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Income Taxes (Reconciliation Of The Difference Between The Provision For Income Taxes And The Expected Tax Provision At The Weighted Average Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Underwriting gain (loss)												$ 336,163	$ (610,275)	$ (207,521)
Net investment income	$ 146,077	$ 181,058	$ 179,028	$ 140,976	$ 140,204	$ 161,363	$ 141,322	$ 138,294				647,139	581,183	542,898
Net realized capital gains (losses)	$ 75,443	$ (12,943)	30,272	92,232	$ (172,815)	54,804	15,776	(24,901)				185,004	(127,136)	153,194
Net derivative gain (loss)												6,374	520	9,581
Corporate expenses												(32,966)	(30,672)	(25,923)
Other income (expense)			(18,225)	(3,300)		(13,408)	(6,573)	17,033	$ (21,525)	$ 10,460	$ (2,948)	(11,034)	(24,771)	(21,215)
INCOME (LOSS) BEFORE TAXES			372,345	414,544		189,471	51,154	222,612	786,889	273,766	463,237	1,098,987	(242,182)	419,411
Total income tax expense (benefit)			$ 39,477	$ 59,993		$ (8,910)	$ (9,633)	$ 7,426	$ 99,470	$ (2,207)	$ (11,117)	89,526	(331,223)	(63,340)
Domestic [Member]
Income Taxes [Line Items]
Underwriting gain (loss)												38,964	(1,407,020)	(516,167)
Net investment income												325,179	283,569	255,310
Net realized capital gains (losses)												155,609	(90,033)	148,099
Net derivative gain (loss)
Corporate expenses												(13,063)	(11,035)	(7,394)
Interest, fee and bond issue cost amortization expense												(34,931)	(30,611)	(31,183)
Other income (expense)												(1,976)	(5,894)	32,441
INCOME (LOSS) BEFORE TAXES												469,782	(1,261,024)	(118,894)
Expected tax provision at the applicable statutory rate(s)												98,766	(264,912)	(41,614)
Increase (decrease) in tax resulting from: Tax exempt income												(3,680)	(3,824)	(8,488)
Increase (decrease) in tax resulting from: Dividend received deduction												(998)	(1,520)	(4,639)
Increase (decrease) in tax resulting from: Proration												1,050	1,150	1,760
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends												6,517	6,517	10,861
Increase (decrease) in tax resulting from: Creditable foreign premium tax												(9,852)	(13,475)	(7,515)
Increase (decrease) in tax resulting from: Tax audit settlement												1,576	2,094	11,516
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY													(43,734)
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision													(28,411)
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC												(2,984)	(3,333)	(6,716)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform														8,246
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment														(8,986)
Increase (decrease) in tax resulting from: Change in uncertain tax positions												(8,434)	8,434
Increase (decrease) in taxes resulting from: Other												(3,606)	7,579	1,641
Total income tax expense (benefit)												75,203	(337,623)	(66,966)
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)												297,199	796,745	308,646
Net investment income												321,960	297,614	287,588
Net realized capital gains (losses)												29,394	(37,103)	5,095
Net derivative gain (loss)												6,374	520	9,581
Corporate expenses												(19,903)	(19,637)	(18,529)
Interest, fee and bond issue cost amortization expense												3,239	(420)	(420)
Other income (expense)												(9,057)	(18,877)	(53,656)
INCOME (LOSS) BEFORE TAXES												629,206	1,018,842	538,305
Expected tax provision at the applicable statutory rate(s)												17,205	9,647	6,843
Increase (decrease) in tax resulting from: Tax exempt income
Increase (decrease) in tax resulting from: Dividend received deduction
Increase (decrease) in tax resulting from: Proration
Increase (decrease) in tax resulting from: Affiliated preferred stock dividends
Increase (decrease) in tax resulting from: Creditable foreign premium tax
Increase (decrease) in tax resulting from: Tax audit settlement
Increase (decrease) in tax resulting from: U.S. rate differential on carryback of net operation losses to PY
Increase (decrease) in tax resulting from: U.S. rate differential on deferred tax 2017 return to provision
Increase (decrease) in tax resulting from: Share based compensation tax benefits formerly in APIC												(373)	(120)	(235)
Increase (decrease) in tax resulting from: Impact of U.S. tax reform
Increase (decrease) in tax resulting from: Impact of prior year accounting adjustment
Increase (decrease) in tax resulting from: Change in uncertain tax positions
Increase (decrease) in taxes resulting from: Other												(2,509)	(3,127)	(2,982)
Total income tax expense (benefit)												$ 14,323	$ 6,400	$ 3,626

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