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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total $ 13,301,713 $ 12,831,159
Unrealized Appreciation 392,913 426,973
Unrealized Depreciation (203,666) (157,065)
Market Value 13,490,960 13,101,067
OTTI in AOCI [1] 2,043 (6,910)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 337,271 221,052
Unrealized Appreciation 15,725 10,290
Unrealized Depreciation (70) (304)
Market Value 352,926 231,038
Obligations Of U.S. States And Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 683,715 783,129
Unrealized Appreciation 32,087 41,969
Unrealized Depreciation (1,523) (626)
Market Value 714,279 824,472
Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 4,964,570 4,626,002
Unrealized Appreciation 118,763 143,889
Unrealized Depreciation (76,396) (62,906)
Market Value 5,006,937 4,706,985
OTTI in AOCI [1] 2,006 (6,910)
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 437,376 340,761
Unrealized Appreciation 2,575 1,691
Unrealized Depreciation (1,554) (1,230)
Market Value 438,397 341,222
Commercial Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 277,907 231,439
Unrealized Appreciation 7,697 10,675
Unrealized Depreciation (795) (429)
Market Value 284,809 241,685
Agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 2,392,937 2,157,182
Unrealized Appreciation 39,295 37,555
Unrealized Depreciation (6,165) (11,573)
Market Value 2,426,067 2,183,164
Non-Agency Residential [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 971 2,734
Unrealized Appreciation 53 54
Unrealized Depreciation (46) (57)
Market Value 978 2,731
Foreign Government Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 1,285,006 1,488,144
Unrealized Appreciation 60,837 71,177
Unrealized Depreciation (44,882) (26,866)
Market Value 1,300,961 1,532,455
OTTI in AOCI [1] (2)  
Foreign Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 2,921,960 2,980,716
Unrealized Appreciation 115,881 109,673
Unrealized Depreciation (72,235) (53,074)
Market Value 2,965,606 3,037,315
OTTI in AOCI [1] 39  
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Total 127,411 148,326
Unrealized Appreciation 3,509 3,831
Unrealized Depreciation (17,921) (11,947)
Market Value $ 112,999 $ 140,210
[1] Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date