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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	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	$ (21,807)	$ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(367,898)
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	939,439	4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(21,807)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	3,661,103	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(123,085)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	4,600,542	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(144,892)	(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	72,925	454,239
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,270)	(2,558)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	653,276	427,513
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(21,829)	(20,675)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	726,201	881,752
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(23,099)	(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	251,725	2,014,704
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(4,989)	(45,148)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,317,255	2,764,981
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(64,110)	(129,940)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,568,980	4,779,685
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(69,099)	(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	223,082	1,082,568
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(12,638)	(51,300)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	216,841	492,216
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12,797)	(34,210)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	439,923	1,574,784
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(25,435)	(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	29,169	245,848
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,709)	(16,957)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	123,166	91,094
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(10,939)	(12,431)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	152,335	336,942
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(12,648)	(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	313,948	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,051)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	206,558	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(907)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	520,506	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(1,958)	(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	48,590	238,271
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(150)	(2,129)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,144,007	1,527,830
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(12,503)	(47,058)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,192,597	1,766,101
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (12,653)	$ (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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