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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								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Underwriting gain (loss)									$ (253,811)	$ 336,163	$ (610,275)
Net investment income	$ 222,349	$ 234,233	$ 38,083	$ 147,800	$ 146,077	$ 181,058	$ 179,028	$ 140,976	642,465	647,139	581,183
Net realized capital gains (losses)	$ 183,386	$ 110,203	$ 184,648	$ (210,588)	$ 75,443	$ (12,943)	$ 30,272	$ 92,232	267,649	185,004	(127,136)
Corporate expenses									(41,118)	(32,966)	(30,672)
Interest, fee and bond issue cost amortization expense									(36,323)	(31,693)	(31,031)
Other income (expense)									6,487	(4,660)	(24,251)
INCOME (LOSS) BEFORE TAXES									585,349	1,098,987	(242,182)
Total income tax provision									71,198	89,526	(331,223)
Domestic [Member]
Income Taxes [Line Items]
Underwriting gain (loss)									24,041	38,964	(1,407,020)
Net investment income									339,721	325,179	283,569
Net realized capital gains (losses)									234,970	155,609	(90,033)
Net derivative gain (loss)
Corporate expenses									(15,985)	(13,063)	(11,035)
Interest, fee and bond issue cost amortization expense									(35,659)	(34,931)	(30,611)
Other income (expense)									(14,656)	(1,976)	(5,894)
INCOME (LOSS) BEFORE TAXES									532,432	469,782	(1,261,024)
Expected tax provision at the applicable statutory rate(s)									111,846	98,766	(264,912)
Increase (decrease) in taxes resulting from: Tax exempt income									(3,598)	(3,680)	(3,824)
Increase (decrease) in taxes resulting from: Dividend received deduction									(1,100)	(998)	(1,520)
Increase (decrease) in taxes resulting from: Proration									1,049	1,050	1,150
Increase (decrease) in taxes resulting from: Affiliated preferred stock dividends									6,517	6,517	6,517
Increase (decrease) in taxes resulting from: Creditable foreign premium tax									(11,513)	(9,852)	(13,475)
Increase (decrease) in taxes resulting from: Tax audit settlement										(1,576)	(2,094)
Increase (decrease) in taxes resulting from: U.S. rate differential on carryback of net operation losses to PY											(43,734)
Increase (decrease) in taxes resulting from: U.S. rate differential on deferred tax 2017 return to provision											(28,411)
Increase (decrease) in taxes resulting from: Share based compensation tax benefits formerly in APIC									(2,605)	(2,984)	(3,333)
Increase (decrease) in taxes resulting from: Impact of CARES Act									(32,500)
Increase (decrease) in tax resulting from: Change in uncertain tax positions									277	138	73
Increase (decrease) in taxes resulting from: Valuation allowance										(8,434)	8,434
Increase (decrease) in taxes resulting from: Other									2,393	(3,744)	7,506
Total income tax provision									70,766	75,203	(337,623)
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)									(277,852)	297,199	796,745
Net investment income									302,744	321,960	297,614
Net realized capital gains (losses)									32,679	29,394	(37,103)
Net derivative gain (loss)									1,541	6,374	520
Corporate expenses									(25,133)	(19,903)	(19,637)
Interest, fee and bond issue cost amortization expense									(664)	3,239	(420)
Other income (expense)									19,602	(9,057)	(18,877)
INCOME (LOSS) BEFORE TAXES									52,917	629,206	1,018,842
Expected tax provision at the applicable statutory rate(s)									(10,356)	17,205	9,647
Increase (decrease) in taxes resulting from: Tax exempt income
Increase (decrease) in taxes resulting from: Dividend received deduction
Increase (decrease) in taxes resulting from: Proration
Increase (decrease) in taxes resulting from: Affiliated preferred stock dividends
Increase (decrease) in taxes resulting from: Creditable foreign premium tax
Increase (decrease) in taxes resulting from: Tax audit settlement
Increase (decrease) in taxes resulting from: U.S. rate differential on carryback of net operation losses to PY
Increase (decrease) in taxes resulting from: U.S. rate differential on deferred tax 2017 return to provision
Increase (decrease) in taxes resulting from: Share based compensation tax benefits formerly in APIC									(388)	(373)	(120)
Increase (decrease) in taxes resulting from: Impact of CARES Act
Increase (decrease) in tax resulting from: Change in uncertain tax positions									15,144	3,772	2,257
Increase (decrease) in taxes resulting from: Valuation allowance
Increase (decrease) in taxes resulting from: Other									(3,968)	(6,281)	(5,384)
Total income tax provision									$ 432	$ 14,323	$ 6,400

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