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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
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	$ 1,730,364	$ 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(26,793)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,909,627	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(94,376)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,639,991	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(121,169)	(367,898)
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	67,879	454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,237)	(2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	416,583	427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(23,004)	(20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	484,462	881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(24,241)	(23,233)
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	464,753	2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(7,960)	(45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	689,195	2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(38,138)	(129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,153,948	4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(46,098)	(175,088)
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	495,741	1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(12,388)	(51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	103,612	492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,100)	(34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	599,353	1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(23,488)	(85,510)
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	98,043	245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,658)	(16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	90,328	91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(11,678)	(12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	188,371	336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(13,336)	(29,388)
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	176,222	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,027)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	94,190	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(831)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	270,412	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,858)	(5,492)
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	427,726	238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(2,523)	(2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	515,719	1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,625)	(47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	943,445	1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (12,148)	$ (49,187)

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563

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