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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	Sep. 30, 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	$ 1,332,893	$ 4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(23,779)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,484,503	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(111,399)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,817,396	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(135,178)	(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	76,571	454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,341)	(2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	446,039	427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(22,077)	(20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	522,610	881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(23,418)	(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	354,417	2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(6,986)	(45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	982,505	2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(55,581)	(129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,336,922	4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(62,567)	(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	330,090	1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(10,236)	(51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	118,854	492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(14,860)	(34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	448,944	1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(25,096)	(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	193,660	245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(3,076)	(16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	94,925	91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(10,610)	(12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	288,585	336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(13,686)	(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	337,232	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(2,029)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	175,138	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(689)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	512,370	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,718)	(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	40,923	238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(111)	(2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	667,042	1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(7,582)	(47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	707,965	1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (7,693)	$ (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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