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	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Underwriting gain (loss)	$ 223,775	$ (253,811)	$ 336,163
Net investment income	1,164,892	642,465	647,139
Net realized capital gains (losses)	257,943	267,649	185,004
Corporate expenses	(67,827)	(41,118)	(32,966)
Interest, fee and bond issue cost amortization expense	(70,149)	(36,323)	(31,693)
Other income (expense)	36,987	6,487	(4,660)
INCOME (LOSS) BEFORE TAXES	1,545,621	585,349	1,098,987
Total income tax provision	166,538	71,198	89,526
Domestic [Member]
Income Taxes [Line Items]
Underwriting gain (loss)	(83,159)	24,041	38,964
Net investment income	707,971	339,721	325,179
Net realized capital gains (losses)	266,036	234,970	155,609
Net derivative gain (loss)
Corporate expenses	(33,334)	(15,985)	(13,063)
Interest, fee and bond issue cost amortization expense	(69,974)	(35,659)	(34,931)
Other income (expense)	23,315	(14,656)	(1,976)
INCOME (LOSS) BEFORE TAXES	810,855	532,432	469,782
Expected tax provision at the applicable statutory rate(s)	170,170	111,846	98,766
Increase (decrease) in taxes resulting from: Tax exempt income	(3,927)	(3,598)	(3,680)
Increase (decrease) in taxes resulting from: Dividend received deduction	(840)	(1,100)	(998)
Increase (decrease) in taxes resulting from: Proration	1,048	1,049	1,050
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	(13,392)	(11,513)	(9,852)
Increase (decrease) in taxes resulting from: Tax audit settlement			(1,576)
Increase (decrease) in taxes resulting from: Share based compensation tax benefits formerly in APIC	(1,950)	(2,605)	(2,984)
Increase (decrease) in taxes resulting from: Impact of CARES Act		(32,500)
Increase (decrease) in tax resulting from: Change in uncertain tax positions	324	277	138
Increase (decrease) in taxes resulting from: Valuation allowance			(8,434)
Increase (decrease) in taxes resulting from: Other	3,523	2,393	(3,744)
Total income tax provision	161,473	70,766	75,203
Non-U.S. [Member]
Income Taxes [Line Items]
Underwriting gain (loss)	306,933	(277,852)	297,199
Net investment income	456,921	302,744	321,960
Net realized capital gains (losses)	(8,094)	32,679	29,394
Net derivative gain (loss)	2,965	1,541	6,374
Corporate expenses	(34,493)	(25,133)	(19,903)
Interest, fee and bond issue cost amortization expense	(175)	(664)	3,239
Other income (expense)	10,709	19,602	(9,057)
INCOME (LOSS) BEFORE TAXES	734,766	52,917	629,206
Expected tax provision at the applicable statutory rate(s)	14,358	(10,356)	17,205
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: Share based compensation tax benefits formerly in APIC	(232)	(388)	(373)
Increase (decrease) in taxes resulting from: Impact of CARES Act
Increase (decrease) in tax resulting from: Change in uncertain tax positions	(9,796)	15,144	3,772
Increase (decrease) in taxes resulting from: Valuation allowance
Increase (decrease) in taxes resulting from: Other	735	(3,968)	(6,281)
Total income tax provision	$ 5,065	$ 432	$ 14,323

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