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Investments (Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type) (Details) - USD ($) $ in Thousands	Mar. 31, 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	$ (28,026)	$ (120,838)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	7,719,536	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(195,377)	(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	1,282,933	4,265,915
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(28,026)	(120,838)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	6,436,603	5,548,934
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(167,351)	(247,060)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	7,719,536	9,814,849
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(195,377)	(367,898)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	37,959	76,226
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(7)	(158)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	744,365	777,409
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(9,725)	(14,943)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	782,324	853,635
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(9,732)	(15,101)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	11,115	71,559
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(296)	(1,444)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	34,646	38,105
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(557)	(1,395)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	45,761	109,664
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(853)	(2,839)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	662,132	2,513,463
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(15,967)	(69,619)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	2,433,428	1,683,729
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(41,355)	(71,896)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	3,095,560	4,197,192
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(57,322)	(141,515)
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	227,072	230,285
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(1,347)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	294,558	245,300
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(1,737)	(2,746)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	521,630	475,585
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(3,084)	(5,492)
Commercial 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	8,675	71,167
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(56)	(1,128)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	142,509	154,201
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(2,214)	(4,212)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	151,184	225,368
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(2,270)	(5,340)
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	27,212	156,930
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(74)	(975)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,326,304	1,373,629
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(29,244)	(42,846)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,353,516	1,530,559
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(29,318)	(43,821)
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	9,737	10,174
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(36)	(26)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	9,737	10,174
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(36)	(26)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	101,317	196,303
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(5,008)	(9,719)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	420,137	494,156
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(33,723)	(46,187)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	521,454	690,459
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	(38,731)	(55,906)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Market Value	197,714	939,808
Fixed maturity securities, Duration of Unrealized Loss, Less than 12 months, Gross Unrealized Depreciation	(5,235)	(35,023)
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Market Value	1,040,656	782,405
Fixed maturity securities, Duration of Unrealized Loss, Greater than 12 months, Gross Unrealized Depreciation	(48,796)	(62,835)
Fixed maturity securities, Duration of Unrealized Loss, Total, Market Value	1,238,370	1,722,213
Fixed maturity securities, Duration of Unrealized Loss, Total, Gross Unrealized Depreciation, Total	$ (54,031)	$ (97,858)

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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=82897076&loc=d3e27337-111563

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