thousands) Derivatives not designated as Location of fair value At At hedging instruments in balance sheets June 30, 2018 December 31, 2017 Equity index put option contracts Equity index put option liability $ 9,218 $ 12,477 Total $ 9,218 $ 12,477 The change in fair value of the equity index put option contracts can be found in the Company's statement of operations and comprehensive income (loss) as follows: (Dollars in thousands) For the Three Months Ended For the Six Months Ended Derivatives not designated as Location of gain (loss) in statements of June 30, June 30, hedging instruments operations and comprehensive income (loss) 2018 2017 2018 2017 Equity index put option contracts Net derivative gain (loss) $ 2,987 $ 766 $ 3,260 $ 3,396 Total $ 2,987 $ 766 $ 3,260 $ 3,396

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
Fair Value [Abstract]
Fair Value	6. FAIR VALUE GAAP guidance regarding fair value measurements address how companies should measure fair value when they are required to use fair value measures for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based on the transparency of inputs to the valuation of an asset or liability. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement, with Level 1 being the highest priority and Level 3 being the lowest priority. The levels in the hierarchy are defined as follows: Level 1: Inputs to the valuation methodology are observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in an active market; Level 2: Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument; Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The Company's fixed maturity and equity securities are primarily managed by third party investment asset managers. The investment asset managers obtain prices from nationally recognized pricing services. These services seek to utilize market data and observations in their evaluation process. They use pricing applications that vary by asset class and incorporate available market information and when fixed maturity securities do not trade on a daily basis the services will apply available information through processes such as benchmark curves, benchmarking of like securities, sector groupings and matrix pricing. In addition, they use model processes, such as the Option Adjusted Spread model to develop prepayment and interest rate scenarios for securities that have prepayment features. In limited instances where prices are not provided by pricing services or in rare instances when a manager may not agree with the pricing service, price quotes on a non-binding basis are obtained from investment brokers. The investment asset managers do not make any changes to prices received from either the pricing services or the investment brokers. In addition, the investment asset managers have procedures in place to review the reasonableness of the prices from the service providers and may request verification of the prices. In addition, the Company continually performs analytical reviews of price changes and tests the prices on a random basis to an independent pricing source. No material variances were noted during these price validation procedures. In limited situations, where financial markets are inactive or illiquid, the Company may use its own assumptions about future cash flows and risk-adjusted discount rates to determine fair value. Due to the unavailability of prices for ninety-one eighty-five 247,863 Four 95,444 two 53,715 sixty-six sixty-five 165,173 one 51,965 The Company internally manages a public equity portfolio which had a fair value at June 30, 2018 and December 31, 2017 of $ 490,863 386,241 Equity securities denominated in U.S. currency with quoted prices in active markets for identical assets are categorized as level 1 since the quoted prices are directly observable. Equity securities traded on foreign exchanges are categorized as level 2 due to the added input of a foreign exchange conversion rate to determine fair or market value. The Company uses foreign currency exchange rates published by nationally recognized sources. All categories of fixed maturity securities listed in the tables below are generally categorized as level 2, since a particular security may not have traded but the pricing services are able to use valuation models with observable market inputs such as interest rate yield curves and prices for similar fixed maturity securities in terms of issuer, maturity and seniority. For foreign government securities and foreign corporate securities, the fair values provided by the third party pricing services in local currencies, and where applicable, are converted to U.S. dollars using currency exchange rates from nationally recognized sources. The fixed maturities with fair values categorized as level 3 result when prices are not available from the nationally recognized pricing services. The asset managers will then obtain non-binding price quotes for the securities from brokers. The single broker quotes are provided by market makers or broker-dealers who are recognized as market participants in the markets in which they are providing the quotes. The prices received from brokers are reviewed for reasonableness by the third party asset managers and the Company. If the broker quotes are for foreign denominated securities, the quotes are converted to U.S. dollars using currency exchange rates from nationally recognized sources. In limited circumstances when broker prices are not available for private placements, the Company will value the securities using comparable market information or receive fair values from investment managers. The composition and valuation inputs for the presented fixed maturities categories are as follows: · U.S. Treasury securities and obligations of U.S. government agencies and corporations are primarily comprised of U.S. Treasury bonds and the fair value is based on observable market inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields; · Obligations of U.S. states and political subdivisions are comprised of state and municipal bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; · Corporate securities are primarily comprised of U.S. corporate and public utility bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities, benchmark yields and credit spreads; · Asset-backed and mortgage-backed securities fair values are based on observable inputs such as quoted prices, reported trades, quoted prices for similar issuances or benchmark yields and cash flow models using observable inputs such as prepayment speeds, collateral performance and default spreads; · Foreign government securities are comprised of global non-U.S. sovereign bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source; · Foreign corporate securities are comprised of global non-U.S. corporate bond issuances and the fair values are based on observable market inputs such as quoted market prices, quoted prices for similar securities and models with observable inputs such as benchmark yields and credit spreads and then, where applicable, converted to U.S. dollars using an exchange rate from a nationally recognized source. The Company sold seven two recorded in the consolidated statements of operations and comprehensive income (loss). One of these contracts expired on June 9, 2017, with no liability due under the terms of the contract. The Company's liability for equity index put options is categorized as level 3 since there is no active market for these equity put options. The fair values for these options are calculated by the Company using an industry accepted pricing model, Black-Scholes. The model inputs and assumptions are: risk free interest rates, equity market indexes values, volatilities and dividend yields and duration. The model results are then adjusted for the Company's credit default swap rate. All of these inputs and assumptions are updated quarterly. One of the option contacts is in British Pound Sterling so the fair value for this contract is converted to U.S. dollars using an exchange rate from a nationally recognized source. The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value (fair and market value) as of the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) June 30, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,144,496 $ - $ 1,144,496 $ - Obligations of U.S. States and political subdivisions 537,884 - 537,884 - Corporate securities 5,710,661 - 5,329,446 381,215 Asset-backed securities 485,956 - 485,956 - Mortgage-backed securities Commercial 222,975 - 222,975 - Agency residential 2,084,626 - 2,084,626 - Non-agency residential 60 - 60 - Foreign government securities 1,236,997 - 1,236,997 - Foreign corporate securities 2,819,235 - 2,806,620 12,615 Total fixed maturities, market value 14,242,890 - 13,849,060 393,830 Fixed maturities, fair value 3,192 - - 3,192 Equity securities, fair value 1,220,770 1,180,851 39,919 - Liabilities: Equity index put option contracts $ 9,218 $ - $ - $ 9,218 There were no The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value (fair and market value) as of the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2017 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,536,692 $ - $ 1,536,692 $ - Obligations of U.S. States and political subdivisions 585,469 - 585,469 - Corporate securities 5,699,005 - 5,488,819 210,186 Asset-backed securities 531,360 - 531,360 - Mortgage-backed securities Commercial 234,041 - 234,041 - Agency residential 2,210,902 - 2,210,902 - Non-agency residential 494 - 494 - Foreign government securities 1,314,027 - 1,314,027 - Foreign corporate securities 2,644,844 - 2,637,892 6,952 Total fixed maturities, market value 14,756,834 - 14,539,696 217,138 Equity securities, market value 129,530 113,506 16,024 - Equity securities, fair value 963,572 941,739 21,833 - Liabilities: Equity index put option contracts $ 12,477 $ - $ - $ 12,477 In addition, $ 96,162 79,505 The following tables present the activity under Level 3, fair value measurements using significant unobservable inputs by asset type, for the periods indicated: Total Fixed Maturities, Market Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 220,555 $ 11,368 $ 231,923 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 624 (504 ) 120 1,346 (410 ) 936 Included in other comprehensive income (loss) 190 - 190 425 - 425 Purchases, issuances and settlements 159,846 1 159,847 169,258 4,323 173,581 Transfers in and/or (out) of Level 3 - 1,750 1,750 - 1,750 1,750 Ending balance $ 381,215 $ 12,615 $ 393,830 $ 381,215 $ 12,615 $ 393,830 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 84,322 $ 2,802 $ 87,124 $ 65,197 $ 2,538 $ 67,735 Total gains or (losses) (realized/unrealized) Included in earnings 711 128 839 925 104 1,029 Included in other comprehensive income (loss) 172 - 172 143 - 143 Purchases, issuances and settlements 52,900 221 53,121 71,840 509 72,349 Transfers in and/or (out) of Level 3 - - - - - - Ending balance $ 138,105 $ 3,151 $ 141,256 $ 138,105 $ 3,151 $ 141,256 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at fair value $ 1,821 $ 1,821 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings (142 ) (142 ) (156 ) (156 ) Included in other comprehensive income (loss) 32 32 32 32 Purchases, issuances and settlements 1,481 1,481 3,316 3,316 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,192 $ 3,192 $ 3,192 $ 3,192 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at fair value $ - $ - $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings - - - - Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Ending balance $ - $ - $ - $ - The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) The net transfers to/(from) level 3, fair value measurements using significant unobservable inputs were $ 1,750 The following table presents the activity under Level 3, fair value measurements using significant unobservable inputs for equity index put option contracts, for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Liabilities: Balance, beginning of period $ 12,205 $ 19,429 $ 12,477 $ 22,059 Total (gains) or losses (realized/unrealized) Included in earnings (2,987 ) (766 ) (3,260 ) (3,396 ) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Balance, end of period $ 9,218 $ 18,662 $ 9,218 $ 18,662 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.)

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Common Share [Abstract]
Earnings Per Common Share	7. EARNINGS PER COMMON SHARE Basic earnings per share are calculated by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if options granted under various share-based compensation plans were exercised resulting in the issuance of common shares that would participate in the earnings of the entity. Net income (loss) per common share has been computed as per below, based upon weighted average common basic and dilutive shares outstanding. Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands, except per share amounts) 2018 2017 2018 2017 Net income (loss) per share: Numerator Net income (loss) $ 69,895 $ 245,674 $ 280,213 $ 537,317 Less: dividends declared-common shares and nonvested common shares (53,240 ) (51,304 ) (106,480 ) (102,585 ) Undistributed earnings 16,655 194,370 173,733 434,731 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 98.9 % 16,477 192,279 171,881 430,035 Add: dividends declared-common shareholders 52,705 50,790 105,403 101,543 Numerator for basic and diluted earnings per common share $ 69,183 $ 243,068 $ 277,284 $ 531,577 Denominator Denominator for basic earnings per weighted-average common shares 40,504 40,624 40,487 40,577 Effect of dilutive securities: Options 206 250 213 259 Denominator for diluted earnings per adjusted weighted-average common shares 40,710 40,874 40,699 40,836 Per common share net income (loss) Basic $ 1.71 $ 5.98 $ 6.85 $ 13.10 Diluted $ 1.70 $ 5.95 $ 6.81 $ 13.02 (1) 40,504 40,624 40,487 40,577 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,943 41,066 40,923 41,020 Percentage allocated to common shareholders 98.9 % 98.9 % 98.9 % 98.9 % (Some amounts may not reconcile due to rounding.) There were no All outstanding options expire on or between February 18, 2019 September 19, 2022

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies [Abstract]
Commitments And Contingencies	8. COMMITMENTS AND CONTINGENCIES In the ordinary course of business, the Company is involved in lawsuits, arbitrations and other formal and informal dispute resolution procedures, the outcomes of which will determine the Company's rights and obligations under insurance and reinsurance agreements. In some disputes, the Company seeks to enforce its rights under an agreement or to collect funds owing to it. In other matters, the Company is resisting attempts by others to collect funds or enforce alleged rights. These disputes arise from time to time and are ultimately resolved through both informal and formal means, including negotiated resolution, arbitration and litigation. In all such matters, the Company believes that its positions are legally and commercially reasonable. The Company considers the statuses of these proceedings when determining its reserves for unpaid loss and loss adjustment expenses. Aside from litigation and arbitrations related to these insurance and reinsurance agreements, the Company is not a party to any other material litigation or arbitration. The Company has entered into separate annuity agreements with The Prudential Insurance Company of America ("The Prudential") and an additional unaffiliated life insurance company in which the Company has either purchased annuity contracts or become the assignee of annuity proceeds that are meant to settle claim payment obligations in the future. In both instances, the Company would become contingently liable if either The Prudential or the unaffiliated life insurance company were unable to make payments related to the respective annuity contract. The table below presents the estimated cost to replace all such annuities for which the Company was contingently liable for the periods indicated: At June 30, At December 31, (Dollars in thousands) 2018 2017 The Prudential $ 144,353 $ 144,618 Unaffiliated life insurance company 33,372 34,444

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	9. OTHER COMPREHENSIVE INCOME (LOSS) The following tables present the components of comprehensive income (loss) in the consolidated statements of operations for the periods indicated: Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ (41,271 ) $ (906 ) $ (42,177 ) $ (250,431 ) $ 17,840 $ (232,591 ) URA(D) on securities - OTTI 456 (55 ) 401 267 (76 ) 191 Reclassification of net realized losses (gains) included in net income (loss) 350 (101 ) 249 (9,975 ) 1,452 (8,523 ) Foreign currency translation adjustments (69,202 ) 5,550 (63,652 ) (51,857 ) 5,904 (45,953 ) Reclassification of benefit plan liability amortization included in net income (loss) 2,297 (482 ) 1,815 4,595 (965 ) 3,630 Total other comprehensive income (loss) $ (107,370 ) $ 4,006 $ (103,364 ) $ (307,401 ) $ 24,155 $ (283,246 ) Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ (9,165 ) $ 14,916 $ 5,751 $ 22,041 $ 6,534 $ 28,575 URA(D) on securities - OTTI (994 ) 111 (883 ) (5,495 ) 1,336 (4,159 ) Reclassification of net realized losses (gains) included in net income (loss) (11,067 ) 2,074 (8,993 ) (17,775 ) 6,583 (11,192 ) Foreign currency translation adjustments 38,560 (2,893 ) 35,667 52,373 (4,813 ) 47,560 Reclassification of benefit plan liability amortization included in net income (loss) 3,083 (1,079 ) 2,004 6,166 (2,158 ) 4,008 Total other comprehensive income (loss) $ 20,417 $ 13,129 $ 33,546 $ 57,310 $ 7,482 $ 64,792 The following table presents details of the amounts reclassified from AOCI for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, Affected line item within the statements of AOCI component 2018 2017 2018 2017 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ 350 $ (11,067 ) $ (9,975 ) $ (17,775 ) Other net realized capital gains (losses) (101 ) 2,074 1,452 6,583 Income tax expense (benefit) $ 249 $ (8,993 ) $ (8,523 ) $ (11,192 ) Net income (loss) Benefit plan net gain (loss) $ 2,297 $ 3,083 $ 4,595 $ 6,166 Other underwriting expenses (482 ) (1,079 ) (965 ) (2,158 ) Income tax expense (benefit) $ 1,815 $ 2,004 $ 3,630 $ 4,008 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: Six Months Ended Twelve Months Ended June 30, December 31, (Dollars in thousands) 2018 2017 Beginning balance of URA (D) on securities $ 49,969 $ 115,558 Current period change in URA (D) of investments - temporary (241,114 ) (67,268 ) Current period change in URA (D) of investments - non-credit OTTI 191 (4,030 ) Reclass due to early adoption of ASU 2018-02 - 5,709 Cumulative change due to ASU 2016-01 (1,201 ) - Ending balance of URA (D) on securities (192,155 ) 49,969 Beginning balance of foreign currency translation adjustments (138,931 ) (266,818 ) Current period change in foreign currency translation adjustments (45,953 ) 121,917 Reclass due to early adoption of ASU 2018-02 - 5,970 Ending balance of foreign currency translation adjustments (184,884 ) (138,931 ) Beginning balance of benefit plan net gain (loss) (71,929 ) (65,504 ) Current period change in benefit plan net gain (loss) 3,630 6,504 Reclass due to early adoption of ASU 2018-02 - (12,929 ) Ending balance of benefit plan net gain (loss) (68,299 ) (71,929 ) Ending balance of accumulated other comprehensive income (loss) $ (445,338 ) $ (160,891 ) (Some amounts may not reconcile due to rounding.)

Credit Facilities

Credit Facilities	6 Months Ended
	Jun. 30, 2018
Credit Facilities [Abstract]
Credit Facilities	10. CREDIT FACILITIES The Company has two 1,050,000 Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Credit facility interest and fees incurred $ 105 $ 106 $ 210 $ 210 The terms and outstanding amounts for each facility are discussed below: Group Credit Facility Effective May 26, 2016 800,000 800,000 two 200,000 0.5 1.0 600,000 The Group Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 5,370,979 25 25 5,939,502 (Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 571,792 12/31/2018 600,000 538,214 12/31/2018 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 571,792 $ 800,000 $ 538,214 Bermuda Re Letter of Credit Facility Effective December 29, 2017 250,000 0.35 0.45 60 0.15 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 250,000 $ 3,672 11/24/2018 $ 250,000 $ 3,297 2/28/2018 64,126 12/31/2018 3,672 11/24/2018 2,412 2/28/2019 73,626 12/31/2018 328 8/30/2019 344 8/30/2019 2,416 12/31/2019 93,855 12/30/2021 91,905 6/30/2022 - Total Citibank Bilateral Agreement $ 250,000 $ 164,859 $ 250,000 $ 174,794 Everest International Credit Facility Effective November 9, 2016 four 145,000 0.1 0.35 The Everest International Credit Facility requires Group to maintain a debt to capital ratio of not greater than 0.35 5,326,009 70 25 25 5,939,502 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 145,000 £ - £ 145,000 £ - - - - - Total Lloyd's Bank Credit Facility £ 145,000 £ - £ 145,000 £ -

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	6 Months Ended
	Jun. 30, 2018
Collateralized Reinsurance And Trust Agreements [Abstract]
Collateralized Reinsurance And Trust Agreements	11. COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS Certain subsidiaries of Group have established trust agreements, which effectively use the Company's investments as collateral, as security for assumed losses payable to certain non-affiliated ceding companies. At June 30, 2018, the total amount on deposit in trust accounts was $ 897,645 The Company reinsures some of its catastrophe exposures with the segregated accounts of Mt. Logan Re. Mt. Logan Re is a Class 3 insurer registered in Bermuda effective February 27, 2013 under The Segregated Accounts Companies Act 2000 and 100 The following table summarizes the premiums and losses that are ceded by the Company to Mt. Logan Re segregated accounts and assumed by the Company from Mt. Logan Re segregated accounts. Three Months Ended Six Months Ended June 30, June 30, Mt. Logan Re Segregated Accounts 2018 2017 2018 2017 (Dollars in thousands) Ceded written premiums 45,887 42,728 126,923 96,946 Ceded earned premiums 65,067 57,886 126,476 98,483 Ceded losses and LAE 133,762 24,812 154,831 44,397 Assumed written premiums 1,604 3,763 4,647 6,495 Assumed earned premiums 1,604 3,763 4,647 6,495 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 $ 1,151,595 837,202 46,095 50,373 Effective April 1, 2018, the Company entered into a retroactive reinsurance transaction with one of the Mt. Logan Re segregated accounts to retrocede $ 269,198 252,000 319,000 On April 24, 2014, the Company entered into two 250,000 200,000 On November 18, 2014, the Company entered into a collateralized reinsurance agreement with Kilimanjaro to provide the Company with catastrophe reinsurance coverage. This agreement is a multi-year reinsurance contract which covers specified earthquake events. The agreement provides up to $ 500,000 On December 1, 2015 the Company entered into two 300,000 325,000 On April 13, 2017 the Company entered into six three four 225,000 400,000 325,000 three five 50,000 75,000 175,000 On April 30, 2018 the Company entered into four two four 62,500 200,000 two five 62,500 200,000 Recoveries under these collateralized reinsurance agreements with Kilimanjaro are primarily dependent on estimated industry level insured losses from covered events, as well as, the geographic location of the events. The estimated industry level of insured losses is obtained from published estimates by an independent recognized authority on insured property losses. As of December 31, 2017, none of the published insured loss estimates for the 2017 catastrophe events have exceeded the single event retentions under the terms of the agreements that would result in a recovery. In addition, the aggregation of the to-date published insured loss estimates for the 2017 covered events have not exceeded the aggregated retentions for recovery. However, if the published estimates for insured losses for the covered 2017 events increase, the aggregate losses may exceed the aggregate event retentions under the agreements resulting in a recovery. Kilimanjaro has financed the various property catastrophe reinsurance coverages by issuing catastrophe bonds to unrelated, external investors. On April 24, 2014, Kilimanjaro issued $ 450,000 450,000 500,000 625,000 950,000 300,000 262,500 262,500

Senior Notes

Senior Notes	6 Months Ended
	Jun. 30, 2018
Senior Notes [Abstract]
Senior Notes	12. SENIOR NOTES The table below displays Holdings' outstanding senior notes. Market value is based on quoted market prices, but due to limited trading activity, these senior notes are considered Level 2 in the fair value hierarchy. June 30, 2018 December 31, 2017 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,894 $ 396,728 $ 396,834 $ 420,340 On June 5, 2014, Holdings issued $400,000 thousand of 30 Interest expense incurred in connection with these senior notes is as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Interest expense incurred $ 4,868 $ 4,868 $ 9,736 $ 9,736

Long Term Subordinated Notes

Long Term Subordinated Notes	6 Months Ended
	Jun. 30, 2018
Long Term Subordinated Notes [Abstract]
Long Term Subordinated Notes	13. LONG TERM SUBORDINATED NOTES The table below displays Holdings' outstanding fixed to floating rate long term subordinated notes. Market value is based on quoted market prices, but due to limited trading activity, these subordinated notes are considered Level 2 in the fair value hierarchy. Maturity Date June 30, 2018 December 31, 2017 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,610 $ 236,651 $ 236,561 $ 233,072 During the fixed rate interest period from May 3, 2007 May 14, 2017 6.6 November 15, 2007 4.73 Holdings may redeem the long term subordinated notes on or after May 15, 2017, in whole or in part at 100 May 1, 2047 5.40 October 15, 2014 4.868 June 1, 2044 On March 19, 2009, Group announced the commencement of a cash tender offer for any and all of the 6.60% fixed to floating rate long term subordinated notes. Upon expiration of the tender offer, the Company had reduced its outstanding debt by $ 161,441 Interest expense incurred in connection with these long term subordinated notes is as follows for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Interest expense incurred $ 2,702 $ 3,033 $ 5,093 $ 6,970

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting	14. SEGMENT REPORTING The U.S. Reinsurance operation writes property and casualty reinsurance and specialty lines of business, including Marine, Aviation, Surety and Accident and Health ("A&H") business, on both a treaty and facultative basis, through reinsurance brokers, as well as directly with ceding companies primarily within the U.S. The International operation writes non-U.S. property and casualty reinsurance through Everest Re's branches in Canada and Singapore and through offices in Brazil, Miami and New Jersey. The Bermuda operation provides reinsurance and insurance to worldwide property and casualty markets through brokers and directly with ceding companies from its Bermuda office and reinsurance to the United Kingdom and European markets through its UK branch and Ireland Re. The Insurance operation writes property and casualty insurance directly and through brokers, surplus lines brokers and general agents within the U.S., Canada and Europe. These segments are managed independently, but conform with corporate guidelines with respect to pricing, risk management, control of aggregate catastrophe exposures, capital, investments and support operations. Management generally monitors and evaluates the financial performance of these operating segments based upon their underwriting results. Underwriting results include earned premium less losses and loss adjustment expenses ("LAE") incurred, commission and brokerage expenses and other underwriting expenses. We measure our underwriting results using ratios, in particular loss, commission and brokerage and other underwriting expense ratios, which, respectively, divide incurred losses, commissions and brokerage and other underwriting expenses by premiums earned. For inter-affiliate reinsurance and business written through the Lloyd's Syndicate, business is generally reported within the segment in which the business was first produced, consistent with how the business is managed. The Company does not maintain separate balance sheet data for its operating segments. Accordingly, the Company does not review and evaluate the financial results of its operating segments based upon balance sheet data. The following tables present the underwriting results for the operating segments for the periods indicated: Three Months Ended Six Months Ended U.S. Reinsurance June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 652,109 $ 474,993 $ 1,296,331 $ 1,053,951 Net written premiums 566,303 385,267 1,112,134 902,636 Premiums earned $ 603,884 $ 478,494 $ 1,167,269 $ 960,018 Incurred losses and LAE 509,653 267,621 1,054,846 529,687 Commission and brokerage 148,712 112,423 276,032 214,781 Other underwriting expenses 15,472 14,278 32,358 28,529 Underwriting gain (loss) $ (69,953 ) $ 84,172 $ (195,967 ) $ 187,021 Three Months Ended Six Months Ended International June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 399,024 $ 319,786 $ 765,748 $ 586,203 Net written premiums 355,309 272,369 700,464 518,031 Premiums earned $ 363,795 $ 263,816 $ 707,399 $ 535,397 Incurred losses and LAE 301,406 172,488 428,430 331,989 Commission and brokerage 92,088 64,847 174,265 130,997 Other underwriting expenses 10,349 9,814 20,925 19,294 Underwriting gain (loss) $ (40,048 ) $ 16,667 $ 83,779 $ 53,117 Three Months Ended Six Months Ended Bermuda June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 369,440 $ 237,570 $ 785,126 $ 558,692 Net written premiums 355,236 217,814 750,204 522,846 Premiums earned $ 353,698 $ 263,457 $ 672,832 $ 498,563 Incurred losses and LAE 250,097 165,305 379,610 293,737 Commission and brokerage 80,318 63,486 161,805 121,909 Other underwriting expenses 10,762 9,022 20,895 18,502 Underwriting gain (loss) $ 12,521 $ 25,644 $ 110,522 $ 64,415 Three Months Ended Six Months Ended Insurance June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 645,948 $ 569,300 $ 1,150,923 $ 1,003,747 Net written premiums 469,530 463,683 855,782 809,434 Premiums earned $ 408,441 $ 363,914 $ 801,745 $ 687,800 Incurred losses and LAE 280,158 255,861 535,605 476,650 Commission and brokerage 62,284 59,200 128,939 114,538 Other underwriting expenses 56,516 45,755 115,205 88,431 Underwriting gain (loss) $ 9,483 $ 3,098 $ 21,996 $ 8,181 The following table reconciles the underwriting results for the operating segments to income before taxes as reported in the consolidated statements of operations and comprehensive income (loss) for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Underwriting gain (loss) $ (87,997 ) $ 129,581 $ 20,330 $ 312,734 Net investment income 141,322 134,508 279,616 256,797 Net realized capital gains (losses) 15,776 25,268 (9,125 ) 77,996 Net derivative gain (loss) 2,987 766 3,260 3,396 Corporate expenses (6,633 ) (6,919 ) (15,629 ) (15,376 ) Interest, fee and bond issue cost amortization expense (7,728 ) (8,059 ) (15,146 ) (17,023 ) Other income (expense) 3,036 388 15,100 (4,578 ) Income (loss) before taxes $ 60,763 $ 275,533 $ 278,406 $ 613,946 The Company produces business in the U.S., Bermuda and internationally. The net income deriving from and assets residing in the individual foreign countries in which the Company writes business are not identifiable in the Company's financial records. Based on gross written premium, the table below presents the largest country, other than the U.S., in which the Company writes business, for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 United Kingdom gross written premium $ 177,072 $ 204,965 $ 435,331 $ 375,785 No other country represented more than 5

Share-Based Compensation Plans

Share-Based Compensation Plans	6 Months Ended
	Jun. 30, 2018
Share-Based Compensation Plans [Abstract]
Share-Based Compensation Plans	15. SHARE-BASED COMPENSATION PLANS For the three months ended June 30, 2018, share-based compensation awards granted were 375 May 15, 2018 226.950

Retirement Benefits

Retirement Benefits	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Retirement Benefits	16. RETIREMENT BENEFITS The Company maintains both qualified and non-qualified defined benefit pension plans and a retiree health plan for its U.S. employees employed prior to April 1, 2010. Net periodic benefit cost for U.S. employees included the following components for the periods indicated: Pension Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Service cost $ 2,977 $ 3,299 $ 5,954 $ 6,598 Interest cost 2,585 2,276 5,170 4,552 Expected return on plan assets (3,670 ) (3,154 ) (7,341 ) (6,309 ) Amortization of net (income) loss 2,237 3,041 4,473 6,081 Net periodic benefit cost $ 4,129 $ 5,461 $ 8,256 $ 10,921 Other Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Service cost $ 446 $ 441 $ 893 $ 881 Interest cost 307 249 614 498 Amortization of prior service cost (33 ) (33 ) (66 ) (66 ) Amortization of net (income) loss 94 75 188 151 Net periodic benefit cost $ 814 $ 732 $ 1,629 $ 1,464 (Some amounts may not reconcile due to rounding.) The service cost component of net periodic benefit costs is included within other underwriting expenses on the consolidated statement of operations and comprehensive income (loss). In accordance with ASU 2017-07, other staff compensation costs are also primarily recorded within this line item. The Company did not make any contributions to the qualified pension benefit plan for the three and six months ended June 30, 2018 and 2017.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Taxes [Abstract]
Income Taxes	17. INCOME TAXES The Company is domiciled in Bermuda and has significant subsidiaries and/or branches in Canada, Ireland, Singapore, 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 annual effective tax rate approach for calculating its tax provision for interim periods as prescribed by ASC 740-270, Interim Reporting. Under the estimated annual effective tax rate approach, the estimated annual effective tax rate is applied to the interim year-to-date pre-tax income/loss to determine the income tax expense or benefit for the year-to-date period. If the annual effective tax rate approach produces a year-to-date tax benefit which exceeds the amount which is estimated to be recoverable for the full year, then the tax benefit for the interim reporting period will be limited as prescribed under ASC 740-270 to the estimated recoverable based on the year-to-date result. The tax expense or benefit for the quarter represents the difference between the year-to-date tax expense or benefit for the current year-to-date period less such amount for the immediately preceding year-to-date period. Management considers the impact of all known events in its estimation of the Company's annual pre-tax income/loss and effective tax rate.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	18. SUBSEQUENT EVENTS The Company has evaluated known recognized and non-recognized subsequent events. The Company does not have any subsequent events to report.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2018
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At June 30, 2018 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,158,844 $ 10,522 $ (24,870 ) $ 1,144,496 $ - Obligations of U.S. states and political subdivisions 525,087 14,731 (1,934 ) 537,884 420 Corporate securities 5,783,255 50,084 (122,678 ) 5,710,661 2,740 Asset-backed securities 491,885 127 (6,056 ) 485,956 - Mortgage-backed securities Commercial 229,450 - (6,475 ) 222,975 - Agency residential 2,144,163 7,389 (66,926 ) 2,084,626 - Non-agency residential 22 38 - 60 - Foreign government securities 1,256,344 33,478 (52,825 ) 1,236,997 136 Foreign corporate securities 2,846,742 59,779 (87,286 ) 2,819,235 588 Total fixed maturity securities $ 14,435,792 $ 176,148 $ (369,050 ) $ 14,242,890 $ 3,884 Equity securities $ - $ - $ - $ - $ - At December 31, 2017 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,540,952 $ 9,816 $ (14,076 ) $ 1,536,692 $ - Obligations of U.S. states and political subdivisions 563,790 22,123 (444 ) 585,469 - Corporate securities 5,658,456 81,724 (41,175 ) 5,699,005 2,488 Asset-backed securities 532,473 869 (1,982 ) 531,360 - Mortgage-backed securities Commercial 235,794 616 (2,369 ) 234,041 - Agency residential 2,236,361 10,379 (35,838 ) 2,210,902 - Non-agency residential 497 41 (44 ) 494 - Foreign government securities 1,305,070 43,804 (34,847 ) 1,314,027 178 Foreign corporate securities 2,616,205 77,045 (48,406 ) 2,644,844 950 Total fixed maturity securities $ 14,689,598 $ 246,417 $ (179,181 ) $ 14,756,834 $ 3,616 Equity securities $ 130,287 $ 2,615 $ (3,372 ) $ 129,530 $ - (a)
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At June 30, 2018 At December 31, 2017 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,157,956 $ 1,158,176 $ 1,041,885 $ 1,050,094 Due after one year through five years 7,151,383 7,045,835 7,545,731 7,554,248 Due after five years through ten years 2,435,785 2,395,193 2,214,473 2,231,456 Due after ten years 825,148 850,069 882,384 944,239 Asset-backed securities 491,885 485,956 532,473 531,360 Mortgage-backed securities: Commercial 229,450 222,975 235,794 234,041 Agency residential 2,144,163 2,084,626 2,236,361 2,210,902 Non-agency residential 22 60 497 494 Total fixed maturity securities $ 14,435,792 $ 14,242,890 $ 14,689,598 $ 14,756,834
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ (40,921 ) $ (22,246 ) $ (260,406 ) $ (4,191 ) Fixed maturity securities, other-than-temporary impairment 456 (994 ) 267 (5,495 ) Equity securities - 1,193 - 7,192 Other invested assets - 821 - 1,265 Change in unrealized appreciation (depreciation), pre-tax (40,465 ) (21,226 ) (260,139 ) (1,229 ) Deferred tax benefit (expense) (1,007 ) 16,990 19,292 13,117 Deferred tax benefit (expense), other-than-temporary impairment (55 ) 111 (76 ) 1,336 Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ (41,527 ) $ (4,125 ) $ (240,923 ) $ 13,224
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type	Duration of Unrealized Loss at June 30, 2018 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 740,474 $ (14,053 ) $ 265,737 $ (10,817 ) $ 1,006,211 $ (24,870 ) Obligations of U.S. states and political subdivisions 45,254 (651 ) 36,939 (1,283 ) 82,193 (1,934 ) Corporate securities 3,629,848 (78,597 ) 807,050 (44,081 ) 4,436,898 (122,678 ) Asset-backed securities 315,541 (4,760 ) 92,906 (1,296 ) 408,447 (6,056 ) Mortgage-backed securities Commercial 156,895 (3,104 ) 66,079 (3,371 ) 222,974 (6,475 ) Agency residential 582,748 (11,118 ) 1,321,462 (55,808 ) 1,904,210 (66,926 ) Non-agency residential - - - - - - Foreign government securities 302,046 (8,212 ) 412,970 (44,613 ) 715,016 (52,825 ) Foreign corporate securities 1,332,956 (35,840 ) 584,790 (51,446 ) 1,917,746 (87,286 ) Total fixed maturity securities $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) Equity securities - - - - - - Total $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) Duration of Unrealized Loss at December 31, 2017 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,077,051 $ (8,380 ) $ 224,189 $ (5,696 ) $ 1,301,240 $ (14,076 ) Obligations of U.S. states and political subdivisions 4,400 (27 ) 37,886 (417 ) 42,286 (444 ) Corporate securities 1,779,292 (24,942 ) 700,098 (16,233 ) 2,479,390 (41,175 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities Commercial 101,821 (572 ) 64,272 (1,797 ) 166,093 (2,369 ) Agency residential 610,941 (4,836 ) 1,343,547 (31,002 ) 1,954,488 (35,838 ) Non-agency residential - - 69 (44 ) 69 (44 ) Foreign government securities 327,790 (12,811 ) 331,432 (22,036 ) 659,222 (34,847 ) Foreign corporate securities 691,865 (19,381 ) 450,860 (29,025 ) 1,142,725 (48,406 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 ) Equity securities - - 113,506 (3,372 ) 113,506 (3,372 ) Total $ 4,894,476 $ (72,416 ) $ 3,338,639 $ (110,137 ) $ 8,233,115 $ (182,553 )
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity	Duration of Unrealized Loss at June 30, 2018 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 628,144 $ (2,598 ) $ 149,820 $ (13,881 ) $ 777,964 $ (16,479 ) Due in one year through five years 3,911,655 (78,589 ) 1,547,737 (106,257 ) 5,459,392 (184,846 ) Due in five years through ten years 1,270,453 (42,618 ) 367,885 (29,885 ) 1,638,338 (72,503 ) Due after ten years 240,326 (13,548 ) 42,044 (2,217 ) 282,370 (15,765 ) Asset-backed securities 315,541 (4,760 ) 92,906 (1,296 ) 408,447 (6,056 ) Mortgage-backed securities 739,643 (14,222 ) 1,387,541 (59,179 ) 2,127,184 (73,401 ) Total fixed maturity securities $ 7,105,762 $ (156,335 ) $ 3,587,933 $ (212,715 ) $ 10,693,695 $ (369,050 ) Duration of Unrealized Loss at December 31, 2017 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 247,927 $ (962 ) $ 206,113 $ (7,643 ) $ 454,040 $ (8,605 ) Due in one year through five years 2,930,977 (42,480 ) 1,200,414 (52,143 ) 4,131,391 (94,623 ) Due in five years through ten years 612,702 (20,154 ) 292,245 (12,680 ) 904,947 (32,834 ) Due after ten years 88,792 (1,945 ) 45,693 (941 ) 134,485 (2,886 ) Asset-backed securities 301,316 (1,467 ) 72,780 (515 ) 374,096 (1,982 ) Mortgage-backed securities 712,762 (5,408 ) 1,407,888 (32,843 ) 2,120,650 (38,251 ) Total fixed maturity securities $ 4,894,476 $ (72,416 ) $ 3,225,133 $ (106,765 ) $ 8,119,609 $ (179,181 )
Summary Of Components Of Net Investment Income	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Fixed maturities $ 114,824 $ 108,122 $ 223,506 $ 211,367 Equity securities 6,672 8,366 13,499 17,111 Short-term investments and cash 2,092 835 3,824 1,465 Other invested assets Limited partnerships 21,996 20,060 45,377 31,058 Other 2,659 2,285 6,984 4,557 Gross investment income before adjustments 148,243 139,668 293,190 265,558 Funds held interest income (expense) 1,939 1,724 5,569 4,872 Future policy benefit reserve income (expense) (359 ) (416 ) (568 ) (735 ) Gross investment income 149,823 140,976 298,191 269,695 Investment expenses (8,501 ) (6,468 ) (18,575 ) (12,898 ) Net investment income $ 141,322 $ 134,508 $ 279,616 $ 256,797
Summary Of Components Of Net Realized Capital Gains (Losses)	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Fixed maturity securities, market value: Other-than-temporary impairments $ (888 ) $ (2,475 ) $ (958 ) $ (3,703 ) Gains (losses) from sales (43 ) 13,543 10,349 24,915 Fixed maturity securities, fair value: Gains (losses) from sales (1,068 ) - (1,082 ) - Gains (losses) from fair value adjustments 958 - 958 - Equity securities, market value: Gains (losses) from sales - - - (3,436 ) Equity securities, fair value: Gains (losses) from sales (1,563 ) 805 (1,523 ) 5,321 Gains (losses) from fair value adjustments 17,800 13,397 (17,453 ) 54,904 Other invested assets 581 (2 ) 584 (1 ) Short-term investments gain (loss) (1 ) - - (4 ) Total net realized capital gains (losses) $ 15,776 $ 25,268 $ (9,125 ) $ 77,996
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Proceeds from sales of fixed maturity securities $ 862,150 $ 562,718 $ 1,226,438 $ 991,209 Gross gains from sales 6,824 17,105 19,826 32,578 Gross losses from sales (7,935 ) (3,563 ) (10,559 ) (7,663 ) Proceeds from sales of equity securities $ 376,507 $ 117,911 $ 576,382 $ 277,028 Gross gains from sales 7,359 3,885 14,046 12,093 Gross losses from sales (8,922 ) (3,080 ) (15,569 ) (10,208 )

Reserve For Losses, LAE And F27

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	6 Months Ended
	Jun. 30, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	Six Months Ended Twelve Months Ended June 30, December 31, (Dollars in thousands) 2018 2017 Gross reserves at beginning of period $ 11,884,321 $ 10,312,313 Less reinsurance recoverables (1,212,649 ) (990,862 ) Net reserves at beginning of period 10,671,672 9,321,451 Incurred related to: Current year 1,963,766 4,815,967 Prior years 434,725 (293,386 ) Total incurred losses and LAE 2,398,491 4,522,581 Paid related to: Current year 490,884 1,280,605 Prior years 2,089,606 2,062,634 Total paid losses and LAE 2,580,490 3,343,239 Foreign exchange/translation adjustment (67,978 ) 170,879 Net reserves at end of period 10,421,695 10,671,672 Plus reinsurance recoverables 1,621,639 1,212,649 Gross reserves at end of period $ 12,043,334 $ 11,884,321

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2018
Derivatives [Abstract]
Summary Of The Fair Value Of The Equity Index Put Options	(Dollars in thousands) Derivatives not designated as Location of fair value At At hedging instruments in balance sheets June 30, 2018 December 31, 2017 Equity index put option contracts Equity index put option liability $ 9,218 $ 12,477 Total $ 9,218 $ 12,477 (Dollars in thousands) For the Three Months Ended For the Six Months Ended Derivatives not designated as Location of gain (loss) in statements of June 30, June 30, hedging instruments operations and comprehensive income (loss) 2018 2017 2018 2017 Equity index put option contracts Net derivative gain (loss) $ 2,987 $ 766 $ 3,260 $ 3,396 Total $ 2,987 $ 766 $ 3,260 $ 3,396

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value [Abstract]
Fair Value Measurement Levels For All Assets And Liabilities	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) June 30, 2018 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,144,496 $ - $ 1,144,496 $ - Obligations of U.S. States and political subdivisions 537,884 - 537,884 - Corporate securities 5,710,661 - 5,329,446 381,215 Asset-backed securities 485,956 - 485,956 - Mortgage-backed securities Commercial 222,975 - 222,975 - Agency residential 2,084,626 - 2,084,626 - Non-agency residential 60 - 60 - Foreign government securities 1,236,997 - 1,236,997 - Foreign corporate securities 2,819,235 - 2,806,620 12,615 Total fixed maturities, market value 14,242,890 - 13,849,060 393,830 Fixed maturities, fair value 3,192 - - 3,192 Equity securities, fair value 1,220,770 1,180,851 39,919 - Liabilities: Equity index put option contracts $ 9,218 $ - $ - $ 9,218 Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2017 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,536,692 $ - $ 1,536,692 $ - Obligations of U.S. States and political subdivisions 585,469 - 585,469 - Corporate securities 5,699,005 - 5,488,819 210,186 Asset-backed securities 531,360 - 531,360 - Mortgage-backed securities Commercial 234,041 - 234,041 - Agency residential 2,210,902 - 2,210,902 - Non-agency residential 494 - 494 - Foreign government securities 1,314,027 - 1,314,027 - Foreign corporate securities 2,644,844 - 2,637,892 6,952 Total fixed maturities, market value 14,756,834 - 14,539,696 217,138 Equity securities, market value 129,530 113,506 16,024 - Equity securities, fair value 963,572 941,739 21,833 - Liabilities: Equity index put option contracts $ 12,477 $ - $ - $ 12,477
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	Total Fixed Maturities, Market Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 220,555 $ 11,368 $ 231,923 $ 210,186 $ 6,952 $ 217,138 Total gains or (losses) (realized/unrealized) Included in earnings 624 (504 ) 120 1,346 (410 ) 936 Included in other comprehensive income (loss) 190 - 190 425 - 425 Purchases, issuances and settlements 159,846 1 159,847 169,258 4,323 173,581 Transfers in and/or (out) of Level 3 - 1,750 1,750 - 1,750 1,750 Ending balance $ 381,215 $ 12,615 $ 393,830 $ 381,215 $ 12,615 $ 393,830 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Market Value Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance fixed maturities at market value $ 84,322 $ 2,802 $ 87,124 $ 65,197 $ 2,538 $ 67,735 Total gains or (losses) (realized/unrealized) Included in earnings 711 128 839 925 104 1,029 Included in other comprehensive income (loss) 172 - 172 143 - 143 Purchases, issuances and settlements 52,900 221 53,121 71,840 509 72,349 Transfers in and/or (out) of Level 3 - - - - - - Ending balance $ 138,105 $ 3,151 $ 141,256 $ 138,105 $ 3,151 $ 141,256 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at fair value $ 1,821 $ 1,821 $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings (142 ) (142 ) (156 ) (156 ) Included in other comprehensive income (loss) 32 32 32 32 Purchases, issuances and settlements 1,481 1,481 3,316 3,316 Transfers in and/or (out) of Level 3 - - - - Ending balance $ 3,192 $ 3,192 $ 3,192 $ 3,192 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.) Total Fixed Maturities, Fair Value Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Foreign Foreign (Dollars in thousands) Corporate Total Corporate Total Beginning balance fixed maturities at fair value $ - $ - $ - $ - Total gains or (losses) (realized/unrealized) Included in earnings - - - - Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Ending balance $ - $ - $ - $ - The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.)
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Liabilities: Balance, beginning of period $ 12,205 $ 19,429 $ 12,477 $ 22,059 Total (gains) or losses (realized/unrealized) Included in earnings (2,987 ) (766 ) (3,260 ) (3,396 ) Included in other comprehensive income (loss) - - - - Purchases, issuances and settlements - - - - Transfers in and/or (out) of Level 3 - - - - Balance, end of period $ 9,218 $ 18,662 $ 9,218 $ 18,662 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to liabilities still held at the reporting date $ - $ - $ - $ - (Some amounts may not reconcile due to rounding.)

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Common Share [Abstract]
Schedule Of Net Income (Loss) Per Common Share	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands, except per share amounts) 2018 2017 2018 2017 Net income (loss) per share: Numerator Net income (loss) $ 69,895 $ 245,674 $ 280,213 $ 537,317 Less: dividends declared-common shares and nonvested common shares (53,240 ) (51,304 ) (106,480 ) (102,585 ) Undistributed earnings 16,655 194,370 173,733 434,731 Percentage allocated to common shareholders (1) 98.9 % 98.9 % 98.9 % 98.9 % 16,477 192,279 171,881 430,035 Add: dividends declared-common shareholders 52,705 50,790 105,403 101,543 Numerator for basic and diluted earnings per common share $ 69,183 $ 243,068 $ 277,284 $ 531,577 Denominator Denominator for basic earnings per weighted-average common shares 40,504 40,624 40,487 40,577 Effect of dilutive securities: Options 206 250 213 259 Denominator for diluted earnings per adjusted weighted-average common shares 40,710 40,874 40,699 40,836 Per common share net income (loss) Basic $ 1.71 $ 5.98 $ 6.85 $ 13.10 Diluted $ 1.70 $ 5.95 $ 6.81 $ 13.02 (1) 40,504 40,624 40,487 40,577 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,943 41,066 40,923 41,020 Percentage allocated to common shareholders 98.9 % 98.9 % 98.9 % 98.9 % (Some amounts may not reconcile due to rounding.)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At June 30, At December 31, (Dollars in thousands) 2018 2017 The Prudential $ 144,353 $ 144,618 Unaffiliated life insurance company 33,372 34,444

Other Comprehensive Income (L32

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Other Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ (41,271 ) $ (906 ) $ (42,177 ) $ (250,431 ) $ 17,840 $ (232,591 ) URA(D) on securities - OTTI 456 (55 ) 401 267 (76 ) 191 Reclassification of net realized losses (gains) included in net income (loss) 350 (101 ) 249 (9,975 ) 1,452 (8,523 ) Foreign currency translation adjustments (69,202 ) 5,550 (63,652 ) (51,857 ) 5,904 (45,953 ) Reclassification of benefit plan liability amortization included in net income (loss) 2,297 (482 ) 1,815 4,595 (965 ) 3,630 Total other comprehensive income (loss) $ (107,370 ) $ 4,006 $ (103,364 ) $ (307,401 ) $ 24,155 $ (283,246 ) Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (Dollars in thousands) Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Unrealized appreciation (depreciation) ("URA(D)") on securities - temporary $ (9,165 ) $ 14,916 $ 5,751 $ 22,041 $ 6,534 $ 28,575 URA(D) on securities - OTTI (994 ) 111 (883 ) (5,495 ) 1,336 (4,159 ) Reclassification of net realized losses (gains) included in net income (loss) (11,067 ) 2,074 (8,993 ) (17,775 ) 6,583 (11,192 ) Foreign currency translation adjustments 38,560 (2,893 ) 35,667 52,373 (4,813 ) 47,560 Reclassification of benefit plan liability amortization included in net income (loss) 3,083 (1,079 ) 2,004 6,166 (2,158 ) 4,008 Total other comprehensive income (loss) $ 20,417 $ 13,129 $ 33,546 $ 57,310 $ 7,482 $ 64,792
Reclassification From Accumulated Other Comprehensive Income	Three Months Ended Six Months Ended June 30, June 30, Affected line item within the statements of AOCI component 2018 2017 2018 2017 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ 350 $ (11,067 ) $ (9,975 ) $ (17,775 ) Other net realized capital gains (losses) (101 ) 2,074 1,452 6,583 Income tax expense (benefit) $ 249 $ (8,993 ) $ (8,523 ) $ (11,192 ) Net income (loss) Benefit plan net gain (loss) $ 2,297 $ 3,083 $ 4,595 $ 6,166 Other underwriting expenses (482 ) (1,079 ) (965 ) (2,158 ) Income tax expense (benefit) $ 1,815 $ 2,004 $ 3,630 $ 4,008 Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets	Six Months Ended Twelve Months Ended June 30, December 31, (Dollars in thousands) 2018 2017 Beginning balance of URA (D) on securities $ 49,969 $ 115,558 Current period change in URA (D) of investments - temporary (241,114 ) (67,268 ) Current period change in URA (D) of investments - non-credit OTTI 191 (4,030 ) Reclass due to early adoption of ASU 2018-02 - 5,709 Cumulative change due to ASU 2016-01 (1,201 ) - Ending balance of URA (D) on securities (192,155 ) 49,969 Beginning balance of foreign currency translation adjustments (138,931 ) (266,818 ) Current period change in foreign currency translation adjustments (45,953 ) 121,917 Reclass due to early adoption of ASU 2018-02 - 5,970 Ending balance of foreign currency translation adjustments (184,884 ) (138,931 ) Beginning balance of benefit plan net gain (loss) (71,929 ) (65,504 ) Current period change in benefit plan net gain (loss) 3,630 6,504 Reclass due to early adoption of ASU 2018-02 - (12,929 ) Ending balance of benefit plan net gain (loss) (68,299 ) (71,929 ) Ending balance of accumulated other comprehensive income (loss) $ (445,338 ) $ (160,891 ) (Some amounts may not reconcile due to rounding.)

Credit Facilities (Tables)

Credit Facilities (Tables)	6 Months Ended
	Jun. 30, 2018
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Credit facility interest and fees incurred $ 105 $ 106 $ 210 $ 210
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 571,792 12/31/2018 600,000 538,214 12/31/2018 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 571,792 $ 800,000 $ 538,214
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 250,000 $ 3,672 11/24/2018 $ 250,000 $ 3,297 2/28/2018 64,126 12/31/2018 3,672 11/24/2018 2,412 2/28/2019 73,626 12/31/2018 328 8/30/2019 344 8/30/2019 2,416 12/31/2019 93,855 12/30/2021 91,905 6/30/2022 - Total Citibank Bilateral Agreement $ 250,000 $ 164,859 $ 250,000 $ 174,794
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At June 30, 2018 At December 31, 2017 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 145,000 £ - £ 145,000 £ - - - - - Total Lloyd's Bank Credit Facility £ 145,000 £ - £ 145,000 £ -

Collateralized Reinsurance An34

Collateralized Reinsurance And Trust Agreements (Tables)	6 Months Ended
	Jun. 30, 2018
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Three Months Ended Six Months Ended June 30, June 30, Mt. Logan Re Segregated Accounts 2018 2017 2018 2017 (Dollars in thousands) Ceded written premiums 45,887 42,728 126,923 96,946 Ceded earned premiums 65,067 57,886 126,476 98,483 Ceded losses and LAE 133,762 24,812 154,831 44,397 Assumed written premiums 1,604 3,763 4,647 6,495 Assumed earned premiums 1,604 3,763 4,647 6,495 Assumed losses and LAE - - - -

Senior Notes (Tables)

Senior Notes (Tables)	6 Months Ended
	Jun. 30, 2018
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	June 30, 2018 December 31, 2017 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,894 $ 396,728 $ 396,834 $ 420,340
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Interest expense incurred $ 4,868 $ 4,868 $ 9,736 $ 9,736

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	6 Months Ended
	Jun. 30, 2018
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date June 30, 2018 December 31, 2017 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,610 $ 236,651 $ 236,561 $ 233,072
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Interest expense incurred $ 2,702 $ 3,033 $ 5,093 $ 6,970

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended Six Months Ended U.S. Reinsurance June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 652,109 $ 474,993 $ 1,296,331 $ 1,053,951 Net written premiums 566,303 385,267 1,112,134 902,636 Premiums earned $ 603,884 $ 478,494 $ 1,167,269 $ 960,018 Incurred losses and LAE 509,653 267,621 1,054,846 529,687 Commission and brokerage 148,712 112,423 276,032 214,781 Other underwriting expenses 15,472 14,278 32,358 28,529 Underwriting gain (loss) $ (69,953 ) $ 84,172 $ (195,967 ) $ 187,021 Three Months Ended Six Months Ended International June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 399,024 $ 319,786 $ 765,748 $ 586,203 Net written premiums 355,309 272,369 700,464 518,031 Premiums earned $ 363,795 $ 263,816 $ 707,399 $ 535,397 Incurred losses and LAE 301,406 172,488 428,430 331,989 Commission and brokerage 92,088 64,847 174,265 130,997 Other underwriting expenses 10,349 9,814 20,925 19,294 Underwriting gain (loss) $ (40,048 ) $ 16,667 $ 83,779 $ 53,117 Three Months Ended Six Months Ended Bermuda June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 369,440 $ 237,570 $ 785,126 $ 558,692 Net written premiums 355,236 217,814 750,204 522,846 Premiums earned $ 353,698 $ 263,457 $ 672,832 $ 498,563 Incurred losses and LAE 250,097 165,305 379,610 293,737 Commission and brokerage 80,318 63,486 161,805 121,909 Other underwriting expenses 10,762 9,022 20,895 18,502 Underwriting gain (loss) $ 12,521 $ 25,644 $ 110,522 $ 64,415 Three Months Ended Six Months Ended Insurance June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Gross written premiums $ 645,948 $ 569,300 $ 1,150,923 $ 1,003,747 Net written premiums 469,530 463,683 855,782 809,434 Premiums earned $ 408,441 $ 363,914 $ 801,745 $ 687,800 Incurred losses and LAE 280,158 255,861 535,605 476,650 Commission and brokerage 62,284 59,200 128,939 114,538 Other underwriting expenses 56,516 45,755 115,205 88,431 Underwriting gain (loss) $ 9,483 $ 3,098 $ 21,996 $ 8,181
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Underwriting gain (loss) $ (87,997 ) $ 129,581 $ 20,330 $ 312,734 Net investment income 141,322 134,508 279,616 256,797 Net realized capital gains (losses) 15,776 25,268 (9,125 ) 77,996 Net derivative gain (loss) 2,987 766 3,260 3,396 Corporate expenses (6,633 ) (6,919 ) (15,629 ) (15,376 ) Interest, fee and bond issue cost amortization expense (7,728 ) (8,059 ) (15,146 ) (17,023 ) Other income (expense) 3,036 388 15,100 (4,578 ) Income (loss) before taxes $ 60,763 $ 275,533 $ 278,406 $ 613,946
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 United Kingdom gross written premium $ 177,072 $ 204,965 $ 435,331 $ 375,785

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Summary Of Pension Expense	Pension Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Service cost $ 2,977 $ 3,299 $ 5,954 $ 6,598 Interest cost 2,585 2,276 5,170 4,552 Expected return on plan assets (3,670 ) (3,154 ) (7,341 ) (6,309 ) Amortization of net (income) loss 2,237 3,041 4,473 6,081 Net periodic benefit cost $ 4,129 $ 5,461 $ 8,256 $ 10,921 Other Benefits Three Months Ended Six Months Ended June 30, June 30, (Dollars in thousands) 2018 2017 2018 2017 Service cost $ 446 $ 441 $ 893 $ 881 Interest cost 307 249 614 498 Amortization of prior service cost (33 ) (33 ) (66 ) (66 ) Amortization of net (income) loss 94 75 188 151 Net periodic benefit cost $ 814 $ 732 $ 1,629 $ 1,464 (Some amounts may not reconcile due to rounding.)

Basis Of Presentation (Details)

Basis Of Presentation (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Item Effected [Line Items]
Cumulative change due to adoption of Accounting Standards Update 2016-01	$ (1,201)
Tax Cut and Jobs Act [Member]
Item Effected [Line Items]
U.S. tax rate	21.00%	35.00%
Reclass due to early adoption of Accounting Standards Update 2018-02	$ 1,250

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value	80.00%
Aggregate market value of investments in unrealized loss position	$ 10,693,695		$ 8,233,115
Gross unrealized losses on investments in unrealized loss position	369,050		182,553
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	156,335		72,416
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	212,715		110,137
Gross unrealized depreciation			0
Additional contractual commitments	689,337
Other invested assets	$ 1,826,148		1,631,850
Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	5.00%	5.00%
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Limited partnership financial reporting lag time, months	1 month
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Limited partnership financial reporting lag time, months	3 months
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	$ 135,754		103,739
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	207,796		68,107
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	10,693,695		8,119,609
Gross unrealized losses on investments in unrealized loss position	369,050		179,181
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	156,335		72,416
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 212,715		$ 106,765
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	1.10%		1.10%
Fixed Maturity Securities [Member] | Sales Revenue, Net [Member] | US Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold of unrealized losses not exceeded by any one single issuer	7.10%		8.90%
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Other invested assets	$ 387,160		$ 447,915

Investments (Summary Of Unreali

Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 14,435,792	$ 14,689,598
Unrealized Appreciation		176,148	246,417
Unrealized Depreciation		(369,050)	(179,181)
Market Value		14,242,890	14,756,834
OTTI in AOCI	[1]	3,884	3,616
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,158,844	1,540,952
Unrealized Appreciation		10,522	9,816
Unrealized Depreciation		(24,870)	(14,076)
Market Value		1,144,496	1,536,692
OTTI in AOCI	[1]
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		525,087	563,790
Unrealized Appreciation		14,731	22,123
Unrealized Depreciation		(1,934)	(444)
Market Value		537,884	585,469
OTTI in AOCI	[1]	420
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,783,255	5,658,456
Unrealized Appreciation		50,084	81,724
Unrealized Depreciation		(122,678)	(41,175)
Market Value		5,710,661	5,699,005
OTTI in AOCI	[1]	2,740	2,488
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		491,885	532,473
Unrealized Appreciation		127	869
Unrealized Depreciation		(6,056)	(1,982)
Market Value		485,956	531,360
OTTI in AOCI	[1]
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		229,450	235,794
Unrealized Appreciation			616
Unrealized Depreciation		(6,475)	(2,369)
Market Value		222,975	234,041
OTTI in AOCI	[1]
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,144,163	2,236,361
Unrealized Appreciation		7,389	10,379
Unrealized Depreciation		(66,926)	(35,838)
Market Value		2,084,626	2,210,902
OTTI in AOCI	[1]
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		22	497
Unrealized Appreciation		38	41
Unrealized Depreciation			(44)
Market Value		60	494
OTTI in AOCI	[1]
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,256,344	1,305,070
Unrealized Appreciation		33,478	43,804
Unrealized Depreciation		(52,825)	(34,847)
Market Value		1,236,997	1,314,027
OTTI in AOCI	[1]	136	178
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,846,742	2,616,205
Unrealized Appreciation		59,779	77,045
Unrealized Depreciation		(87,286)	(48,406)
Market Value		2,819,235	2,644,844
OTTI in AOCI	[1]	588	950
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			130,287
Unrealized Appreciation			2,615
Unrealized Depreciation			(3,372)
Market Value			129,530
OTTI in AOCI	[1]
[1]	Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date

Investments (Summary Of Amortiz

Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 14,435,792	$ 14,689,598
Fixed maturity securities - available for sale, Market Value	14,242,890	14,756,834
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	1,157,956	1,041,885
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	7,151,383	7,545,731
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	2,435,785	2,214,473
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	825,148	882,384
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,158,176	1,050,094
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	7,045,835	7,554,248
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,395,193	2,231,456
Fixed maturity securities - available for sale, Due after ten years, Market Value	850,069	944,239
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	491,885	532,473
Fixed maturity securities - available for sale, Market Value	485,956	531,360
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	229,450	235,794
Fixed maturity securities - available for sale, Market Value	222,975	234,041
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,144,163	2,236,361
Fixed maturity securities - available for sale, Market Value	2,084,626	2,210,902
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	22	497
Fixed maturity securities - available for sale, Market Value	$ 60	$ 494

Investments (Summary Of Changes

Investments (Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ (40,465)	$ (21,226)	$ (260,139)	$ (1,229)
Deferred tax benefit (expense)	(1,007)	16,990	19,292	13,117
Deferred tax benefit (expense), other-than-temporary impairment	(55)	111	(76)	1,336
Total URA(D) on securities arising during the period	(41,527)	(4,125)	(240,923)	13,224
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(40,921)	(22,246)	(260,406)	(4,191)
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	456	(994)	267	(5,495)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax		1,193		7,192
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax		$ 821		$ 1,265

Investments (Summary Of Aggrega

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	$ 7,105,762	$ 4,894,476
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(156,335)	(72,416)
Fixed maturity securities, Greater than 12 months, Market Value	3,587,933	3,338,639
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(212,715)	(110,137)
Fixed maturity securities, Total, Market Value	10,693,695	8,233,115
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(369,050)	(182,553)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	7,105,762	4,894,476
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(156,335)	(72,416)
Fixed maturity securities, Greater than 12 months, Market Value	3,587,933	3,225,133
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(212,715)	(106,765)
Fixed maturity securities, Total, Market Value	10,693,695	8,119,609
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(369,050)	(179,181)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	740,474	1,077,051
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(14,053)	(8,380)
Fixed maturity securities, Greater than 12 months, Market Value	265,737	224,189
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(10,817)	(5,696)
Fixed maturity securities, Total, Market Value	1,006,211	1,301,240
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(24,870)	(14,076)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	45,254	4,400
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(651)	(27)
Fixed maturity securities, Greater than 12 months, Market Value	36,939	37,886
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,283)	(417)
Fixed maturity securities, Total, Market Value	82,193	42,286
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,934)	(444)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	3,629,848	1,779,292
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(78,597)	(24,942)
Fixed maturity securities, Greater than 12 months, Market Value	807,050	700,098
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(44,081)	(16,233)
Fixed maturity securities, Total, Market Value	4,436,898	2,479,390
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(122,678)	(41,175)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	315,541	301,316
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(4,760)	(1,467)
Fixed maturity securities, Greater than 12 months, Market Value	92,906	72,780
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,296)	(515)
Fixed maturity securities, Total, Market Value	408,447	374,096
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(6,056)	(1,982)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	156,895	101,821
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(3,104)	(572)
Fixed maturity securities, Greater than 12 months, Market Value	66,079	64,272
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(3,371)	(1,797)
Fixed maturity securities, Total, Market Value	222,974	166,093
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(6,475)	(2,369)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	582,748	610,941
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(11,118)	(4,836)
Fixed maturity securities, Greater than 12 months, Market Value	1,321,462	1,343,547
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(55,808)	(31,002)
Fixed maturity securities, Total, Market Value	1,904,210	1,954,488
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(66,926)	(35,838)
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Greater than 12 months, Market Value		69
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation		(44)
Fixed maturity securities, Total, Market Value		69
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total		(44)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	302,046	327,790
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(8,212)	(12,811)
Fixed maturity securities, Greater than 12 months, Market Value	412,970	331,432
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(44,613)	(22,036)
Fixed maturity securities, Total, Market Value	715,016	659,222
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(52,825)	(34,847)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	1,332,956	691,865
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(35,840)	(19,381)
Fixed maturity securities, Greater than 12 months, Market Value	584,790	450,860
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(51,446)	(29,025)
Fixed maturity securities, Total, Market Value	1,917,746	1,142,725
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (87,286)	(48,406)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Greater than 12 months, Market Value		113,506
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation		(3,372)
Fixed maturity securities, Total, Market Value		113,506
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total		$ (3,372)

Investments (Summary Of Aggre45

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 7,105,762	$ 4,894,476
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(156,335)	(72,416)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,587,933	3,338,639
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(212,715)	(110,137)
Fixed maturity securities, Total, Market Value	10,693,695	8,233,115
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(369,050)	(182,553)
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	7,105,762	4,894,476
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(156,335)	(72,416)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,587,933	3,225,133
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(212,715)	(106,765)
Fixed maturity securities, Total, Market Value	10,693,695	8,119,609
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(369,050)	(179,181)
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	628,144	247,927
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(2,598)	(962)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	149,820	206,113
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(13,881)	(7,643)
Fixed maturity securities, Total, Market Value	777,964	454,040
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(16,479)	(8,605)
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	3,911,655	2,930,977
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(78,589)	(42,480)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,547,737	1,200,414
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(106,257)	(52,143)
Fixed maturity securities, Total, Market Value	5,459,392	4,131,391
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(184,846)	(94,623)
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	1,270,453	612,702
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(42,618)	(20,154)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	367,885	292,245
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(29,885)	(12,680)
Fixed maturity securities, Total, Market Value	1,638,338	904,947
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(72,503)	(32,834)
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	240,326	88,792
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(13,548)	(1,945)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	42,044	45,693
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,217)	(941)
Fixed maturity securities, Total, Market Value	282,370	134,485
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(15,765)	(2,886)
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	315,541	301,316
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(4,760)	(1,467)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	92,906	72,780
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,296)	(515)
Fixed maturity securities, Total, Market Value	408,447	374,096
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(6,056)	(1,982)
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	739,643	712,762
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(14,222)	(5,408)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,387,541	1,407,888
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(59,179)	(32,843)
Fixed maturity securities, Total, Market Value	2,127,184	2,120,650
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (73,401)	$ (38,251)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 148,243	$ 139,668	$ 293,190	$ 265,558
Funds held interest income (expense)	1,939	1,724	5,569	4,872
Future policy benefit reserve income (expense)	(359)	(416)	(568)	(735)
Gross investment income	149,823	140,976	298,191	269,695
Investment expenses	(8,501)	(6,468)	(18,575)	(12,898)
Net investment income	141,322	134,508	279,616	256,797
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	114,824	108,122	223,506	211,367
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	6,672	8,366	13,499	17,111
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	2,092	835	3,824	1,465
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	21,996	20,060	45,377	31,058
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 2,659	$ 2,285	$ 6,984	$ 4,557

Investments (Summary Of Compo47

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ (888)	$ (2,475)	$ (958)	$ (3,703)
Total net realized capital gains (losses)	15,776	25,268	(9,125)	77,996
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	(888)	(2,475)	(958)	(3,703)
Gains (losses) from sales	(43)	13,543	10,349	24,915
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,068)		(1,082)
Gains (losses) from fair value adjustments	958		958
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales				(3,436)
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,563)	805	(1,523)	5,321
Gains (losses) from fair value adjustments	17,800	13,397	(17,453)	54,904
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	581	$ (2)	$ 584	(1)
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ (1)			$ (4)

Investments (Summary Of Gross G

Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of fixed maturity securities	$ 862,150	$ 562,718	$ 1,226,438	$ 991,209
Gross gains from sales	6,824	17,105	19,826	32,578
Gross losses from sales	(7,935)	(3,563)	(10,559)	(7,663)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of fixed maturity securities	376,507	117,911	576,382	277,028
Gross gains from sales	7,359	3,885	14,046	12,093
Gross losses from sales	$ (8,922)	$ (3,080)	$ (15,569)	$ (10,208)

Reserve For Losses, LAE And F49

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business	$ 434,725	$ (293,386)
Partially offset, related to development on A&E reserves	97,430	37,137
Reinsurance Recoverables	1,621,639	1,212,649	$ 990,862
Property and Short-Tail Business [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		238,378
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business	532,155
Workers Compensation [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business		$ 55,007
Mt. Logan Re [Member] | Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Reinsurance Recoverables	$ 408,990

Reserve For Losses, LAE And F50

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves at beginning of period	$ 11,884,321	$ 10,312,313
(Less) Plus Reinsurance recoverable	(1,621,639)	(1,212,649)	$ (990,862)
Net reserves at beginning of period	10,671,672	9,321,451
Incurred related to: Current year	1,963,766	4,815,967
Incurred related to: Prior years	434,725	(293,386)
Total incurred losses and LAE	2,398,491	4,522,581
Paid related to: Current year	490,884	1,280,605
Paid related to: Prior years	2,089,606	2,062,634
Total paid losses and LAE	2,580,490	3,343,239
Foreign exchange/translation adjustment	(67,978)	170,879
Net reserves at end of period	10,421,695	10,671,672
Plus reinsurance recoverable	1,621,639	1,212,649
Gross reserves at end of period	$ 12,043,334	$ 11,884,321

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018USD ($)itemsecurity	Dec. 31, 2017USD ($)	Dec. 31, 2005security	Dec. 31, 2001security
Derivative [Line Items]
Number of equity index put option contracts	7		7	7
Number of equity indices | item	2
Equity index put option liability	$ 9,218,000	$ 12,477,000
Equity Index Put Option Contracts [Member]
Derivative [Line Items]
Number of equity index put option contracts | item	1
Equity index put option liability	$ 0
Equity Index Put Option Contracts [Member] | Fair Value [Member]
Derivative [Line Items]
Equity index put option liability	$ 9,218,000	$ 12,477,000
Standard & Poor's 500 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | security	5
Theoretical maximum payout occurs based on index value	$ 0
Present value of theoretical maximum payouts	406,448,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired	2,718.37
Standard & Poor's 500 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	2.00%
FTSE 100 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | security	1
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 41,076,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired | item	7,636.93
FTSE 100 Index [Member] | Maximum [Member]
Derivative [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date	10.00%

Derivatives (Summary Of The Fai

Derivatives (Summary Of The Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 9,218		$ 9,218		$ 12,477
Net derivative gain (loss)	2,987	$ 766	3,260	$ 3,396
Equity Index Put Option Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	9,218		9,218		$ 12,477
Net derivative gain (loss)	$ 2,987	$ 766	$ 3,260	$ 3,396

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)securityitem	Jun. 30, 2018USD ($)securityitem	Dec. 31, 2017USD ($)security	Dec. 31, 2005security	Dec. 31, 2001security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio	$ 490,863,000	$ 490,863,000	$ 386,241,000
Number of equity index put option contracts	7	7		7	7
Derivatives, Number Of Indices | item		2
Equity index put option liability	$ 9,218,000	$ 9,218,000	12,477,000
other invested assets	404,439,000	404,439,000	382,283,000
Transfers between level 1 and 2	0	0
Transfers from level 3	1,750,000	1,750,000
Accounting Standards Update 2015-07 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
other invested assets	$ 96,162,000	$ 96,162,000	$ 79,505,000
Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities | security	85	85	65
Private Placement [Member] | Amortized Cost [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities | security	4	4
Available-for-sale Securities	$ 95,444,000	$ 95,444,000
Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities | security	91	91	66
Available-for-sale Securities	$ 247,863,000	$ 247,863,000	$ 165,173,000
Standard & Poor's 500 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security	5	5
Theoretical maximum payout occurs based on index value	$ 0	$ 0
Present value of theoretical maximum payouts	406,448,000	406,448,000
Settlement amount if contracts had expired	$ 0	$ 0
FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | security	1	1
Theoretical maximum payout occurs based on index value	$ 0	$ 0
Discount factor		3.00%
Present value of theoretical maximum payouts	41,076,000	$ 41,076,000
Settlement amount if contracts had expired	$ 0	$ 0
Maximum [Member] | Standard & Poor's 500 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date		2.00%
Maximum [Member] | FTSE 100 Index [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimates the probability of equity index put option contract will falling below the strike price on the exercise date		10.00%
Par Value [Member] | Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities | security	2	2	1
Available-for-sale Securities	$ 53,715,000	$ 53,715,000	$ 51,965,000
Equity Index Put Option Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of equity index put option contracts | item	1	1
Equity index put option liability	$ 0	$ 0
Equity Index Put Option Contracts [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity index put option liability	$ 9,218,000	$ 9,218,000	$ 12,477,000

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 14,242,890	$ 14,756,834
Fixed maturities, fair value	3,192
Equity securities, market value		129,530
Equity securities, fair value	1,220,770	963,572
Equity index put option contracts	9,218	12,477
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value
Equity securities, market value		113,506
Equity securities, fair value	1,180,851	941,739
Equity index put option contracts
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value
Equity securities, market value		16,024
Equity securities, fair value	39,919	21,833
Equity index put option contracts
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, fair value	3,192
Equity securities, market value
Equity securities, fair value
Equity index put option contracts	9,218	12,477
Fixed Maturity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	14,242,890	14,756,834
Fixed Maturity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Fixed Maturity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	13,849,060	14,539,696
Fixed Maturity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	393,830	217,138
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,144,496	1,536,692
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,144,496	1,536,692
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Obligations Of U.S. States And Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	537,884	585,469
Obligations Of U.S. States And Political Subdivisions [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	537,884	585,469
Obligations Of U.S. States And Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	5,710,661	5,699,005
Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	5,329,446	5,488,819
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	381,215	210,186
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	485,956	531,360
Asset-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	485,956	531,360
Asset-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Commercial Mortgage-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	222,975	234,041
Commercial Mortgage-Backed Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Commercial Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	222,975	234,041
Commercial Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,084,626	2,210,902
Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,084,626	2,210,902
Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Non-Agency Residential [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	60	494
Non-Agency Residential [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Non-Agency Residential [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	60	494
Non-Agency Residential [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Foreign Government Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,236,997	1,314,027
Foreign Government Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Foreign Government Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,236,997	1,314,027
Foreign Government Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Foreign Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,819,235	2,644,844
Foreign Corporate Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value
Foreign Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	2,806,620	2,637,892
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 12,615	$ 6,952

Fair Value (Activity Under Leve

Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers in and/or (out) of Level 3	$ 1,750		$ 1,750
Market Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	231,923	$ 87,124	217,138	$ 67,735
Total gains or (losses) (realized/unrealized) Included in earnings	120	839	936	1,029
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	190	172	425	143
Purchases, issuances and settlements	159,847	53,121	173,581	72,349
Transfers in and/or (out) of Level 3	1,750		1,750
Ending balance	393,830	141,256	393,830	141,256
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	220,555	84,322	210,186	65,197
Total gains or (losses) (realized/unrealized) Included in earnings	624	711	1,346	925
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	190	172	425	143
Purchases, issuances and settlements	159,846	52,900	169,258	71,840
Transfers in and/or (out) of Level 3
Ending balance	381,215	138,105	381,215	138,105
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	11,368	2,802	6,952	2,538
Total gains or (losses) (realized/unrealized) Included in earnings	(504)	128	(410)	104
Purchases, issuances and settlements	1	221	4,323	509
Transfers in and/or (out) of Level 3	1,750		1,750
Ending balance	12,615	$ 3,151	12,615	$ 3,151
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	1,821
Total gains or (losses) (realized/unrealized) Included in earnings	(142)		(156)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	32		32
Purchases, issuances and settlements	1,481		3,316
Ending balance	3,192		3,192
Fair Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	1,821
Total gains or (losses) (realized/unrealized) Included in earnings	(142)		(156)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	32		32
Purchases, issuances and settlements	1,481		3,316
Ending balance	$ 3,192		$ 3,192

Fair Value (Fair Value Measur56

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value [Abstract]
Balance, beginning of period	$ 12,205	$ 19,429	$ 12,477	$ 22,059
Total (gains) or losses (realized/unrealized) Included in earnings	(2,987)	(766)	(3,260)	(3,396)
Balance, end of period	$ 9,218	$ 18,662	$ 9,218	$ 18,662

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Anti-dilutive options	0	0	0	0
Minimum [Member]
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Options expiration date			February 18, 2019
Maximum [Member]
Antidilutive Securities Excluded from Computation Of Earnings Per Share [Line Items]
Options expiration date			September 19, 2022

Earnings Per Common Share (Sche

Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Common Share [Abstract]
Net income (loss)	$ 69,895	$ 245,674	$ 280,213	$ 537,317
Less: dividends declared-common shares and nonvested common shares	(53,240)	(51,304)	(106,480)	(102,585)
Undistributed earnings	$ 16,655	$ 194,370	$ 173,733	$ 434,731
Percentage allocated to common shareholders	98.90%	98.90%	98.90%	98.90%
Net income (loss) available to common stockholders, total	$ 16,477	$ 192,279	$ 171,881	$ 430,035
Add: dividends declared-common shareholders	52,705	50,790	105,403	101,543
Numerator for basic and diluted earnings per common share	$ 69,183	$ 243,068	$ 277,284	$ 531,577
Denominator for basic earnings per weighted-average common shares	40,504	40,624	40,487	40,577
Effect of dilutive securities: Options	206	250	213	259
Denominator for diluted earnings per adjusted weighted-average common shares	40,710	40,874	40,699	40,836
Basic	$ 1.71	$ 5.98	$ 6.85	$ 13.10
Diluted	$ 1.70	$ 5.95	$ 6.81	$ 13.02
Basic weighted-average common shares outstanding	40,504	40,624	40,487	40,577
Basic weighted-average common shares outstanding and nonvested common shares expected to vest	40,943	41,066	40,923	41,020

Commitments And Contingencies59

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 144,353	$ 144,618
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 33,372	$ 34,444

Other Comprehensive Income (L60

Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ (107,370)	$ 20,417	$ (307,401)	$ 57,310
Total, Tax Effect	4,006	13,129	24,155	7,482
Total, Net of Tax	(103,364)	33,546	(283,246)	64,792
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(41,271)	(9,165)	(250,431)	22,041
Tax Effect	(906)	14,916	17,840	6,534
Net of Tax	(42,177)	5,751	(232,591)	28,575
Reclassification, Before Tax	350	(11,067)	(9,975)	(17,775)
Reclassification, Tax Effect	(101)	2,074	1,452	6,583
Reclassification, Net of Tax	249	(8,993)	(8,523)	(11,192)
Total, Net of Tax			(241,114)		$ (67,268)
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	456	(994)	267	(5,495)
Tax Effect	(55)	111	(76)	1,336
Net of Tax	401	(883)	191	(4,159)
Total, Net of Tax			191		(4,030)
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(69,202)	38,560	(51,857)	52,373
Tax Effect	5,550	(2,893)	5,904	(4,813)
Net of Tax	(63,652)	35,667	(45,953)	47,560
Total, Net of Tax			(45,953)		121,917
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification, Before Tax	2,297	3,083	4,595	6,166
Reclassification, Tax Effect	(482)	(1,079)	(965)	(2,158)
Reclassification, Net of Tax	$ 1,815	$ 2,004	3,630	$ 4,008
Total, Net of Tax			$ 3,630		$ 6,504

Other Comprehensive Income (L61

Other Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	$ 16,664	$ 27,743	$ (8,167)	$ 81,699
Income tax expense (benefit)	(9,132)	29,859	(1,807)	76,629
Net income (loss)	69,895	245,674	280,213	537,317
URA(D) On Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	350	(11,067)	(9,975)	(17,775)
Income tax expense (benefit)	(101)	2,074	1,452	6,583
Net income (loss)	249	(8,993)	(8,523)	(11,192)
URA(D) On Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	350	(11,067)	(9,975)	(17,775)
Income tax expense (benefit)	(101)	2,074	1,452	6,583
Net income (loss)	249	(8,993)	(8,523)	(11,192)
Benefit Plan Net Gain (Loss)[Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(482)	(1,079)	(965)	(2,158)
Other underwriting expenses	2,297	3,083	4,595	6,166
Income tax expense (benefit)	(482)	(1,079)	(965)	(2,158)
Net income (loss)	$ 1,815	$ 2,004	$ 3,630	$ 4,008

Other Comprehensive Income (L62

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		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 8,369,232
Current period change	$ (103,364)	$ 33,546	(283,246)	$ 64,792
Cumulative change due to ASU 2016-01	(1,201)		(1,201)
Balance, end of period	8,241,349	8,584,798	8,241,349	8,584,798	$ 8,369,232
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			49,969	115,558	115,558
Current period change			(241,114)		(67,268)
Balance, end of period	(192,155)		(192,155)		49,969
URA(D) On Securities [Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change					5,709
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change			191		(4,030)
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			(138,931)	(266,818)	(266,818)
Current period change			(45,953)		121,917
Balance, end of period	(184,884)		(184,884)		(138,931)
Foreign Currency Adjustment [Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change					5,970
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			(71,929)	(65,504)	(65,504)
Current period change			3,630		6,504
Balance, end of period	(68,299)		(68,299)		(71,929)
Benefit Plan Net Gain (Loss)[Member] | Reclass due to early adoption of ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change					(12,929)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(341,974)	(185,518)	(160,891)	(216,764)	(216,764)
Current period change	(103,364)	33,546	(283,246)	64,792
Cumulative change due to ASU 2016-01	1,201		1,201
Balance, end of period	$ (445,338)	$ (151,972)	$ (445,338)	$ (151,972)	$ (160,891)

Credit Facilities (Narrative) (

Credit Facilities (Narrative) (Details) £ in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018GBP (£)item	Dec. 31, 2017GBP (£)	Dec. 31, 2015	Jun. 30, 2018USD ($)item	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | item	2
Line of credit facility, commitment				$ 1,050,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	May 26, 2016
Line of credit facility, number of tranches | item	2			2
Line of credit facility, term of credit facility	4 years
Line of credit facility, commitment				$ 800,000	$ 800,000
Line of credit facility, required minimum debt-to-capital ratio	0.35			0.35
Line of credit facility, required minimum net worth				$ 5,370,979
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants	25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants	25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants				5,939,502
Wells Fargo Bank Group Credit Facility [Member] | Before Amended And Restated Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	5 years
Line of credit facility, commitment				800,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment				200,000	200,000
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Interest Rate Base Rate Option 1(b) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis	0.50%
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Interest Rate Base Rate Option 1(c) [Member]
Line of Credit Facility [Line Items]
Line of credit facility, spread on variable rate basis	1.00%
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Dec. 31, 2018	Dec. 31, 2018
Line of credit facility, commitment				600,000	600,000
Citibank Holdings Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	3 years
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, initiation date	Dec. 29, 2017
Line of credit facility, commitment				$ 250,000	$ 250,000
Per annum commitment fee on undrawn credit	0.15%
Citibank Bilateral Agreement [Member] | Interest Rate Base Rate Option 1(a) [Member]
Line of Credit Facility [Line Items]
Percentage of interest on the principal amount of letters of credit issued	0.35%
Maximum term allowed to execute issued letters of credit	15 months
Citibank Bilateral Agreement [Member] | Interest Rate Base Rate Option 1(b) [Member]
Line of Credit Facility [Line Items]
Percentage of interest on the principal amount of issued extended tenor letters of credit	0.45%
Maximum term allowed to execute issued letters of credit	60 months
Everest International Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, required minimum debt-to-capital ratio	0.35			0.35
Line of credit facility, required minimum net worth				$ 5,326,009
Consolidated net worth, percentage			70.00%
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants	25.00%
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants	25.00%
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants				$ 5,939,502
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, initiation date	Nov. 9, 2016
Line of credit facility, term of credit facility	4 years
Line of credit facility, commitment | £	£ 145,000	£ 145,000
Percentage commitment fee per annum	0.10%
Per annum commitment fee on undrawn credit	0.35%

Credit Facilities (Summary Of C

Credit Facilities (Summary Of Costs Incurred Connection With Credit Facilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Credit Facilities [Abstract]
Credit facility interest and fees incurred	$ 105	$ 106	$ 210	$ 210

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details) £ in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018GBP (£)	Dec. 31, 2017GBP (£)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Commitment			$ 1,050,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000	$ 200,000
In Use
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000	600,000
In Use			571,792	538,214
Date of Expiry	Dec. 31, 2018	Dec. 31, 2018
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000	800,000
In Use			571,792	538,214
Date of Expiry	May 26, 2016
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			250,000	250,000
In Use			3,672	3,297
Date of Expiry	Nov. 24, 2018	Feb. 28, 2018
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			64,126	3,672
Date of Expiry	Dec. 31, 2018	Nov. 24, 2018
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			2,412	73,626
Date of Expiry	Feb. 28, 2019	Dec. 31, 2018
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			328	344
Date of Expiry	Aug. 30, 2019	Aug. 30, 2019
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			2,416	93,855
Date of Expiry	Dec. 31, 2019	Dec. 30, 2021
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			91,905
Date of Expiry	Jun. 30, 2022
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			250,000	250,000
In Use			$ 164,859	$ 174,794
Lloyds Bank PLC [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 145,000	£ 145,000
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 145,000	£ 145,000

Collateralized Reinsurance An66

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands	Apr. 30, 2018USD ($)item	Apr. 01, 2018USD ($)	Apr. 13, 2017USD ($)item	Dec. 01, 2015USD ($)item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)item	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts							$ 897,645		$ 897,645
Preferred shares
Reinsurance coverage amount							45,887	$ 42,728
Kilimanjaro Re Limited [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item			6	2		2
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	4
Reinsurance coverage amount					$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 Through 3 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item			3
Reinsurance Contracts			4 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 And 2 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	2
Reinsurance Contracts	4 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 And 4 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	2
Reinsurance Contracts	5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 Through 6 [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item			3
Reinsurance Contracts			5 years
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 62,500		$ 225,000	$ 300,000		$ 250,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	200,000		400,000	325,000		200,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	62,500		325,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	200,000		50,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 5 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			75,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 6 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			175,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount						$ 450,000
Catastrophe Reinsurance Bonds Redeemed Amount	450,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount					$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2015-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount				$ 625,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount			950,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount			$ 300,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-1 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	262,500
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-2 Notes [Member]
Effects of Reinsurance [Line Items]
Catastrophe reinsurance bonds funded amount	$ 262,500
Mt. Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group									100.00%
Assumed net risk exposures									$ 1,151,595	837,202
Preferred shares							$ 46,095		$ 46,095	$ 50,373
Retrocede amount		$ 269,198
Cash transferred		252,000
Mt. Logan Re [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Retrocede amount		$ 319,000

Collateralized Reinsurance An67

Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 45,887	$ 42,728
Ceded earned premiums	65,067	57,886
Ceded losses and LAE	133,762	24,812
Assumed written premiums	1,604	3,763
Assumed earned premiums	1,604	3,763
Assumed losses and LAE
Mt. Logan Re Segregated Accounts [Member]
Effects of Reinsurance [Line Items]
Ceded written premiums			$ 126,923	$ 96,946
Ceded earned premiums			126,476	98,483
Ceded losses and LAE			154,831	44,397
Assumed written premiums			4,647	6,495
Assumed earned premiums			4,647	6,495
Assumed losses and LAE

Senior Notes (Narrative) (Detai

Senior Notes (Narrative) (Details) - Senior Notes [Member] - 4.868% Senior notes due 6/1/2044 [Member] - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Date Issued	Jun. 5, 2014
Principal amounts	$ 400,000,000
Debt Instrument, Term	30 years
Debt instrument, stated interest rate	4.868%	4.868%
Maturity Date	Jun. 1, 2044

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 396,894,000	$ 396,834,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%	4.868%
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044
Principal amounts	$ 400,000,000
Consolidated balance sheet amount	396,894,000	$ 396,834,000
Market value	$ 396,728,000	$ 420,340,000

Senior Notes (Schedule Of Inter

Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Senior Notes [Abstract]
Interest expense incurred	$ 4,868	$ 4,868	$ 9,736	$ 9,736

Long Term Subordinated Notes (N

Long Term Subordinated Notes (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Redemption date	May 1, 2047
6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%	6.60%
Maturity Date	May 1, 2067
Reset quarterly interest rate	4.73%
Percentage of principal amount required for redemption	100.00%
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Outstanding debt reduction	$ 161,441
Fixed Rate Interest Period [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%
Interest payment commencement date	Nov. 15, 2007
Interest basis, term of LIBOR rate	3 months
Interest basis, 3 month LIBOR plus number of basis points, reset quarterly	2.385%
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Fixed Rate Interest Period [Member] | 6.6 % Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Fixed Rate Interest Period [Member] | 6.6 % Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
5.4% Senior notes due 10/15/2014 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.40%
Maturity Date	Oct. 15, 2014
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%	4.868%
Maturity Date	Jun. 1, 2044

Long Term Subordinated Notes (S

Long Term Subordinated Notes (Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 236,610,000	$ 236,561,000
6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%	6.60%
Date Issued	Apr. 26, 2007
Original Principal Amount	$ 400,000,000
Maturity Date	May 1, 2067
Consolidated balance sheet amount	$ 236,610,000	$ 236,561,000
Market value	$ 236,651,000	$ 233,072,000
Scheduled [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037
Final [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 1, 2067

Long Term Subordinated Notes 73

Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Long Term Subordinated Notes [Abstract]
Interest expense incurred	$ 2,702	$ 3,033	$ 5,093	$ 6,970

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Premiums earned	$ 1,729,818	$ 1,369,681	$ 3,349,245	$ 2,681,778
Incurred losses and LAE	1,341,314	861,275	2,398,491	1,632,063
Commission and brokerage	383,402	299,956	741,041	582,225
Other underwriting expenses	93,099	78,869	189,383	154,756
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	652,109	474,993	1,296,331	1,053,951
Net written premiums	566,303	385,267	1,112,134	902,636
Premiums earned	603,884	478,494	1,167,269	960,018
Incurred losses and LAE	509,653	267,621	1,054,846	529,687
Commission and brokerage	148,712	112,423	276,032	214,781
Other underwriting expenses	15,472	14,278	32,358	28,529
Underwriting gain (loss)	(69,953)	84,172	(195,967)	187,021
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums	399,024	319,786	765,748	586,203
Net written premiums	355,309	272,369	700,464	518,031
Premiums earned	363,795	263,816	707,399	535,397
Incurred losses and LAE	301,406	172,488	428,430	331,989
Commission and brokerage	92,088	64,847	174,265	130,997
Other underwriting expenses	10,349	9,814	20,925	19,294
Underwriting gain (loss)	(40,048)	16,667	83,779	53,117
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums	369,440	237,570	785,126	558,692
Net written premiums	355,236	217,814	750,204	522,846
Premiums earned	353,698	263,457	672,832	498,563
Incurred losses and LAE	250,097	165,305	379,610	293,737
Commission and brokerage	80,318	63,486	161,805	121,909
Other underwriting expenses	10,762	9,022	20,895	18,502
Underwriting gain (loss)	12,521	25,644	110,522	64,415
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	645,948	569,300	1,150,923	1,003,747
Net written premiums	469,530	463,683	855,782	809,434
Premiums earned	408,441	363,914	801,745	687,800
Incurred losses and LAE	280,158	255,861	535,605	476,650
Commission and brokerage	62,284	59,200	128,939	114,538
Other underwriting expenses	56,516	45,755	115,205	88,431
Underwriting gain (loss)	$ 9,483	$ 3,098	$ 21,996	$ 8,181

Segment Reporting (Schedule O75

Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net investment income	$ 141,322	$ 134,508	$ 279,616	$ 256,797
Net realized capital gains (losses)	15,776	25,268	(9,125)	77,996
Net derivative gain (loss)	2,987	766	3,260	3,396
Corporate expenses	(6,633)	(6,919)	(15,629)	(15,376)
Interest, fee and bond issue cost amortization expense	(7,728)	(8,059)	(15,146)	(17,023)
Other income (expense)	3,036	388	15,100	(4,578)
INCOME (LOSS) BEFORE TAXES	60,763	275,533	278,406	613,946
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	(87,997)	129,581	20,330	312,734
Net investment income	141,322	134,508	279,616	256,797
Net realized capital gains (losses)	15,776	25,268	(9,125)	77,996
Net derivative gain (loss)	2,987	766	3,260	3,396
Corporate expenses	(6,633)	(6,919)	(15,629)	(15,376)
Interest, fee and bond issue cost amortization expense	(7,728)	(8,059)	(15,146)	(17,023)
Other income (expense)	3,036	388	15,100	(4,578)
INCOME (LOSS) BEFORE TAXES	$ 60,763	$ 275,533	$ 278,406	$ 613,946

Segment Reporting (Schedule O76

Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
United Kingdom Gross Written Premium [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 177,072	$ 204,965	$ 435,331	$ 375,785

Share-Based Compensation Plans

Share-Based Compensation Plans (Narrative) (Details) - Restricted Shares [Member]	3 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards, number of restricted shares granted | shares	375
Share-based compensation awards, grant date	May 15, 2018
Share-based compensation awards, per option fair value | $ / shares	$ 226.950

Retirement Benefits (Summary Of

Retirement Benefits (Summary Of Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,977	$ 3,299	$ 5,954	$ 6,598
Interest cost	2,585	2,276	5,170	4,552
Expected return on plan assets	(3,670)	(3,154)	(7,341)	(6,309)
Amortization of net (income) loss	2,237	3,041	4,473	6,081
Net periodic benefit cost	4,129	5,461	8,256	10,921
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	446	441	893	881
Interest cost	307	249	614	498
Amortization of prior service cost	(33)	(33)	(66)	(66)
Amortization of net (income) loss	94	75	188	151
Net periodic benefit cost	$ 814	$ 732	$ 1,629	$ 1,464