Everest Re (EG) 10-Q 10 May 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
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		41,069,286

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS:
Fixed maturities - available for sale, at market value (amortized cost: 2017, $14,542,645; 2016, $13,932,613)	$ 14,730,995	$ 14,107,408
Equity securities - available for sale, at market value (cost: 2017, $108,834; 2016, $129,553)	104,346	119,067
Equity securities - available for sale, at fair value	983,459	1,010,085
Short-term investments	477,177	431,478
Other invested assets (cost: 2017, $1,358,749; 2016, $1,333,069)	1,359,252	1,333,129
Cash	468,240	481,922
Total investments and cash	18,123,469	17,483,089
Accrued investment income	98,169	96,473
Premiums receivable	1,707,232	1,485,990
Reinsurance receivables	1,050,540	1,018,325
Funds held by reinsureds	262,111	260,644
Deferred acquisition costs	347,337	344,052
Prepaid reinsurance premiums	215,749	191,768
Income taxes	135,050	177,704
Other assets	253,296	263,459
TOTAL ASSETS	22,192,953	21,321,504
LIABILITIES:
Reserve for losses and loss adjustment expenses	10,414,046	10,312,313
Future policy benefit reserve	55,158	55,074
Unearned premium reserve	1,704,734	1,577,546
Funds held under reinsurance treaties	23,201	21,278
Commission reserves	59,266	70,335
Other net payable to reinsurers	207,592	190,986
Losses in course of payment	181,331	67,107
4.868% Senior notes due 6/1/2044	396,744	396,714
6.6% Long term notes due 5/1/2067	236,487	236,462
Accrued interest on debt and borrowings	12,341	3,537
Equity index put option liability	19,429	22,059
Unsettled securities payable	272,470	27,927
Other liabilities	262,278	264,770
Total liabilities	13,845,077	13,246,108
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; (2017) 69,030 and (2016) 68,871 outstanding before treasury shares	691	689
Additional paid-in capital	2,141,653	2,140,783
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) of $13,886 at 2017 and $8,240 at 2016	(185,518)	(216,764)
Treasury shares, at cost; 27,972 shares 2017 and 2016	(3,272,244)	(3,272,244)
Retained earnings	9,663,294	9,422,932
Total shareholders' equity	8,347,876	8,075,396
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 22,192,953	$ 21,321,504

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fixed maturities - available for sale, at market value, amortized cost	$ 14,542,645	$ 13,932,613
Equity securities - available for sale, at market value, cost	108,834	129,553
Other invested assets, at cost	$ 1,358,749	$ 1,333,069
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	50,000,000	50,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0
Common shares, par value	$ 0.01	$ 0.01
Common shares, authorized	200,000,000	200,000,000
Common shares, outstanding	69,030,000	68,871,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit)	$ 13,886	$ 8,240
Treasury shares	27,972,000	27,972,000
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
	Mar. 31, 2017	Mar. 31, 2016
REVENUES:
Premiums earned	$ 1,312,097	$ 1,218,867
Net investment income	122,289	102,524
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	(1,229)	(28,793)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	53,957	(45,466)
Total net realized capital gains (losses)	52,728	(74,259)
Net derivative gain (loss)	2,630	(3,020)
Other income (expense)	(4,966)	(2,066)
Total revenues	1,484,778	1,242,046
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	770,788	700,749
Commission, brokerage, taxes and fees	282,269	275,006
Other underwriting expenses	75,887	72,110
Corporate expenses	8,457	7,886
Interest, fees and bond issue cost amortization expense	8,964	9,228
Total claims and expenses	1,146,365	1,064,979
INCOME (LOSS) BEFORE TAXES	338,413	177,067
Income tax expense (benefit)	46,770	5,381
NET INCOME (LOSS)	291,643	171,686
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	19,548	142,962
Reclassification adjustment for realized losses (gains) included in net income (loss)	(2,199)	32,381
Total URA(D) on securities arising during the period	17,349	175,343
Foreign currency translation adjustments	11,893	9,773
Benefit plan actuarial net gain (loss) for the period
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	2,004	1,340
Total benefit plan net gain (loss) for the period	2,004	1,340
Total other comprehensive income (loss), net of tax	31,246	186,456
COMPREHENSIVE INCOME (LOSS)	$ 322,889	$ 358,142
EARNINGS PER COMMON SHARE:
Basic	$ 7.12	$ 4.03
Diluted	7.07	4
Dividends declared	$ 1.25	$ 1.15

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, 2015	42,694,252
Issued during the period, shares	169,774
Treasury shares acquired, shares	(464,360)
Balance, beginning of period at Dec. 31, 2015	$ 686	$ 2,103,638	$ (231,755)	$ 8,621,972	$ (2,885,956)
Issued during the period, net	$ 2
Share-based compensation plans		8,190
Net increase (decrease) during the period			186,456			$ 186,456
Net income (loss)				171,686		171,686
Dividends declared ($1.25 per share in 2017 and $1.15 per share in 2016)				(48,706)		(48,706)
Purchase of treasury shares					(85,914)
Balance, end of period, shares at Mar. 31, 2016	42,399,666
Balance, end of period at Mar. 31, 2016	$ 688	2,111,828	(45,299)	8,744,952	(2,971,870)	$ 7,840,299
Balance, beginning of period, shares at Dec. 31, 2015	42,694,252
Balance, beginning of period at Dec. 31, 2015	$ 686	2,103,638	(231,755)	8,621,972	(2,885,956)
Balance, end of period, shares at Dec. 31, 2016	40,898,864					68,871,000
Balance, end of period at Dec. 31, 2016	$ 689	2,140,783	(216,764)	9,422,932	(3,272,244)	$ 8,075,396
Issued during the period, shares	159,127
Issued during the period, net	$ 2
Share-based compensation plans		870
Net increase (decrease) during the period			31,246			31,246
Net income (loss)				291,643		291,643
Dividends declared ($1.25 per share in 2017 and $1.15 per share in 2016)				(51,281)		$ (51,281)
Purchase of treasury shares
Balance, end of period, shares at Mar. 31, 2017	41,057,991					69,030,000
Balance, end of period at Mar. 31, 2017	$ 691	$ 2,141,653	$ (185,518)	$ 9,663,294	$ (3,272,244)	$ 8,347,876

Consolidated Statements Of Cha6

Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Dividends declared	$ 1.25	$ 1.15

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 291,643	$ 171,686
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in premiums receivable	(220,367)	7,604
Decrease (increase) in funds held by reinsureds, net	1,211	60,592
Decrease (increase) in reinsurance receivables	(30,158)	(32,865)
Decrease (increase) in income taxes	37,010	(3,883)
Decrease (increase) in prepaid reinsurance premiums	(23,704)	(10,219)
Increase (decrease) in reserve for losses and loss adjustment expenses	99,095	50,497
Increase (decrease) in future policy benefit reserve	83	(473)
Increase (decrease) in unearned premiums	125,614	(26,116)
Increase (decrease) in other net payable to reinsurers	13,666	5,254
Increase (decrease) in losses in course of payment	113,815	24,473
Change in equity adjustments in limited partnerships	(10,998)	6,181
Distribution of limited partnership income	5,384	15,915
Change in other assets and liabilities, net	12,998	12,175
Non-cash compensation expense	7,501	8,041
Amortization of bond premium (accrual of bond discount)	11,746	12,354
Amortization of underwriting discount on senior notes	1	1
Net realized capital (gains) losses	(52,728)	74,259
Net cash provided by (used in) operating activities	381,812	375,476
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from fixed maturities matured/called - available for sale, at market value	525,873	503,428
Proceeds from fixed maturities sold - available for sale, at market value	428,491	324,118
Proceeds from equity securities sold - available for sale, at market value	18,802	203
Proceeds from equity securities sold - available for sale, at fair value	140,315	92,245
Distributions from other invested assets	1,165,905	1,111,710
Cost of fixed maturities acquired - available for sale, at market value	(1,552,743)	(1,078,990)
Cost of equity securities acquired - available for sale, at market value	(1,282)	(1,105)
Cost of equity securities acquired - available for sale, at fair value	(66,902)	(96,297)
Cost of other invested assets acquired	(1,184,270)	(1,454,123)
Net change in short-term investments	(45,178)	360,238
Net change in unsettled securities transactions	236,702	30,390
Net cash provided by (used in) investing activities	(334,287)	(208,183)
CASH FLOWS FROM FINANCING ACTIVITIES:
Common shares issued during the period, net	(6,629)	151
Purchase of treasury shares		(85,914)
Dividends paid to shareholders	(51,281)	(48,706)
Cost of shares withheld for taxes on settlements of share-based compensation awards	(11,517)	(8,331)
Net cash provided by (used in) financing activities	(69,427)	(142,800)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	8,220	20,792
Net increase (decrease) in cash	(13,682)	45,285
Cash, beginning of period	481,922	283,658
Cash, end of period	468,240	328,943
SUPPLEMENTAL CASH FLOW INFORMATION:
Income taxes paid (recovered)	9,593	5,000
Interest paid	$ 105	$ 370

General

General	3 Months Ended
	Mar. 31, 2017
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 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 August 24, 2016, the Company sold its wholly-owned subsidiary, Heartland Crop Insurance Company ("Heartland"), a managing agent for crop insurance, to CGB Diversified Services, Inc. ("CGB"). The operating results of Heartland through August 24, 2016, are included within the Company's financial statements. Effective July 1, 2016, the Company established a new Irish holding company, Everest Dublin Insurance Holdings Limited (Ireland) ("Everest Dublin Holdings"). During the fourth quarter of 2015, the Company established new subsidiaries, Everest Preferred International Holdings, Ltd. ("Preferred International"), a Bermuda based company and Everest International Holdings (Bermuda), Ltd. ("International Holdings"), a Bermuda based company. These new subsidiaries were part of a capital restructuring within the Company to support a planned increase in international business production, which includes directly supporting Group's new Lloyd's of London Syndicate corporate member. Effective July 13, 2015, the Company sold all of the outstanding shares of capital stock of a wholly-owned subsidiary entity, Mt. McKinley Insurance Company ("Mt. McKinley"), to Clearwater Insurance Company. The operating results of Mt. McKinley through July 13, 2015 are included within the Company's financial statements.

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2017
Basis Of Presentation[Abstract]
Basis Of Presentation	2. BASIS OF PRESENTATION The unaudited consolidated financial statements of the Company for the three months ended March 31, 2017 and 2016 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, 2016 consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP. The results for the three months ended March 31, 2017 and 2016 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, 2016, 2015 and 2014 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. Effective January 1, 2016, the Company adopted Accounting Standards Update 2015-02, "Consolidation (Topic 810) Amendments to the Consolidation Analysis" The amended guidance includes changes in the identification of the primary beneficiary of companies considered to be VIEs. These changes resulted in the Company concluding that Mt. Logan Re is a VIE given it has insufficient equity at risk and that each underlying separate segregated account is likewise a VIE. The Company has concluded that it is the primary beneficiary of Mt. Logan Re, but not of the underlying separate segregated accounts and therefore has deconsolidated these segregated accounts. This change had no impact to the net income or retained earnings of the Company. All significant intercompany accounts and transactions have been eliminated. Certain reclassifications and format changes have been made to prior years' amounts to conform to the 2017 presentation. Application of Recently Issued Accounting Standard Changes. Accounting for Share-Based Compensation. The following table presents certain financial statement line items as previously reported in 2016, the effect of those line items due to treating the cost of shares withheld upon settlement of share-based compensation awards as a financing activity with the Statements of Cash Flows and the line items as currently reported within the financial statements. Consolidated Statements of Cash Flows: Three Months Ended March 31, 2016 Effect of adoption of As previously new accounting reported policy As adopted (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Change in other assets and liabilities, net $ 3,844 $ 8,331 $ 12,175 Net cash provided by (used in) operating activities 367,145 8,331 375,476 CASH FLOWS FROM FINANCING ACTIVITIES: Cost of shares withheld for taxes on settlements of share-based compensation awards - (8,331 ) (8,331 ) Net cash provided by (used in) financing activities (134,469 ) (8,331 ) (142,800 ) Disclosures about Short-Duration Contracts. Disclosures for Investments in Certain Entities that Calculate Net Asset Value Per Share. Debt Issuance Costs. Consolidation.

Investments

Investments	3 Months Ended
	Mar. 31, 2017
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 March 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 $ 1,434,890 $ 19,729 $ (4,550 ) $ 1,450,069 $ - Obligations of U.S. states and political subdivisions 705,145 18,818 (11,526 ) 712,437 - Corporate securities 5,307,357 124,365 (28,769 ) 5,402,953 3,728 Asset-backed securities 556,928 1,225 (901 ) 557,252 - Mortgage-backed securities Commercial 299,824 2,167 (3,057 ) 298,934 - Agency residential 2,399,912 16,437 (26,172 ) 2,390,177 - Non-agency residential 598 43 (45 ) 596 - Foreign government securities 1,237,190 58,713 (53,139 ) 1,242,764 159 Foreign corporate securities 2,600,801 130,152 (55,140 ) 2,675,813 847 Total fixed maturity securities $ 14,542,645 $ 371,649 $ (183,299 ) $ 14,730,995 $ 4,734 Equity securities $ 108,834 $ 2,038 $ (6,526 ) $ 104,346 $ - At December 31, 2016 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,115,208 $ 20,410 $ (5,303 ) $ 1,130,315 $ - Obligations of U.S. states and political subdivisions 723,938 18,016 (11,970 ) 729,984 - Corporate securities 5,059,388 131,651 (35,758 ) 5,155,281 7,936 Asset-backed securities 488,824 1,110 (1,286 ) 488,648 - Mortgage-backed securities Commercial 308,827 1,983 (3,878 ) 306,932 - Agency residential 2,415,901 17,478 (27,910 ) 2,405,469 - Non-agency residential 642 44 (45 ) 641 - Foreign government securities 1,254,175 61,226 (57,241 ) 1,258,160 115 Foreign corporate securities 2,565,710 130,714 (64,446 ) 2,631,978 1,184 Total fixed maturity securities $ 13,932,613 $ 382,632 $ (207,837 ) $ 14,107,408 $ 9,235 Equity securities $ 129,553 $ 2,298 $ (12,784 ) $ 119,067 $ - (a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date The amortized cost and market value of fixed maturity securities are shown in the following table by contractual maturity. Mortgage-backed securities are generally more likely to be prepaid than other fixed maturity securities. As the stated maturity of such securities may not be indicative of actual maturities, the totals for mortgage-backed and asset-backed securities are shown separately. At March 31, 2017 At December 31, 2016 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,121,273 $ 1,129,238 $ 956,945 $ 966,970 Due after one year through five years 7,198,076 7,305,413 6,769,585 6,870,056 Due after five years through ten years 1,996,817 2,028,852 2,020,215 2,052,733 Due after ten years 969,217 1,020,533 971,674 1,015,959 Asset-backed securities 556,928 557,252 488,824 488,648 Mortgage-backed securities: Commercial 299,824 298,934 308,827 306,932 Agency residential 2,399,912 2,390,177 2,415,901 2,405,469 Non-agency residential 598 596 642 641 Total fixed maturity securities $ 14,542,645 $ 14,730,995 $ 13,932,613 $ 14,107,408 The changes in net unrealized appreciation (depreciation) for the Company's investments are derived from the following sources for the periods indicated: Three Months Ended March 31, (Dollars in thousands) 2017 2016 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 18,055 $ 200,308 Fixed maturity securities, other-than-temporary impairment (4,501 ) 210 Equity securities 5,999 4,366 Other invested assets 444 - Change in unrealized appreciation (depreciation), pre-tax 19,997 204,884 Deferred tax benefit (expense) (3,873 ) (29,472 ) Deferred tax benefit (expense), other-than-temporary impairment 1,225 (69 ) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ 17,349 $ 175,343 The Company frequently reviews all of its fixed maturity, available for sale securities for declines in market value and focuses its attention on securities whose fair value has fallen below 80 The Company's assessments are based on the issuers' current and expected future financial position, timeliness with respect to interest and/or principal payments, speed of repayments and any applicable credit enhancements or breakeven constant default rates on mortgage-backed and asset-backed securities, as well as relevant information provided by rating agencies, investment advisors and analysts. The majority of the Company's equity securities available for sale at market value are primarily comprised of mutual fund investments whose underlying securities consist of fixed maturity securities. When a fund's value reflects an unrealized loss, the Company assesses whether the decline in value is temporary or other-than-temporary. In making its assessment, the Company considers the composition of its portfolios and their related markets, reports received from the portfolio managers and discussions with portfolio managers. If the Company determines that the declines are temporary and it has the ability and intent to continue to hold the investments, then the declines are recorded as unrealized losses in accumulated other comprehensive income (loss). If declines are deemed to be other-than-temporary, then the carrying value of the investment is written down to fair value and recorded in net realized capital gains (losses) in the Company's consolidated statements of operations and comprehensive income (loss). Retrospective adjustments are employed to recalculate the values of asset-backed securities. All of the Company's asset-backed and mortgage-backed securities have a pass-through structure. Each acquisition lot is reviewed to recalculate the effective yield. The recalculated effective yield is used to derive a book value as if the new yield were applied at the time of acquisition. Outstanding principal factors from the time of acquisition to the adjustment date are used to calculate the prepayment history for all applicable securities. Conditional prepayment rates, computed with life to date factor histories and weighted average maturities, are used in the calculation of projected prepayments for pass-through security types. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at March 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 $ 403,943 $ (4,550 ) $ - $ - $ 403,943 $ (4,550 ) Obligations of U.S. states and political subdivisions 206,241 (10,966 ) 492 (560 ) 206,733 (11,526 ) Corporate securities 1,293,796 (19,093 ) 141,724 (9,676 ) 1,435,520 (28,769 ) Asset-backed securities 157,135 (467 ) 11,241 (434 ) 168,376 (901 ) Mortgage-backed securities Commercial 78,082 (1,899 ) 21,512 (1,158 ) 99,594 (3,057 ) Agency residential 1,611,271 (21,394 ) 179,414 (4,778 ) 1,790,685 (26,172 ) Non-agency residential - - 99 (45 ) 99 (45 ) Foreign government securities 279,924 (12,692 ) 247,576 (40,447 ) 527,500 (53,139 ) Foreign corporate securities 542,953 (9,280 ) 287,612 (45,860 ) 830,565 (55,140 ) Total fixed maturity securities $ 4,573,345 $ (80,341 ) $ 889,670 $ (102,958 ) $ 5,463,015 $ (183,299 ) Equity securities - - 90,810 (6,526 ) 90,810 (6,526 ) Total $ 4,573,345 $ (80,341 ) $ 980,480 $ (109,484 ) $ 5,553,825 $ (189,825 ) Duration of Unrealized Loss at March 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 $ 338,289 $ (1,311 ) $ 89,469 $ (21,621 ) $ 427,758 $ (22,932 ) Due in one year through five years 1,599,496 (22,510 ) 497,328 (67,024 ) 2,096,824 (89,534 ) Due in five years through ten years 546,075 (20,007 ) 84,641 (7,210 ) 630,716 (27,217 ) Due after ten years 242,997 (12,753 ) 5,966 (688 ) 248,963 (13,441 ) Asset-backed securities 157,135 (467 ) 11,241 (434 ) 168,376 (901 ) Mortgage-backed securities 1,689,353 (23,293 ) 201,025 (5,981 ) 1,890,378 (29,274 ) Total fixed maturity securities $ 4,573,345 $ (80,341 ) $ 889,670 $ (102,958 ) $ 5,463,015 $ (183,299 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at March 31, 2017 were $ 5,553,825 189,825 1.0 80,341 77,268 102,958 no The Company, given the size of its investment portfolio and capital position, does not have the intent to sell these securities; and it is more likely than not that the Company will not have to sell the securities before recovery of cost basis. In addition, all securities currently in an unrealized loss position are current with respect to principal and interest payments. The tables below display the aggregate market value and gross unrealized depreciation of fixed maturity and equity securities, by security type and contractual maturity, in each case subdivided according to length of time that individual securities had been in a continuous unrealized loss position for the periods indicated: Duration of Unrealized Loss at December 31, 2016 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 638,740 $ (5,303 ) $ - $ - $ 638,740 $ (5,303 ) Obligations of U.S. states and political subdivisions 221,088 (11,486 ) 564 (484 ) 221,652 (11,970 ) Corporate securities 1,360,743 (24,023 ) 177,153 (11,735 ) 1,537,896 (35,758 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities Commercial 143,554 (3,223 ) 7,184 (655 ) 150,738 (3,878 ) Agency residential 1,618,372 (22,461 ) 189,665 (5,449 ) 1,808,037 (27,910 ) Non-agency residential - - 113 (45 ) 113 (45 ) Foreign government securities 360,289 (12,041 ) 236,820 (45,200 ) 597,109 (57,241 ) Foreign corporate securities 687,599 (12,769 ) 295,500 (51,677 ) 983,099 (64,446 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) Equity securities - - 105,507 (12,784 ) 105,507 (12,784 ) Total $ 5,180,408 $ (91,871 ) $ 1,031,292 $ (128,750 ) $ 6,211,700 $ (220,621 ) Duration of Unrealized Loss at December 31, 2016 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 178,281 $ (1,122 ) $ 78,153 $ (14,318 ) $ 256,434 $ (15,440 ) Due in one year through five years 2,123,113 (26,263 ) 538,130 (84,803 ) 2,661,243 (111,066 ) Due in five years through ten years 680,334 (22,555 ) 86,631 (8,754 ) 766,965 (31,309 ) Due after ten years 286,731 (15,682 ) 7,123 (1,221 ) 293,854 (16,903 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities 1,761,926 (25,684 ) 196,962 (6,149 ) 1,958,888 (31,833 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) The aggregate market value and gross unrealized losses related to investments in an unrealized loss position at December 31, 2016 were $ 6,211,700 220,621 1.1 91,871 85,078 115,966 112,132 securities related to sub-prime and alt-A loans. In all instances, there were no projected cash flow shortfalls to recover the full book value of the investments and the related interest obligations. The mortgage-backed securities still have excess credit coverage and are current on interest and principal payments. The components of net investment income are presented in the table below for the periods indicated: Three Months Ended March 31, (Dollars in thousands) 2017 2016 Fixed maturities $ 103,245 $ 102,525 Equity securities 8,745 11,139 Short-term investments and cash 630 400 Other invested assets Limited partnerships 10,998 (6,158 ) Other 2,272 (850 ) Gross investment income before adjustments 125,890 107,056 Funds held interest income (expense) 3,148 2,540 Future policy benefit reserve income (expense) (319 ) (301 ) Gross investment income 128,719 109,295 Investment expenses (6,430 ) (6,771 ) Net investment income $ 122,289 $ 102,524 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 $ 535,550 The Company's other invested assets at March 31, 2017 and December 31, 2016 included $ 397,757 378,862 The components of net realized capital gains (losses) are presented in the table below for the periods indicated: Three Months Ended March 31, (Dollars in thousands) 2017 2016 Fixed maturity securities, market value: Other-than-temporary impairments $ (1,229 ) $ (28,793 ) Gains (losses) from sales 11,373 (16,911 ) Fixed maturity securities, fair value: Gains (losses) from fair value adjustments - (232 ) Equity securities, market value: Gains (losses) from sales (3,436 ) 57 Equity securities, fair value: Gains (losses) from sales 4,516 (8,426 ) Gains (losses) from fair value adjustments 41,507 (19,955 ) Other invested assets 1 - Short-term investments gain (loss) (4 ) 1 Total net realized capital gains (losses) $ 52,728 $ (74,259 ) 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 March 31, (Dollars in thousands) 2017 2016 Proceeds from sales of fixed maturity securities $ 428,491 $ 324,118 Gross gains from sales 15,473 8,552 Gross losses from sales (4,100 ) (25,463 ) Proceeds from sales of equity securities $ 159,117 $ 92,448 Gross gains from sales 8,208 1,839 Gross losses from sales (7,128 ) (10,208 )

Reserve For Losses, LAE And Fut

Reserve For Losses, LAE And Future Policy Benefit Reserve	3 Months Ended
	Mar. 31, 2017
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: Three Months Ended Twelve Months Ended March 31, December 31, (Dollars in thousands) 2017 2016 Gross reserves at January 1 $ 10,312,313 $ 9,951,798 Less reinsurance recoverables (990,862 ) (881,503 ) Net reserves at January 1 9,321,451 9,070,295 Incurred related to: Current year 770,660 3,434,964 Prior years 128 (295,335 ) Total incurred losses and LAE 770,788 3,139,629 Paid related to: Current year 106,606 745,642 Prior years 582,431 2,042,972 Total paid losses and LAE 689,037 2,788,614 Foreign exchange/translation adjustment 20,910 (99,859 ) Net reserves at December 31 9,424,112 9,321,451 Plus reinsurance recoverables 989,934 990,862 Gross reserves at December 31 $ 10,414,046 $ 10,312,313 Incurred prior years' reserves increased by $128 thousand and decreased by $295,335 thousand for the three months ended March 31, 2017 and for the twelve months ended December 31, 2016, respectively. The decrease for the twelve months ended December 31, 2016 was attributable to favorable development in the reinsurance segments of $ 468,749 53,909 60,000 16,720 43,280 173,414

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2017
Derivatives [Abstract]
Derivatives	5. DERIVATIVES The Company sold seven two The Company sold six 22,530 4 zero 3 448,887 2,362.72 no The Company sold one 6,706 22 zero 3 36,274 7,322.92 no At March 31, 2017 and December 31, 2016, the fair value for these equity put options was $ 19,429 22,059 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 March 31, 2017 December 31, 2016 Equity index put option contracts Equity index put option liability $ 19,429 $ 22,059 Total $ 19,429 $ 22,059 The change in fair value of the equity index put option contracts can be found in the Company's statement of operations and comprehensive income (loss) as follows: (Dollars in thousands) For the Three Months Ended Derivatives not designated as Location of gain (loss) in statements of March 31, hedging instruments operations and comprehensive income (loss) 2017 2016 Equity index put option contracts Net derivative gain (loss) $ 2,630 $ (3,020 ) Total $ 2,630 $ (3,020 )

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2017
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 forty-two private placement securities, the investment manager's valuation committee valued the forty-two 87,124 forty-two 86,536 The Company internally manages a public equity portfolio which had a fair value at March 31, 2017 and December 31, 2016 of $ 284,588 256,041 Equity securities denominated in U.S. currency with quoted prices in active markets for identical assets are categorized as level 1 since the quoted prices are directly observable. Equity securities traded on foreign exchanges are categorized as level 2 due to the added input of a foreign exchange conversion rate to determine fair or market value. The Company uses foreign currency exchange rates published by nationally recognized sources. All categories of fixed maturity securities listed in the tables below are generally categorized as level 2, since a particular security may not have traded but the pricing services are able to use valuation models with observable market inputs such as interest rate yield curves and prices for similar fixed maturity securities in terms of issuer, maturity and seniority. For foreign government securities and foreign corporate securities, the fair values provided by the third party pricing services in local currencies, and where applicable, are converted to U.S. dollars using currency exchange rates from nationally recognized sources. The fixed maturities with fair values categorized as level 3 result when prices are not available from the nationally recognized pricing services. The asset managers will then obtain non-binding price quotes for the securities from brokers. The single broker quotes are provided by market makers or broker-dealers who are recognized as market participants in the markets in which they are providing the quotes. The prices received from brokers are reviewed for reasonableness by the third party asset managers and the Company. If the broker quotes are for foreign denominated securities, the quotes are converted to U.S. dollars using currency exchange rates from nationally recognized sources. In limited circumstances when broker prices are not available for private placements, the Company will value the securities using comparable market information. 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 The Company's liability for equity index put options is categorized as level 3 since there is no active market for these seven long dated 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) March 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 $ 1,450,069 $ - $ 1,450,069 $ - Obligations of U.S. States and political subdivisions 712,437 - 712,437 - Corporate securities 5,402,953 - 5,318,631 84,322 Asset-backed securities 557,252 - 557,252 - Mortgage-backed securities Commercial 298,934 - 298,934 - Agency residential 2,390,177 - 2,390,177 - Non-agency residential 596 - 596 - Foreign government securities 1,242,764 - 1,242,764 - Foreign corporate securities 2,675,813 - 2,673,011 2,802 Total fixed maturities, market value 14,730,995 - 14,643,871 87,124 Equity securities, market value 104,346 90,809 13,537 - Equity securities, fair value 983,459 966,002 17,457 - Liabilities: Equity index put option contracts $ 19,429 $ - $ - $ 19,429 There were no The following table presents the fair value measurement levels for all assets and liabilities, which the Company has recorded at fair value (fair and market value) as of the periods indicated: Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2016 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,130,315 $ - $ 1,130,315 $ - Obligations of U.S. States and political subdivisions 729,984 - 729,984 - Corporate securities 5,155,281 - 5,090,084 65,197 Asset-backed securities 488,648 - 488,648 - Mortgage-backed securities Commercial 306,932 - 306,932 - Agency residential 2,405,469 - 2,405,469 - Non-agency residential 641 - 641 - Foreign government securities 1,258,160 - 1,258,160 - Foreign corporate securities 2,631,978 - 2,629,440 2,538 Total fixed maturities, market value 14,107,408 - 14,039,673 67,735 Equity securities, market value 119,067 105,507 13,560 - Equity securities, fair value 1,010,085 949,523 60,562 - Liabilities: Equity index put option contracts $ 22,059 $ - $ - $ 22,059 In addition, $ 22,118 18,801 The following tables present the activity under Level 3, fair value measurements using significant unobservable inputs by asset type, for the periods indicated: Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance $ 65,197 $ 2,538 $ 67,735 $ 3,933 $ 1,593 $ 5,526 Total gains or (losses) (realized/unrealized) Included in earnings 214 (24 ) 190 8 (997 ) (989 ) Included in other comprehensive income (loss) (29 ) - (29 ) (6 ) - (6 ) Purchases, issuances and settlements 18,940 288 19,228 11,771 - 11,771 Transfers in and/or (out) of Level 3 - - - - - - Ending balance $ 84,322 $ 2,802 $ 87,124 $ 15,706 $ 596 $ 16,302 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 $ - $ - $ - $ - $ (997 ) $ (997 ) (Some amounts may not reconcile due to rounding.) 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 March 31, (Dollars in thousands) 2017 2016 Liabilities: Balance, beginning of period $ 22,059 $ 40,705 Total (gains) or losses (realized/unrealized) Included in earnings (2,630 ) 3,020 Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 19,429 $ 43,725 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	3 Months Ended
	Mar. 31, 2017
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 March 31, (Dollars in thousands, except per share amounts) 2017 2016 Net income (loss) per share: Numerator Net income (loss) $ 291,643 $ 171,686 Less: dividends declared-common shares and nonvested common shares (51,281 ) (48,706 ) Undistributed earnings 240,362 122,980 Percentage allocated to common shareholders (1) 98.9 % 99.0 % 237,754 121,697 Add: dividends declared-common shareholders 50,753 48,210 Numerator for basic and diluted earnings per common share $ 288,507 $ 169,907 Denominator Denominator for basic earnings per weighted-average common shares 40,529 42,129 Effect of dilutive securities: Options 267 334 Denominator for diluted earnings per adjusted weighted-average common shares 40,796 42,463 Per common share net income (loss) Basic $ 7.12 $ 4.03 Diluted $ 7.07 $ 4.00 (1) Basic weighted-average common shares outstanding 40,529 42,129 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,973 42,573 Percentage allocated to common shareholders 98.9 % 99.0 % (Some amounts may not reconcile due to rounding.) There were no All outstanding options expire on or between February 20, 2018 and September 19, 2022.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments And Contingencies [Abstract]
Commitments And Contingencies	8. COMMITMENTS AND CONTINGENCIES In the ordinary course of business, the Company is involved in lawsuits, arbitrations and other formal and informal dispute resolution procedures, the outcomes of which will determine the Company's rights and obligations under insurance and reinsurance agreements. In some disputes, the Company seeks to enforce its rights under an agreement or to collect funds owing to it. In other matters, the Company is resisting attempts by others to collect funds or enforce alleged rights. These disputes arise from time to time and are ultimately resolved through both informal and formal means, including negotiated resolution, arbitration and litigation. In all such matters, the Company believes that its positions are legally and commercially reasonable. The Company considers the statuses of these proceedings when determining its reserves for unpaid loss and loss adjustment expenses. Aside from litigation and arbitrations related to these insurance and reinsurance agreements, the Company is not a party to any other material litigation or arbitration. The Company has entered into separate annuity agreements with The Prudential Insurance of America ("The Prudential") and an additional unaffiliated life insurance company in which the Company has either purchased annuity contracts or become the assignee of annuity proceeds that are meant to settle claim payment obligations in the future. In both instances, the Company would become contingently liable if either The Prudential or the unaffiliated life insurance company were unable to make payments related to the respective annuity contract. The table below presents the estimated cost to replace all such annuities for which the Company was contingently liable for the periods indicated: At March 31, At December 31, (Dollars in thousands) 2017 2016 The Prudential $ 146,620 $ 146,507 Unaffiliated life insurance company 32,458 33,860

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2017
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	9. OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the components of comprehensive income (loss) in the consolidated statements of operations for the periods indicated: Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (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 $ 31,206 $ (8,382 ) $ 22,824 $ 159,028 $ (16,207 ) $ 142,821 URA(D) on securities - OTTI (4,501 ) 1,225 (3,276 ) 210 (69 ) 141 Reclassification of net realized losses (gains) included in net income (loss) (6,708 ) 4,509 (2,199 ) 45,646 (13,265 ) 32,381 Foreign currency translation adjustments 13,813 (1,920 ) 11,893 17,819 (8,046 ) 9,773 Benefit plan actuarial net gain (loss) - - - - - - Reclassification of benefit plan liability amortization included in net income (loss) 3,083 (1,079 ) 2,004 2,062 (722 ) 1,340 Total other comprehensive income (loss) $ 36,893 $ (5,647 ) $ 31,246 $ 224,765 $ (38,309 ) $ 186,456 The following table presents details of the amounts reclassified from AOCI for the periods indicated: Three Months Ended March 31, Affected line item within the statements of AOCI component 2017 2016 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ (6,708 ) $ 45,646 Other net realized capital gains (losses) 4,509 (13,265 ) Income tax expense (benefit) $ (2,199 ) $ 32,381 Net income (loss) Benefit plan net gain (loss) $ 3,083 $ 2,062 Other underwriting expenses (1,079 ) (722 ) Income tax expense (benefit) $ 2,004 $ 1,340 Net income (loss) The following table presents the components of accumulated other comprehensive income (loss), net of tax, in the consolidated balance sheets for the periods indicated: Three Months Ended Twelve Months Ended March 31, December 31, (Dollars in thousands) 2017 2016 Beginning balance of URA (D) on securities $ 115,558 $ 42,811 Current period change in URA (D) of investments - temporary 20,625 66,802 Current period change in URA (D) of investments - non-credit OTTI (3,276 ) 5,945 Ending balance of URA (D) on securities 132,907 115,558 Beginning balance of foreign currency translation adjustments (266,818 ) (211,477 ) Current period change in foreign currency translation adjustments 11,893 (55,341 ) Ending balance of foreign currency translation adjustments (254,925 ) (266,818 ) Beginning balance of benefit plan net gain (loss) (65,504 ) (63,089 ) Current period change in benefit plan net gain (loss) 2,004 (2,415 ) Ending balance of benefit plan net gain (loss) (63,500 ) (65,504 ) Ending balance of accumulated other comprehensive income (loss) $ (185,518 ) $ (216,764 )

Credit Facilities

Credit Facilities	3 Months Ended
	Mar. 31, 2017
Credit Facilities [Abstract]
Credit Facilities	10. CREDIT FACILITIES The Company has two 1,000,000 Three Months Ended March 31, (Dollars in thousands) 2017 2016 Credit facility interest and fees incurred $ 104 $ 370 The terms and outstanding amounts for each facility are discussed below: Group Credit Facility Effective May 26, 2016, Group, Everest Reinsurance (Bermuda), Ltd. ("Bermuda Re") and Everest International Reinsurance, Ltd. ("Everest International"), both direct subsidiaries of Group, entered into a five year, $ 800,000 800,000 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 5,657,511 (Dollars in thousands) At March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 - 600,000 - - 471,285 12/31/2017 - 478,233 12/31/2017 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 471,285 $ 800,000 $ 478,233 Bermuda Re Letter of Credit Facility Effective December 30, 2016, Bermuda Re renewed its letter of credit issuance facility with Citibank N.A. referred to as the "Bermuda Re Letter of Credit Facility", which commitment is reconfirmed annually with updated fees. The current renewal of the Bermuda Re Letter of Credit Facility provides for the issuance of up to $ 200,000 0.35 0.45 60 0.15 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 3,672 11/24/2017 $ 200,000 $ 4,058 2/28/2017 74,702 12/31/2017 3,672 11/24/2017 4,058 2/28/2018 69,404 12/31/2017 281 8/30/2018 269 8/30/2018 3,788 12/31/2018 1,163 12/31/2018 92,803 3/20/2021 93,180 12/30/2020 Total Citibank Bilateral Agreement $ 200,000 $ 179,304 $ 200,000 $ 171,746 Everest International Credit Facility Effective November 9, 2016, Everest International renewed its credit facility with Lloyd's of London Bank ("Everest International Credit Facility"). The current renewal of the Everest International Credit Facility has a four 140,000 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 5,657,511 The following table summarizes the outstanding letters of credit for the periods indicated: (Dollars in thousands) At March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 140,000 £ 130,606 12/31/2020 £ 140,000 £ 130,606 12/31/2019 - - - - Total Lloyd's Bank Credit Facility £ 140,000 £ 130,606 £ 140,000 £ 130,606

Collateralized Reinsurance And

Collateralized Reinsurance And Trust Agreements	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017, the total amount on deposit in trust accounts was $ 747,944 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 March 31, Mt. Logan Re Segregated Accounts 2017 2016 (Dollars in thousands) Ceded written premiums 54,218 56,668 Ceded earned premiums 40,597 42,904 Ceded losses and LAE 19,585 10,761 Assumed written premiums 2,732 3,560 Assumed earned premiums 2,732 3,560 Assumed losses and LAE - - Each segregated account is permitted to assume net risk exposures equal to its amount of preferred shares and posted collateral, which in the aggregate was $ 868,836 932,243 55,850 55,536 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 Re 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 225,000 400,000 325,000 Kilimanjaro has financed the various property catastrophe reinsurance coverages by issuing catastrophe bonds to unrelated, external investors. On April 24, 2014, Kilimanjaro issued $ 450,000 500,000 625,000 950,000 300,000

Senior Notes

Senior Notes	3 Months Ended
	Mar. 31, 2017
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. March 31, 2017 December 31, 2016 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,744 $ 403,468 $ 396,714 $ 383,612 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 March 31, (Dollars in thousands) 2017 2016 Interest expense incurred $ 4,868 $ 4,868

Long Term Subordinated Notes

Long Term Subordinated Notes	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 December 31, 2016 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,487 $ 222,456 $ 236,462 $ 204,636 During the fixed rate interest period from May 3, 2007 May 14, 2017 6.6 November 15, 2007 Holdings can redeem the long term subordinated notes prior to May 15, 2017, in whole but not in part at the applicable redemption price, which will equal the greater of (a) 100 0.25 0.50 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 March 31, (Dollars in thousands) 2017 2016 Interest expense incurred $ 3,937 $ 3,937

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2017
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. and Canada. 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 U.S. Reinsurance March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 578,958 $ 536,706 Net written premiums 517,369 470,691 Premiums earned $ 481,524 $ 486,541 Incurred losses and LAE 262,066 236,444 Commission and brokerage 102,358 117,317 Other underwriting expenses 14,251 13,459 Underwriting gain (loss) $ 102,849 $ 119,321 Three Months Ended International March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 266,417 $ 235,591 Net written premiums 245,662 202,500 Premiums earned $ 271,581 $ 250,450 Incurred losses and LAE 159,501 147,535 Commission and brokerage 66,150 64,286 Other underwriting expenses 9,480 7,823 Underwriting gain (loss) $ 36,450 $ 30,806 Three Months Ended Bermuda March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 321,122 $ 204,732 Net written premiums 305,032 184,314 Premiums earned $ 235,106 $ 194,428 Incurred losses and LAE 128,432 111,521 Commission and brokerage 58,423 49,922 Other underwriting expenses 9,480 9,185 Underwriting gain (loss) $ 38,771 $ 23,800 Three Months Ended Insurance March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 434,447 $ 376,160 Net written premiums 345,751 323,952 Premiums earned $ 323,886 $ 287,448 Incurred losses and LAE 220,789 205,249 Commission and brokerage 55,338 43,481 Other underwriting expenses 42,676 41,643 Underwriting gain (loss) $ 5,083 $ (2,925 ) 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 March 31, (Dollars in thousands) 2017 2016 Underwriting gain (loss) $ 183,153 $ 171,002 Net investment income 122,289 102,524 Net realized capital gains (losses) 52,728 (74,259 ) Net derivative gain (loss) 2,630 (3,020 ) Corporate expenses (8,457 ) (7,886 ) Interest, fee and bond issue cost amortization expense (8,964 ) (9,228 ) Other income (expense) (4,966 ) (2,066 ) Income (loss) before taxes $ 338,413 $ 177,067 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 March 31, (Dollars in thousands) 2017 2016 United Kingdom gross written premium $ 170,820 $ 182,630 No other country represented more than 5

Share-Based Compensation Plans

Share-Based Compensation Plans	3 Months Ended
	Mar. 31, 2017
Share-Based Compensation Plans [Abstract]
Share-Based Compensation Plans	15. SHARE-BASED COMPENSATION PLANS For the three months ended March 31, 2017, share-based compensation awards granted were 151,300 February 22, 2017 234.03 11,245 February 22 2017 234.03

Retirement Benefits

Retirement Benefits	3 Months Ended
	Mar. 31, 2017
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 March 31, (Dollars in thousands) 2017 2016 Service cost $ 3,299 $ 2,897 Interest cost 2,276 2,361 Expected return on plan assets (3,155 ) (2,484 ) Amortization of net (income) loss 3,040 2,014 Net periodic benefit cost $ 5,460 $ 4,788 Other Benefits Three Months Ended March 31, (Dollars in thousands) 2017 2016 Service cost $ 440 $ 438 Interest cost 249 296 Amortization of prior service cost (33 ) - Amortization of net (income) loss 76 48 Net periodic benefit cost $ 732 $ 782 The Company did not make any contributions to the qualified pension benefit plan for the three

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
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. Pre-tax income generated by Group's non-Bermuda subsidiaries and the UK branch of Bermuda is subject to applicable federal, foreign, state and local taxes on corporations. Company subsidiaries domiciled in the US as well as the Canadian and Singapore branches of Everest Re generate US pre-tax income (loss). Foreign domiciled subsidiaries, including the UK branch of Bermuda Re, generate non-US pre-tax income (loss). Fluctuations in US and non-US pre-tax income (loss) primarily result from the impact of catastrophe losses and realized investment gains (losses). For interim reporting periods, the company is generally required to use the annualized effective tax rate ("AETR") method, as prescribed by ASC 740-270, Interim Reporting, to calculate its income tax provision. Under this method, the AETR is applied to the interim year-to-date pre-tax income to determine the income tax expense or benefit for the year-to-date period. The income tax expense or benefit for a quarter represents the difference between the year-to-date income 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 and AETR.

Dispositions

Dispositions	3 Months Ended
	Mar. 31, 2017
Dispositions [Abstract]
Dispositions	18. DISPOSITION On August 24, 2016, the Company sold Heartland, its crop Managing General Agent to CGB for $ 49,000 12,942

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	19. SUBSEQUENT EVENTS On April 13, 2017, the Company entered into six 950,000 300,000

Basis Of Presentation (Tables)

Basis Of Presentation (Tables)	3 Months Ended
	Mar. 31, 2017
Basis Of Presentation[Abstract]
Schedule of Effect of Newly Adopted Accounting Policies, Cash Flow	Consolidated Statements of Cash Flows: Three Months Ended March 31, 2016 Effect of adoption of As previously new accounting reported policy As adopted (Dollars in thousands) CASH FLOWS FROM OPERATING ACTIVITIES: Change in other assets and liabilities, net $ 3,844 $ 8,331 $ 12,175 Net cash provided by (used in) operating activities 367,145 8,331 375,476 CASH FLOWS FROM FINANCING ACTIVITIES: Cost of shares withheld for taxes on settlements of share-based compensation awards - (8,331 ) (8,331 ) Net cash provided by (used in) financing activities (134,469 ) (8,331 ) (142,800 )

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2017
Investments [Abstract]
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments	At March 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 $ 1,434,890 $ 19,729 $ (4,550 ) $ 1,450,069 $ - Obligations of U.S. states and political subdivisions 705,145 18,818 (11,526 ) 712,437 - Corporate securities 5,307,357 124,365 (28,769 ) 5,402,953 3,728 Asset-backed securities 556,928 1,225 (901 ) 557,252 - Mortgage-backed securities Commercial 299,824 2,167 (3,057 ) 298,934 - Agency residential 2,399,912 16,437 (26,172 ) 2,390,177 - Non-agency residential 598 43 (45 ) 596 - Foreign government securities 1,237,190 58,713 (53,139 ) 1,242,764 159 Foreign corporate securities 2,600,801 130,152 (55,140 ) 2,675,813 847 Total fixed maturity securities $ 14,542,645 $ 371,649 $ (183,299 ) $ 14,730,995 $ 4,734 Equity securities $ 108,834 $ 2,038 $ (6,526 ) $ 104,346 $ - At December 31, 2016 Amortized Unrealized Unrealized Market OTTI in AOCI (Dollars in thousands) Cost Appreciation Depreciation Value (a) Fixed maturity securities U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,115,208 $ 20,410 $ (5,303 ) $ 1,130,315 $ - Obligations of U.S. states and political subdivisions 723,938 18,016 (11,970 ) 729,984 - Corporate securities 5,059,388 131,651 (35,758 ) 5,155,281 7,936 Asset-backed securities 488,824 1,110 (1,286 ) 488,648 - Mortgage-backed securities Commercial 308,827 1,983 (3,878 ) 306,932 - Agency residential 2,415,901 17,478 (27,910 ) 2,405,469 - Non-agency residential 642 44 (45 ) 641 - Foreign government securities 1,254,175 61,226 (57,241 ) 1,258,160 115 Foreign corporate securities 2,565,710 130,714 (64,446 ) 2,631,978 1,184 Total fixed maturity securities $ 13,932,613 $ 382,632 $ (207,837 ) $ 14,107,408 $ 9,235 Equity securities $ 129,553 $ 2,298 $ (12,784 ) $ 119,067 $ - (a)
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity	At March 31, 2017 At December 31, 2016 Amortized Market Amortized Market (Dollars in thousands) Cost Value Cost Value Fixed maturity securities – available for sale: Due in one year or less $ 1,121,273 $ 1,129,238 $ 956,945 $ 966,970 Due after one year through five years 7,198,076 7,305,413 6,769,585 6,870,056 Due after five years through ten years 1,996,817 2,028,852 2,020,215 2,052,733 Due after ten years 969,217 1,020,533 971,674 1,015,959 Asset-backed securities 556,928 557,252 488,824 488,648 Mortgage-backed securities: Commercial 299,824 298,934 308,827 306,932 Agency residential 2,399,912 2,390,177 2,415,901 2,405,469 Non-agency residential 598 596 642 641 Total fixed maturity securities $ 14,542,645 $ 14,730,995 $ 13,932,613 $ 14,107,408
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Increase (decrease) during the period between the market value and cost of investments carried at market value, and deferred taxes thereon: Fixed maturity securities $ 18,055 $ 200,308 Fixed maturity securities, other-than-temporary impairment (4,501 ) 210 Equity securities 5,999 4,366 Other invested assets 444 - Change in unrealized appreciation (depreciation), pre-tax 19,997 204,884 Deferred tax benefit (expense) (3,873 ) (29,472 ) Deferred tax benefit (expense), other-than-temporary impairment 1,225 (69 ) Change in unrealized appreciation (depreciation), net of deferred taxes, included in shareholders' equity $ 17,349 $ 175,343
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type	Duration of Unrealized Loss at March 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 $ 403,943 $ (4,550 ) $ - $ - $ 403,943 $ (4,550 ) Obligations of U.S. states and political subdivisions 206,241 (10,966 ) 492 (560 ) 206,733 (11,526 ) Corporate securities 1,293,796 (19,093 ) 141,724 (9,676 ) 1,435,520 (28,769 ) Asset-backed securities 157,135 (467 ) 11,241 (434 ) 168,376 (901 ) Mortgage-backed securities Commercial 78,082 (1,899 ) 21,512 (1,158 ) 99,594 (3,057 ) Agency residential 1,611,271 (21,394 ) 179,414 (4,778 ) 1,790,685 (26,172 ) Non-agency residential - - 99 (45 ) 99 (45 ) Foreign government securities 279,924 (12,692 ) 247,576 (40,447 ) 527,500 (53,139 ) Foreign corporate securities 542,953 (9,280 ) 287,612 (45,860 ) 830,565 (55,140 ) Total fixed maturity securities $ 4,573,345 $ (80,341 ) $ 889,670 $ (102,958 ) $ 5,463,015 $ (183,299 ) Equity securities - - 90,810 (6,526 ) 90,810 (6,526 ) Total $ 4,573,345 $ (80,341 ) $ 980,480 $ (109,484 ) $ 5,553,825 $ (189,825 ) Duration of Unrealized Loss at December 31, 2016 By Security Type Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities - available for sale U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 638,740 $ (5,303 ) $ - $ - $ 638,740 $ (5,303 ) Obligations of U.S. states and political subdivisions 221,088 (11,486 ) 564 (484 ) 221,652 (11,970 ) Corporate securities 1,360,743 (24,023 ) 177,153 (11,735 ) 1,537,896 (35,758 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities Commercial 143,554 (3,223 ) 7,184 (655 ) 150,738 (3,878 ) Agency residential 1,618,372 (22,461 ) 189,665 (5,449 ) 1,808,037 (27,910 ) Non-agency residential - - 113 (45 ) 113 (45 ) Foreign government securities 360,289 (12,041 ) 236,820 (45,200 ) 597,109 (57,241 ) Foreign corporate securities 687,599 (12,769 ) 295,500 (51,677 ) 983,099 (64,446 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 ) Equity securities - - 105,507 (12,784 ) 105,507 (12,784 ) Total $ 5,180,408 $ (91,871 ) $ 1,031,292 $ (128,750 ) $ 6,211,700 $ (220,621 )
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity	Duration of Unrealized Loss at March 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 $ 338,289 $ (1,311 ) $ 89,469 $ (21,621 ) $ 427,758 $ (22,932 ) Due in one year through five years 1,599,496 (22,510 ) 497,328 (67,024 ) 2,096,824 (89,534 ) Due in five years through ten years 546,075 (20,007 ) 84,641 (7,210 ) 630,716 (27,217 ) Due after ten years 242,997 (12,753 ) 5,966 (688 ) 248,963 (13,441 ) Asset-backed securities 157,135 (467 ) 11,241 (434 ) 168,376 (901 ) Mortgage-backed securities 1,689,353 (23,293 ) 201,025 (5,981 ) 1,890,378 (29,274 ) Total fixed maturity securities $ 4,573,345 $ (80,341 ) $ 889,670 $ (102,958 ) $ 5,463,015 $ (183,299 ) Duration of Unrealized Loss at December 31, 2016 By Maturity Less than 12 months Greater than 12 months Total Gross Gross Gross Unrealized Unrealized Unrealized (Dollars in thousands) Market Value Depreciation Market Value Depreciation Market Value Depreciation Fixed maturity securities Due in one year or less $ 178,281 $ (1,122 ) $ 78,153 $ (14,318 ) $ 256,434 $ (15,440 ) Due in one year through five years 2,123,113 (26,263 ) 538,130 (84,803 ) 2,661,243 (111,066 ) Due in five years through ten years 680,334 (22,555 ) 86,631 (8,754 ) 766,965 (31,309 ) Due after ten years 286,731 (15,682 ) 7,123 (1,221 ) 293,854 (16,903 ) Asset-backed securities 150,023 (565 ) 18,786 (721 ) 168,809 (1,286 ) Mortgage-backed securities 1,761,926 (25,684 ) 196,962 (6,149 ) 1,958,888 (31,833 ) Total fixed maturity securities $ 5,180,408 $ (91,871 ) $ 925,785 $ (115,966 ) $ 6,106,193 $ (207,837 )
Summary Of Components Of Net Investment Income	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Fixed maturities $ 103,245 $ 102,525 Equity securities 8,745 11,139 Short-term investments and cash 630 400 Other invested assets Limited partnerships 10,998 (6,158 ) Other 2,272 (850 ) Gross investment income before adjustments 125,890 107,056 Funds held interest income (expense) 3,148 2,540 Future policy benefit reserve income (expense) (319 ) (301 ) Gross investment income 128,719 109,295 Investment expenses (6,430 ) (6,771 ) Net investment income $ 122,289 $ 102,524
Summary Of Components Of Net Realized Capital Gains (Losses)	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Fixed maturity securities, market value: Other-than-temporary impairments $ (1,229 ) $ (28,793 ) Gains (losses) from sales 11,373 (16,911 ) Fixed maturity securities, fair value: Gains (losses) from fair value adjustments - (232 ) Equity securities, market value: Gains (losses) from sales (3,436 ) 57 Equity securities, fair value: Gains (losses) from sales 4,516 (8,426 ) Gains (losses) from fair value adjustments 41,507 (19,955 ) Other invested assets 1 - Short-term investments gain (loss) (4 ) 1 Total net realized capital gains (losses) $ 52,728 $ (74,259 )
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Proceeds from sales of fixed maturity securities $ 428,491 $ 324,118 Gross gains from sales 15,473 8,552 Gross losses from sales (4,100 ) (25,463 ) Proceeds from sales of equity securities $ 159,117 $ 92,448 Gross gains from sales 8,208 1,839 Gross losses from sales (7,128 ) (10,208 )

Reserve For Losses, LAE And F29

Reserve For Losses, LAE And Future Policy Benefit Reserve (Tables)	3 Months Ended
	Mar. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Summary Of Activity In The Reserve For Losses And LAE	Three Months Ended Twelve Months Ended March 31, December 31, (Dollars in thousands) 2017 2016 Gross reserves at January 1 $ 10,312,313 $ 9,951,798 Less reinsurance recoverables (990,862 ) (881,503 ) Net reserves at January 1 9,321,451 9,070,295 Incurred related to: Current year 770,660 3,434,964 Prior years 128 (295,335 ) Total incurred losses and LAE 770,788 3,139,629 Paid related to: Current year 106,606 745,642 Prior years 582,431 2,042,972 Total paid losses and LAE 689,037 2,788,614 Foreign exchange/translation adjustment 20,910 (99,859 ) Net reserves at December 31 9,424,112 9,321,451 Plus reinsurance recoverables 989,934 990,862 Gross reserves at December 31 $ 10,414,046 $ 10,312,313

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 December 31, 2016 Equity index put option contracts Equity index put option liability $ 19,429 $ 22,059 Total $ 19,429 $ 22,059 (Dollars in thousands) For the Three Months Ended Derivatives not designated as Location of gain (loss) in statements of March 31, hedging instruments operations and comprehensive income (loss) 2017 2016 Equity index put option contracts Net derivative gain (loss) $ 2,630 $ (3,020 ) Total $ 2,630 $ (3,020 )

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value [Abstract]
Fair Value Measurement Levels For All Assets And Liabilities	Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) March 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 $ 1,450,069 $ - $ 1,450,069 $ - Obligations of U.S. States and political subdivisions 712,437 - 712,437 - Corporate securities 5,402,953 - 5,318,631 84,322 Asset-backed securities 557,252 - 557,252 - Mortgage-backed securities Commercial 298,934 - 298,934 - Agency residential 2,390,177 - 2,390,177 - Non-agency residential 596 - 596 - Foreign government securities 1,242,764 - 1,242,764 - Foreign corporate securities 2,675,813 - 2,673,011 2,802 Total fixed maturities, market value 14,730,995 - 14,643,871 87,124 Equity securities, market value 104,346 90,809 13,537 - Equity securities, fair value 983,459 966,002 17,457 - Liabilities: Equity index put option contracts $ 19,429 $ - $ - $ 19,429 Fair Value Measurement Using: Quoted Prices in Active Significant Markets for Other Significant Identical Observable Unobservable Assets Inputs Inputs (Dollars in thousands) December 31, 2016 (Level 1) (Level 2) (Level 3) Assets: Fixed maturities, market value U.S. Treasury securities and obligations of U.S. government agencies and corporations $ 1,130,315 $ - $ 1,130,315 $ - Obligations of U.S. States and political subdivisions 729,984 - 729,984 - Corporate securities 5,155,281 - 5,090,084 65,197 Asset-backed securities 488,648 - 488,648 - Mortgage-backed securities Commercial 306,932 - 306,932 - Agency residential 2,405,469 - 2,405,469 - Non-agency residential 641 - 641 - Foreign government securities 1,258,160 - 1,258,160 - Foreign corporate securities 2,631,978 - 2,629,440 2,538 Total fixed maturities, market value 14,107,408 - 14,039,673 67,735 Equity securities, market value 119,067 105,507 13,560 - Equity securities, fair value 1,010,085 949,523 60,562 - Liabilities: Equity index put option contracts $ 22,059 $ - $ - $ 22,059
Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type	Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 Corporate Foreign Corporate Foreign (Dollars in thousands) Securities Corporate Total Securities Corporate Total Beginning balance $ 65,197 $ 2,538 $ 67,735 $ 3,933 $ 1,593 $ 5,526 Total gains or (losses) (realized/unrealized) Included in earnings 214 (24 ) 190 8 (997 ) (989 ) Included in other comprehensive income (loss) (29 ) - (29 ) (6 ) - (6 ) Purchases, issuances and settlements 18,940 288 19,228 11,771 - 11,771 Transfers in and/or (out) of Level 3 - - - - - - Ending balance $ 84,322 $ 2,802 $ 87,124 $ 15,706 $ 596 $ 16,302 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 $ - $ - $ - $ - $ (997 ) $ (997 ) (Some amounts may not reconcile due to rounding.)
Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Liabilities: Balance, beginning of period $ 22,059 $ 40,705 Total (gains) or losses (realized/unrealized) Included in earnings (2,630 ) 3,020 Included in other comprehensive income (loss) - - Purchases, issuances and settlements - - Transfers in and/or (out) of Level 3 - - Balance, end of period $ 19,429 $ 43,725 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)	3 Months Ended
	Mar. 31, 2017
Earnings Per Common Share [Abstract]
Schedule Of Net Income (Loss) Per Common Share	Three Months Ended March 31, (Dollars in thousands, except per share amounts) 2017 2016 Net income (loss) per share: Numerator Net income (loss) $ 291,643 $ 171,686 Less: dividends declared-common shares and nonvested common shares (51,281 ) (48,706 ) Undistributed earnings 240,362 122,980 Percentage allocated to common shareholders (1) 98.9 % 99.0 % 237,754 121,697 Add: dividends declared-common shareholders 50,753 48,210 Numerator for basic and diluted earnings per common share $ 288,507 $ 169,907 Denominator Denominator for basic earnings per weighted-average common shares 40,529 42,129 Effect of dilutive securities: Options 267 334 Denominator for diluted earnings per adjusted weighted-average common shares 40,796 42,463 Per common share net income (loss) Basic $ 7.12 $ 4.03 Diluted $ 7.07 $ 4.00 (1) Basic weighted-average common shares outstanding 40,529 42,129 Basic weighted-average common shares outstanding and nonvested common shares expected to vest 40,973 42,573 Percentage allocated to common shareholders 98.9 % 99.0 % (Some amounts may not reconcile due to rounding.)

Commitments And Contingencies (

Commitments And Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments And Contingencies [Abstract]
Summary Of Estimated Cost To Replace Annuities For Contingent Liability	At March 31, At December 31, (Dollars in thousands) 2017 2016 The Prudential $ 146,620 $ 146,507 Unaffiliated life insurance company 32,458 33,860

Other Comprehensive Income (L34

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Other Comprehensive Income (Loss) [Abstract]
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations	Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (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 $ 31,206 $ (8,382 ) $ 22,824 $ 159,028 $ (16,207 ) $ 142,821 URA(D) on securities - OTTI (4,501 ) 1,225 (3,276 ) 210 (69 ) 141 Reclassification of net realized losses (gains) included in net income (loss) (6,708 ) 4,509 (2,199 ) 45,646 (13,265 ) 32,381 Foreign currency translation adjustments 13,813 (1,920 ) 11,893 17,819 (8,046 ) 9,773 Benefit plan actuarial net gain (loss) - - - - - - Reclassification of benefit plan liability amortization included in net income (loss) 3,083 (1,079 ) 2,004 2,062 (722 ) 1,340 Total other comprehensive income (loss) $ 36,893 $ (5,647 ) $ 31,246 $ 224,765 $ (38,309 ) $ 186,456
Reclassification From Accumulated Other Comprehensive Income	Three Months Ended March 31, Affected line item within the statements of AOCI component 2017 2016 operations and comprehensive income (loss) (Dollars in thousands) URA(D) on securities $ (6,708 ) $ 45,646 Other net realized capital gains (losses) 4,509 (13,265 ) Income tax expense (benefit) $ (2,199 ) $ 32,381 Net income (loss) Benefit plan net gain (loss) $ 3,083 $ 2,062 Other underwriting expenses (1,079 ) (722 ) Income tax expense (benefit) $ 2,004 $ 1,340 Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets	Three Months Ended Twelve Months Ended March 31, December 31, (Dollars in thousands) 2017 2016 Beginning balance of URA (D) on securities $ 115,558 $ 42,811 Current period change in URA (D) of investments - temporary 20,625 66,802 Current period change in URA (D) of investments - non-credit OTTI (3,276 ) 5,945 Ending balance of URA (D) on securities 132,907 115,558 Beginning balance of foreign currency translation adjustments (266,818 ) (211,477 ) Current period change in foreign currency translation adjustments 11,893 (55,341 ) Ending balance of foreign currency translation adjustments (254,925 ) (266,818 ) Beginning balance of benefit plan net gain (loss) (65,504 ) (63,089 ) Current period change in benefit plan net gain (loss) 2,004 (2,415 ) Ending balance of benefit plan net gain (loss) (63,500 ) (65,504 ) Ending balance of accumulated other comprehensive income (loss) $ (185,518 ) $ (216,764 )

Credit Facilities (Tables)

Credit Facilities (Tables)	3 Months Ended
	Mar. 31, 2017
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Credit facility interest and fees incurred $ 104 $ 370
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 March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ - $ 200,000 $ - Tranche Two 600,000 - 600,000 - - 471,285 12/31/2017 - 478,233 12/31/2017 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 471,285 $ 800,000 $ 478,233
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 3,672 11/24/2017 $ 200,000 $ 4,058 2/28/2017 74,702 12/31/2017 3,672 11/24/2017 4,058 2/28/2018 69,404 12/31/2017 281 8/30/2018 269 8/30/2018 3,788 12/31/2018 1,163 12/31/2018 92,803 3/20/2021 93,180 12/30/2020 Total Citibank Bilateral Agreement $ 200,000 $ 179,304 $ 200,000 $ 171,746
Lloyd's of London Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At March 31, 2017 At December 31, 2016 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 140,000 £ 130,606 12/31/2020 £ 140,000 £ 130,606 12/31/2019 - - - - Total Lloyd's Bank Credit Facility £ 140,000 £ 130,606 £ 140,000 £ 130,606

Collateralized Reinsurance An36

Collateralized Reinsurance And Trust Agreements (Tables)	3 Months Ended
	Mar. 31, 2017
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Three Months Ended March 31, Mt. Logan Re Segregated Accounts 2017 2016 (Dollars in thousands) Ceded written premiums 54,218 56,668 Ceded earned premiums 40,597 42,904 Ceded losses and LAE 19,585 10,761 Assumed written premiums 2,732 3,560 Assumed earned premiums 2,732 3,560 Assumed losses and LAE - -

Senior Notes (Tables)

Senior Notes (Tables)	3 Months Ended
	Mar. 31, 2017
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	March 31, 2017 December 31, 2016 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value 4.868 06/05/2014 06/01/2044 400,000 $ 396,744 $ 403,468 $ 396,714 $ 383,612
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Interest expense incurred $ 4,868 $ 4,868

Long Term Subordinated Notes (T

Long Term Subordinated Notes (Tables)	3 Months Ended
	Mar. 31, 2017
Long Term Subordinated Notes [Abstract]
Schedule Of Outstanding Fixed To Floating Rate Long Term Subordinated Notes	Maturity Date March 31, 2017 December 31, 2016 Original Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Principal Amount Scheduled Final Sheet Amount Market Value Sheet Amount Market Value 6.6 04/26/2007 $ 400,000 05/15/2037 05/01/2067 $ 236,487 $ 222,456 $ 236,462 $ 204,636
Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Interest expense incurred $ 3,937 $ 3,937

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Schedule Of Underwriting Results For Operating Segments	Three Months Ended U.S. Reinsurance March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 578,958 $ 536,706 Net written premiums 517,369 470,691 Premiums earned $ 481,524 $ 486,541 Incurred losses and LAE 262,066 236,444 Commission and brokerage 102,358 117,317 Other underwriting expenses 14,251 13,459 Underwriting gain (loss) $ 102,849 $ 119,321 Three Months Ended International March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 266,417 $ 235,591 Net written premiums 245,662 202,500 Premiums earned $ 271,581 $ 250,450 Incurred losses and LAE 159,501 147,535 Commission and brokerage 66,150 64,286 Other underwriting expenses 9,480 7,823 Underwriting gain (loss) $ 36,450 $ 30,806 Three Months Ended Bermuda March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 321,122 $ 204,732 Net written premiums 305,032 184,314 Premiums earned $ 235,106 $ 194,428 Incurred losses and LAE 128,432 111,521 Commission and brokerage 58,423 49,922 Other underwriting expenses 9,480 9,185 Underwriting gain (loss) $ 38,771 $ 23,800 Three Months Ended Insurance March 31, (Dollars in thousands) 2017 2016 Gross written premiums $ 434,447 $ 376,160 Net written premiums 345,751 323,952 Premiums earned $ 323,886 $ 287,448 Incurred losses and LAE 220,789 205,249 Commission and brokerage 55,338 43,481 Other underwriting expenses 42,676 41,643 Underwriting gain (loss) $ 5,083 $ (2,925 )
Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes	Three Months Ended March 31, (Dollars in thousands) 2017 2016 Underwriting gain (loss) $ 183,153 $ 171,002 Net investment income 122,289 102,524 Net realized capital gains (losses) 52,728 (74,259 ) Net derivative gain (loss) 2,630 (3,020 ) Corporate expenses (8,457 ) (7,886 ) Interest, fee and bond issue cost amortization expense (8,964 ) (9,228 ) Other income (expense) (4,966 ) (2,066 ) Income (loss) before taxes $ 338,413 $ 177,067
Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market	Three Months Ended March 31, (Dollars in thousands) 2017 2016 United Kingdom gross written premium $ 170,820 $ 182,630

Retirement Benefits (Tables)

Retirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2017
Retirement Benefits [Abstract]
Summary Of Pension Expense	Pension Benefits Three Months Ended March 31, (Dollars in thousands) 2017 2016 Service cost $ 3,299 $ 2,897 Interest cost 2,276 2,361 Expected return on plan assets (3,155 ) (2,484 ) Amortization of net (income) loss 3,040 2,014 Net periodic benefit cost $ 5,460 $ 4,788 Other Benefits Three Months Ended March 31, (Dollars in thousands) 2017 2016 Service cost $ 440 $ 438 Interest cost 249 296 Amortization of prior service cost (33 ) - Amortization of net (income) loss 76 48 Net periodic benefit cost $ 732 $ 782

Basis Of Presentation (Schedule

Basis Of Presentation (Schedule of Effect of Newly Adopted Accounting Policies, Cash Flow) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 291,643	$ 171,686
Change in other assets and liabilities, net	12,998	12,175
Net cash provided by (used in) operating activities	381,812	375,476
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards	(11,517)	(8,331)
Net cash provided by (used in) financing activities	$ (69,427)	(142,800)
As Previously Reported [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Change in other assets and liabilities, net		3,844
Net cash provided by (used in) operating activities		367,145
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards
Net cash provided by (used in) financing activities		(134,469)
Effect Of Adoption Of New Accounting Policy [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Change in other assets and liabilities, net		8,331
Net cash provided by (used in) operating activities		8,331
CASH FLOWS FROM FINANCING ACTIVITIES:
Cost of shares withheld for taxes on settlements of share-based compensation awards		(8,331)
Net cash provided by (used in) financing activities		$ (8,331)

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Percentage threshold that triggers a review of available for sale debt securities for declines in market value	80.00%
Aggregate market value of investments in unrealized loss position	$ 5,553,825		$ 6,211,700
Gross unrealized losses on investments in unrealized loss position	189,825		220,621
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	80,341		91,871
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	109,484		128,750
Gross unrealized depreciation	0		0
Additional contractual commitments	535,550
Other invested assets	$ 1,359,252		1,333,129
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	$ 77,268		85,078
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Aggregate market value of investments in unrealized loss position	5,463,015		6,106,193
Gross unrealized losses on investments in unrealized loss position	183,299		207,837
Fixed maturity securities, duration of unrealized loss, less than 12 months, gross unrealized depreciation	80,341		91,871
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation	$ 102,958		$ 115,966
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	1.00%		1.10%
Foreign Exchange Losses [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, duration of unrealized loss, greater than 12 months, gross unrealized depreciation			$ 112,132
Private Placement Liquidity Sweep [Member]
Schedule of Available-for-sale Securities [Line Items]
Other invested assets	$ 397,757		$ 378,862

Investments (Summary Of Unreali

Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 14,542,645	$ 13,932,613
Unrealized Appreciation		371,649	382,632
Unrealized Depreciation		(183,299)	(207,837)
Market Value		14,730,995	14,107,408
OTTI in AOCI	[1]	4,734	9,235
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,434,890	1,115,208
Unrealized Appreciation		19,729	20,410
Unrealized Depreciation		(4,550)	(5,303)
Market Value		1,450,069	1,130,315
OTTI in AOCI	[1]
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		705,145	723,938
Unrealized Appreciation		18,818	18,016
Unrealized Depreciation		(11,526)	(11,970)
Market Value		712,437	729,984
OTTI in AOCI	[1]
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,307,357	5,059,388
Unrealized Appreciation		124,365	131,651
Unrealized Depreciation		(28,769)	(35,758)
Market Value		5,402,953	5,155,281
OTTI in AOCI	[1]	3,728	7,936
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		556,928	488,824
Unrealized Appreciation		1,225	1,110
Unrealized Depreciation		(901)	(1,286)
Market Value		557,252	488,648
OTTI in AOCI	[1]
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		299,824	308,827
Unrealized Appreciation		2,167	1,983
Unrealized Depreciation		(3,057)	(3,878)
Market Value		298,934	306,932
OTTI in AOCI	[1]
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,399,912	2,415,901
Unrealized Appreciation		16,437	17,478
Unrealized Depreciation		(26,172)	(27,910)
Market Value		2,390,177	2,405,469
OTTI in AOCI	[1]
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		598	642
Unrealized Appreciation		43	44
Unrealized Depreciation		(45)	(45)
Market Value		596	641
OTTI in AOCI	[1]
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,237,190	1,254,175
Unrealized Appreciation		58,713	61,226
Unrealized Depreciation		(53,139)	(57,241)
Market Value		1,242,764	1,258,160
OTTI in AOCI	[1]	159	115
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,600,801	2,565,710
Unrealized Appreciation		130,152	130,714
Unrealized Depreciation		(55,140)	(64,446)
Market Value		2,675,813	2,631,978
OTTI in AOCI	[1]	847	1,184
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		108,834	129,553
Unrealized Appreciation		2,038	2,298
Unrealized Depreciation		(6,526)	(12,784)
Market Value		104,346	119,067
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	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 14,542,645	$ 13,932,613
Fixed maturity securities - available for sale, Market Value	14,730,995	14,107,408
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,121,273	956,945
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	7,198,076	6,769,585
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	1,996,817	2,020,215
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	969,217	971,674
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,129,238	966,970
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	7,305,413	6,870,056
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	2,028,852	2,052,733
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,020,533	1,015,959
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	556,928	488,824
Fixed maturity securities - available for sale, Market Value	557,252	488,648
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	299,824	308,827
Fixed maturity securities - available for sale, Market Value	298,934	306,932
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,399,912	2,415,901
Fixed maturity securities - available for sale, Market Value	2,390,177	2,405,469
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	598	642
Fixed maturity securities - available for sale, Market Value	$ 596	$ 641

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
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 19,997	$ 204,884
Deferred tax benefit (expense)	(3,873)	(29,472)
Deferred tax benefit (expense), other-than-temporary impairment	1,225	(69)
Total URA(D) on securities arising during the period	17,349	175,343
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	18,055	200,308
Fixed Maturity Securities, Other-Than-Temporary Impairment [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	(4,501)	210
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	5,999	4,366
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in unrealized appreciation (depreciation), pre-tax	$ 444

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	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	$ 4,573,345	$ 5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(80,341)	(91,871)
Fixed maturity securities, Greater than 12 months, Market Value	980,480	1,031,292
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(109,484)	(128,750)
Fixed maturity securities, Total, Market Value	5,553,825	6,211,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(189,825)	(220,621)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	4,573,345	5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(80,341)	(91,871)
Fixed maturity securities, Greater than 12 months, Market Value	889,670	925,785
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(102,958)	(115,966)
Fixed maturity securities, Total, Market Value	5,463,015	6,106,193
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(183,299)	(207,837)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	403,943	638,740
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(4,550)	(5,303)
Fixed maturity securities, Greater than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation
Fixed maturity securities, Total, Market Value	403,943	638,740
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(4,550)	(5,303)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	206,241	221,088
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(10,966)	(11,486)
Fixed maturity securities, Greater than 12 months, Market Value	492	564
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(560)	(484)
Fixed maturity securities, Total, Market Value	206,733	221,652
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(11,526)	(11,970)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	1,293,796	1,360,743
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(19,093)	(24,023)
Fixed maturity securities, Greater than 12 months, Market Value	141,724	177,153
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,676)	(11,735)
Fixed maturity securities, Total, Market Value	1,435,520	1,537,896
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(28,769)	(35,758)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	157,135	150,023
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(467)	(565)
Fixed maturity securities, Greater than 12 months, Market Value	11,241	18,786
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(434)	(721)
Fixed maturity securities, Total, Market Value	168,376	168,809
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(901)	(1,286)
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	78,082	143,554
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(1,899)	(3,223)
Fixed maturity securities, Greater than 12 months, Market Value	21,512	7,184
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,158)	(655)
Fixed maturity securities, Total, Market Value	99,594	150,738
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(3,057)	(3,878)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	1,611,271	1,618,372
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(21,394)	(22,461)
Fixed maturity securities, Greater than 12 months, Market Value	179,414	189,665
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(4,778)	(5,449)
Fixed maturity securities, Total, Market Value	1,790,685	1,808,037
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(26,172)	(27,910)
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	99	113
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(45)	(45)
Fixed maturity securities, Total, Market Value	99	113
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(45)	(45)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	279,924	360,289
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(12,692)	(12,041)
Fixed maturity securities, Greater than 12 months, Market Value	247,576	236,820
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(40,447)	(45,200)
Fixed maturity securities, Total, Market Value	527,500	597,109
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(53,139)	(57,241)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Less than 12 months, Market Value	542,953	687,599
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(9,280)	(12,769)
Fixed maturity securities, Greater than 12 months, Market Value	287,612	295,500
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(45,860)	(51,677)
Fixed maturity securities, Total, Market Value	830,565	983,099
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(55,140)	(64,446)
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	90,810	105,507
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(6,526)	(12,784)
Fixed maturity securities, Total, Market Value	90,810	105,507
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (6,526)	$ (12,784)

Investments (Summary Of Aggre47

Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	$ 4,573,345	$ 5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(80,341)	(91,871)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	980,480	1,031,292
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(109,484)	(128,750)
Fixed maturity securities, Total, Market Value	5,553,825	6,211,700
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(189,825)	(220,621)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	4,573,345	5,180,408
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(80,341)	(91,871)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	889,670	925,785
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(102,958)	(115,966)
Fixed maturity securities, Total, Market Value	5,463,015	6,106,193
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(183,299)	(207,837)
Due In One Year Or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	338,289	178,281
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(1,311)	(1,122)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	89,469	78,153
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(21,621)	(14,318)
Fixed maturity securities, Total, Market Value	427,758	256,434
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(22,932)	(15,440)
Due In One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,599,496	2,123,113
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(22,510)	(26,263)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	497,328	538,130
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(67,024)	(84,803)
Fixed maturity securities, Total, Market Value	2,096,824	2,661,243
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(89,534)	(111,066)
Due In Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	546,075	680,334
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(20,007)	(22,555)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	84,641	86,631
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(7,210)	(8,754)
Fixed maturity securities, Total, Market Value	630,716	766,965
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(27,217)	(31,309)
Due After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	242,997	286,731
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(12,753)	(15,682)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	5,966	7,123
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(688)	(1,221)
Fixed maturity securities, Total, Market Value	248,963	293,854
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(13,441)	(16,903)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	157,135	150,023
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(467)	(565)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	11,241	18,786
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(434)	(721)
Fixed maturity securities, Total, Market Value	168,376	168,809
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(901)	(1,286)
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	1,689,353	1,761,926
Fixed maturity securities, Duration of Unrealized loss, less than 12 months, Gross Unrealized Depreciation	(23,293)	(25,684)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	201,025	196,962
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(5,981)	(6,149)
Fixed maturity securities, Total, Market Value	1,890,378	1,958,888
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (29,274)	$ (31,833)

Investments (Summary Of Compone

Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 125,890	$ 107,056
Funds held interest income (expense)	3,148	2,540
Future policy benefit reserve income (expense)	319	301
Gross investment income	128,719	109,295
Investment expenses	(6,430)	(6,771)
Net investment income	122,289	102,524
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	103,245	102,525
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	8,745	11,139
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	630	400
Limited Partnerships [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	10,998	(6,158)
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income before adjustments	$ 2,272	$ (850)

Investments (Summary Of Compo49

Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ (1,229)	$ (28,793)
Total net realized capital gains (losses)	52,728	(74,259)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	(1,229)	(28,793)
Gains (losses) from sales	11,373	(16,911)
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from fair value adjustments		(232)
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(3,436)	57
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	4,516	(8,426)
Gains (losses) from fair value adjustments	41,507	(19,955)
Short-Term Investments And Cash [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(4)	1
Other Invested Assets [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ 1

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
	Mar. 31, 2017	Mar. 31, 2016
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 428,491	$ 324,118
Gross gains from sales	15,473	8,552
Gross losses from sales	(4,100)	(25,463)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	159,117	92,448
Gross gains from sales	8,208	1,839
Gross losses from sales	$ (7,128)	$ (10,208)

Reserve For Losses, LAE And F51

Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in insurance business	$ 128	$ (295,335)
Partially offset, related to development on A&E reserves		53,909
Reinsurance receivables	1,050,540	1,018,325
Case reserve established by the Company on direct excess insurance claims	$ 10,414,046	10,312,313	$ 9,951,798
Property and Short-Tail Business [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		468,749
Explosion, Port Of Tianjin, China [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		43,280
Explosion, Port Of Tianjin, China [Member] | Estimated [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		60,000
Explosion, Port Of Tianjin, China [Member] | Projected [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		16,720
Construction Liability, Umbrella, and Workers Compenstion Reserves [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Increase (decrease) in reinsurance business		$ 173,414

Reserve For Losses, LAE And F52

Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]
Gross reserves at January 1	$ 10,312,313	$ 9,951,798
Less reinsurance recoverable	(989,934)	(990,862)	$ (881,503)
Net reserves at January 1	9,321,451	9,070,295
Incurred related to: Current year	770,660	3,434,964
Incurred related to: Prior years	128	(295,335)
Total incurred losses and LAE	770,788	3,139,629
Paid related to: Current year	106,606	745,642
Paid related to: Prior years	582,431	2,042,972
Total paid losses and LAE	689,037	2,788,614
Foreign exchange/translation adjustment	20,910	(99,859)
Net reserves at December 31	9,424,112	9,321,451
Plus reinsurance recoverable	989,934	990,862
Gross reserves at December 31	$ 10,414,046	$ 10,312,313

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017USD ($)itemsecurity	Dec. 31, 2016USD ($)	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	$ 19,429,000	$ 22,059,000
Equity Index Put Option Contracts [Member] | Fair Value [Member]
Derivative [Line Items]
Equity index put option liability	$ 19,429,000	$ 22,059,000
Standard & Poor's 500 Index [Member]
Derivative [Line Items]
Number of equity index put option contracts | security	6
Theoretical maximum payout occurs based on index value	$ 0
Discount factor	3.00%
Present value of theoretical maximum payouts	$ 448,887,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired | item	2,362.72
Standard & Poor's 500 Index [Member] | Equity Index Put Option Contracts [Member]
Derivative [Line Items]
Total consideration, net of commissions	$ 22,530,000
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	4.00%
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	$ 36,274,000
Settlement amount if contracts had expired	$ 0
Equity Index If Contracts Had Expired | item	7,322.92
FTSE 100 Index [Member] | Equity Index Put Option Contracts [Member]
Derivative [Line Items]
Total consideration, net of commissions	$ 6,706,000
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	22.00%

Derivatives (Summary Of The Fai

Derivatives (Summary Of The Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 19,429		$ 22,059
Net derivative gain (loss)	2,630	$ (3,020)
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	19,429		$ 22,059
Net derivative gain (loss)	$ 2,630	$ (3,020)

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)securityitem	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)security	Dec. 31, 2005security	Dec. 31, 2001security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of public equity portfolio	$ 284,588		$ 256,041
Number of equity index put option contracts	7			7	7
Derivatives, Number Of Indices | item	2
other invested assets	$ 253,296		263,459
Transfers between level 1 and 2	0
Transfers from level 3
Accounting Standards Update 2015-07 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
other invested assets	$ 22,118		$ 18,801
Unavailability Of Prices [Member] | Private Placement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of securities | security	42		42
Available-for-sale Securities	$ 87,124		$ 86,536

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurement Levels For All Assets And Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 14,730,995	$ 14,107,408
Equity securities, market value	104,346	119,067
Equity securities, fair value	983,459	1,010,085
Equity index put option contracts	19,429	22,059
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
Equity securities, market value	90,809	105,507
Equity securities, fair value	966,002	949,523
Equity index put option contracts
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	14,643,871	14,039,673
Equity securities, market value	13,537	13,560
Equity securities, fair value	17,457	60,562
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	87,124	67,735
Equity securities, market value
Equity securities, fair value
Equity index put option contracts	19,429	22,059
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	1,450,069	1,130,315
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	1,450,069	1,130,315
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	712,437	729,984
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	712,437	729,984
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	5,402,953	5,155,281
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	5,318,631	5,090,084
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	84,322	65,197
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	557,252	488,648
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	557,252	488,648
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	298,934	306,932
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	298,934	306,932
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	2,390,177	2,405,469
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	2,390,177	2,405,469
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	596	641
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	596	641
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	1,242,764	1,258,160
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	1,242,764	1,258,160
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	2,675,813	2,631,978
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	2,673,011	2,629,440
Foreign Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, market value	$ 2,802	$ 2,538

Fair Value (Activity Under Leve

Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 67,735	$ 5,526
Total gains or (losses) (realized/unrealized) Included in earnings	190	(989)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(29)	(6)
Purchases, issuances and settlements	19,228	11,771
Transfers in and/or (out) of Level 3
Ending balance	87,124	16,302
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		(997)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	65,197	3,933
Total gains or (losses) (realized/unrealized) Included in earnings	214	8
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(29)	(6)
Purchases, issuances and settlements	18,940	11,771
Transfers in and/or (out) of Level 3
Ending balance	84,322	15,706
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	2,538	1,593
Total gains or (losses) (realized/unrealized) Included in earnings	(24)	(997)
Purchases, issuances and settlements	288
Transfers in and/or (out) of Level 3
Ending balance	2,802	596
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		$ (997)

Fair Value (Fair Value Measur58

Fair Value (Fair Value Measurements Using Significant Unobservable Inputs For Equity Index Put Option Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value [Abstract]
Balance, beginning of period	$ 22,059	$ 40,705
Total (gains) or losses (realized/unrealized) Included in earnings	(2,630)	3,020
Total (gains) or losses (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements
Transfers in and/or (out) of Level 3
Balance, end of period	19,429	43,725
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	$ 0	$ 0

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Common Share [Abstract]
Anti-dilutive options	0	0

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
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Common Share [Abstract]
NET INCOME (LOSS)	$ 291,643	$ 171,686
Less: dividends declared-common shares and nonvested common shares	(51,281)	(48,706)
Undistributed earnings	$ 240,362	$ 122,980
Percentage allocated to common shareholders	98.90%	99.00%
Net income (loss) available to common stockholders, total	$ 237,754	$ 121,697
Add: dividends declared-common shareholders	50,753	48,210
Numerator for basic and diluted earnings per common share	$ 288,507	$ 169,907
Denominator for basic earnings per weighted-average common shares	40,529	42,129
Effect of dilutive securities: Options	267	334
Denominator for diluted earnings per adjusted weighted-average common shares	40,796	42,463
Basic	$ 7.12	$ 4.03
Diluted	$ 7.07	$ 4
Basic weighted-average common shares outstanding	40,529	42,129
Basic weighted-average common shares outstanding and nonvested common shares expected to vest	40,973	42,573

Commitments And Contingencies61

Commitments And Contingencies (Summary Of Estimated Cost To Replace Annuities For Contingent Liability) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
The Prudential [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 146,620	$ 146,507
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 32,458	$ 33,860

Other Comprehensive Income (L62

Other Comprehensive Income (Loss) (Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Before Tax	$ 36,893	$ 224,765
Total, Tax Effect	(5,647)	(38,309)
Total, Net of Tax	31,246	186,456
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	31,206	159,028
Tax Effect	(8,382)	(16,207)
Net of Tax	22,824	142,821
Reclassification, Before Tax	(6,708)	45,646
Reclassification, Tax Effect	4,509	(13,265)
Reclassification, Net of Tax	(2,199)	32,381
Total, Net of Tax	20,625		$ 66,802
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(4,501)	210
Tax Effect	1,225	(69)
Net of Tax	(3,276)	141
Total, Net of Tax	(3,276)		5,945
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	13,813	17,819
Tax Effect	(1,920)	(8,046)
Net of Tax	11,893	9,773
Total, Net of Tax	11,893		(55,341)
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax
Tax Effect
Net of Tax
Reclassification, Before Tax	3,083	2,062
Reclassification, Tax Effect	(1,079)	(722)
Reclassification, Net of Tax	2,004	$ 1,340
Total, Net of Tax	$ (2,004)		$ 2,415

Other Comprehensive Income (L63

Other Comprehensive Income (Loss) (Reclassified From Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	$ 53,957	$ (45,466)
Income tax expense (benefit)	46,770	5,381
Net income (loss)	291,643	171,686
URA(D) On Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	(6,708)	45,646
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)	(6,708)	45,646
Income tax expense (benefit)	4,509	(13,265)
Net income (loss)	(2,199)	32,381
Benefit Plan Net Gain (Loss)[Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	3,083	2,062
Income tax expense (benefit)	(1,079)	(722)
Net income (loss)	$ 2,004	$ 1,340

Other Comprehensive Income (L64

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		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 8,075,396
Current period change	31,246	$ 186,456
Balance, end of period	8,347,876	7,840,299	$ 8,075,396
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	115,558	42,811	42,811
Current period change	20,625		66,802
Balance, end of period	132,907		115,558
URA(D) On Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change	(3,276)		5,945
Foreign Currency Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(266,818)	(211,477)	(211,477)
Current period change	11,893		(55,341)
Balance, end of period	(254,925)		(266,818)
Benefit Plan Net Gain (Loss)[Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	65,504	63,089	63,089
Current period change	(2,004)		2,415
Balance, end of period	63,500		65,504
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(216,764)	(231,755)	(231,755)
Current period change	31,246	186,456
Balance, end of period	$ (185,518)	$ (45,299)	$ (216,764)

Credit Facilities (Narrative) (

Credit Facilities (Narrative) (Details) £ in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017GBP (£)item	Dec. 31, 2015	Mar. 31, 2017USD ($)item	Dec. 31, 2016GBP (£)	Dec. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, number of facilities | item	2
Line of credit facility, commitment			$ 1,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
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			5,657,511
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, commitment			600,000
Citibank Holdings Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	3 years
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment			$ 200,000		$ 200,000
Per annum commitment fee on undrawn credit	0.15%
Citibank Bilateral Agreement [Member] | Interest Rate Base Rate Option 1(a) [Member]
Line of Credit Facility [Line Items]
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			$ 5,657,511
Lloyd's of London Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, term of credit facility	4 years
Line of credit facility, commitment | £	£ 140,000			£ 140,000
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
	Mar. 31, 2017	Mar. 31, 2016
Credit Facilities [Abstract]
Credit facility fees incurred	$ 104	$ 370

Credit Facilities (Summary Of O

Credit Facilities (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details) £ in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017GBP (£)	Dec. 31, 2016GBP (£)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Line of Credit Facility [Line Items]
Commitment			$ 1,000,000
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 Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment			600,000	600,000
In Use
Wells Fargo Bank Group Credit Facility Tranche Two Issuance Two [Member]
Line of Credit Facility [Line Items]
In Use			471,285	478,233
Date of Expiry	Dec. 31, 2017	Dec. 31, 2017
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000	800,000
In Use			471,285	478,233
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000	200,000
In Use			3,672	4,058
Date of Expiry	Nov. 24, 2017	Feb. 28, 2017
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			74,702	3,672
Date of Expiry	Dec. 31, 2017	Nov. 24, 2017
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			4,058	69,404
Date of Expiry	Feb. 28, 2018	Dec. 31, 2017
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			281	269
Date of Expiry	Aug. 30, 2018	Aug. 30, 2018
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			3,788	1,163
Date of Expiry	Dec. 31, 2018
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			92,803	93,180
Date of Expiry	Mar. 20, 2021	Dec. 30, 2020
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000	200,000
In Use			$ 179,304	$ 171,746
Lloyd's Bank PLC [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 140,000	£ 140,000
In Use | £	£ 130,606	£ 130,606
Date of Expiry	Dec. 31, 2020	Dec. 31, 2019
Lloyd's of London Bank Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 140,000	£ 140,000
In Use | £	£ 130,606	£ 130,606

Collateralized Reinsurance An68

Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands	Apr. 13, 2017USD ($)item	Dec. 01, 2015USD ($)item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)item	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Effects of Reinsurance [Line Items]
Amount on deposit in trust accounts					$ 747,944
Preferred shares invested
Kilimanjaro Re Limited [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item		2		2
Kilimanjaro Re Limited [Member] | Subsequent Event [Member]
Effects of Reinsurance [Line Items]
Number of collateralized reinsurance agreements | item	6
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount			$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount		$ 300,000		$ 250,000
Catastrophe reinsurance bonds funded amount		625,000		450,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member] | Subsequent Event [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 225,000
Catastrophe reinsurance bonds funded amount	950,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount		$ 325,000		$ 200,000
Catastrophe reinsurance bonds funded amount			$ 500,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member] | Subsequent Event [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	400,000
Catastrophe reinsurance bonds funded amount	300,000
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member] | Subsequent Event [Member]
Effects of Reinsurance [Line Items]
Reinsurance coverage amount	$ 325,000
Mt. Logan Re [Member]
Effects of Reinsurance [Line Items]
Percentage of voting common shares owned by Group					100.00%
Assumed net risk exposures					$ 868,836	932,243
Preferred shares invested					$ 55,850	$ 55,536

Collateralized Reinsurance An69

Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - Mt. Logan Re Segregated Accounts [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 54,218	$ 56,668
Ceded earned premiums	40,597	42,904
Ceded losses and LAE	19,585	10,761
Assumed written premiums	2,732	3,560
Assumed earned premiums	2,732	3,560
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 ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Date Issued	Jun. 5, 2014
Principal amounts	$ 400,000,000
Debt Instrument, Term	30 years
Debt instrument, stated interest rate	4.868%	4.868%
Maturity Date	Jun. 1, 2044

Senior Notes (Schedule Of Outst

Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 396,744,000	$ 396,714,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%	4.868%
Date issued	Jun. 5, 2014
Date due	Jun. 1, 2044
Principal amounts	$ 400,000,000
Consolidated balance sheet amount	396,744,000	$ 396,714,000
Market value	$ 403,468,000	$ 383,612,000

Senior Notes (Schedule Of Inter

Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Senior Notes [Abstract]
Interest expense incurred	$ 4,868	$ 4,868

Long Term Subordinated Notes (N

Long Term Subordinated Notes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Redemption date	May 1, 2047
Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%	6.60%
Maturity Date	May 1, 2067
Percentage of principal amount required for redemption	100.00%
Outstanding debt reduction	$ 161,441
Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Applicable spread on treasury rate	0.25%
Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Applicable spread on treasury rate	0.50%
Fixed Rate Interest Period [Member] | 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] | Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Fixed Rate Interest Period [Member] | Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
Floating Rate Interest Period [Member] | Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
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 ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Consolidated balance sheet amount	$ 236,487,000	$ 236,462,000
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	$ 236,487,000	$ 236,462,000
Market value	$ 222,456,000	$ 204,636,000
Scheduled [Member] | Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 15, 2037
Final [Member] | Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Maturity Date	May 1, 2067

Long Term Subordinated Notes 75

Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Long Term Subordinated Notes [Abstract]
Interest expense incurred	$ 3,937	$ 3,937

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Underwriting Results For Operating Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Premiums earned	$ 1,312,097	$ 1,218,867
Incurred losses and LAE	770,788	700,749
Commission and brokerage	282,269	275,006
Other underwriting expenses	75,887	72,110
U.S. Reinsurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	578,958	536,706
Net written premiums	517,369	470,691
Premiums earned	481,524	486,541
Incurred losses and LAE	262,066	236,444
Commission and brokerage	102,358	117,317
Other underwriting expenses	14,251	13,459
Underwriting gain (loss)	102,849	119,321
International [Member]
Segment Reporting Information [Line Items]
Gross written premiums	266,417	235,591
Net written premiums	245,662	202,500
Premiums earned	271,581	250,450
Incurred losses and LAE	159,501	147,535
Commission and brokerage	66,150	64,286
Other underwriting expenses	9,480	7,823
Underwriting gain (loss)	36,450	30,806
Bermuda [Member]
Segment Reporting Information [Line Items]
Gross written premiums	321,122	204,732
Net written premiums	305,032	184,314
Premiums earned	235,106	194,428
Incurred losses and LAE	128,432	111,521
Commission and brokerage	58,423	49,922
Other underwriting expenses	9,480	9,185
Underwriting gain (loss)	38,771	23,800
Insurance [Member]
Segment Reporting Information [Line Items]
Gross written premiums	434,447	376,160
Net written premiums	345,751	323,952
Premiums earned	323,886	287,448
Incurred losses and LAE	220,789	205,249
Commission and brokerage	55,338	43,481
Other underwriting expenses	42,676	41,643
Underwriting gain (loss)	$ 5,083	$ (2,925)

Segment Reporting (Schedule O77

Segment Reporting (Schedule Of Underwriting Results For Operating Segments To Income (Loss) Before Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net investment income	$ 122,289	$ 102,524
Net realized capital gains (losses)	52,728	(74,259)
Net derivative gain (loss)	2,630	(3,020)
Corporate expenses	(8,457)	(7,886)
Interest, fee and bond issue cost amortization expense	(8,964)	(9,228)
Other income (expense)	(4,966)	(2,066)
INCOME (LOSS) BEFORE TAXES	338,413	177,067
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss)	183,153	171,002
Net investment income	122,289	102,524
Net realized capital gains (losses)	52,728	(74,259)
Net derivative gain (loss)	2,630	(3,020)
Corporate expenses	(8,457)	(7,886)
Interest, fee and bond issue cost amortization expense	(8,964)	(9,228)
Other income (expense)	(4,966)	(2,066)
INCOME (LOSS) BEFORE TAXES	$ 338,413	$ 177,067

Segment Reporting (Schedule O78

Segment Reporting (Schedule Of Gross Written Premiums Derived From Largest Non-U.S. Market) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
United Kingdom Gross Written Premium [Member]
Segment Reporting Information [Line Items]
Gross written premiums	$ 170,820	$ 182,630

Share-Based Compensation Plans

Share-Based Compensation Plans (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, granted | shares	151,300
Share-based compensation awards, per option fair value | $ / shares	$ 234.030
Share-based compensation awards, grant date	Feb. 22, 2017
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, granted | shares	11,245
Share-based compensation awards, per option fair value | $ / shares	$ 234.03
Share-based compensation awards, grant date	Feb. 22, 2017

Retirement Benefits (Summary Of

Retirement Benefits (Summary Of Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension contributions	$ 0	$ 0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,299	2,897
Interest cost	2,276	2,361
Expected return on plan assets	(3,155)	(2,484)
Amortization of net (income) loss	3,040	2,014
Net periodic benefit cost	5,460	4,788
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	440	438
Interest cost	249	296
Amortization of prior service cost	(33)
Amortization of net (income) loss	76	48
Net periodic benefit cost	$ 732	$ 782

Dispositions (Narrative) (Detai

Dispositions (Narrative) (Details) - Heartland Crop [Member] $ in Thousands	Aug. 24, 2016USD ($)
Proceeds from sale of business	$ 49,000
After-tax loss on sale	$ 12,942

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) - Kilimanjaro Re Limited [Member] $ in Thousands	Apr. 13, 2017USD ($)item	Dec. 01, 2015USD ($)item	Nov. 18, 2014USD ($)	Apr. 24, 2014USD ($)item
Subsequent Event [Line Items]
Number of collateralized reinsurance agreements | item		2		2
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of collateralized reinsurance agreements | item	6
Catastrophe Reinsurance Agreement 1 [Member]
Subsequent Event [Line Items]
Catastrophe reinsurance bonds funded amount		$ 625,000		$ 450,000
Catastrophe Reinsurance Agreement 1 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Catastrophe reinsurance bonds funded amount	$ 950,000
Catastrophe Reinsurance Agreement 2 [Member]
Subsequent Event [Line Items]
Catastrophe reinsurance bonds funded amount			$ 500,000
Catastrophe Reinsurance Agreement 2 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Catastrophe reinsurance bonds funded amount	$ 300,000