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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 16,473,491 |
Unrealized Appreciation | 472,622 |
Unrealized Depreciation | (121,169) |
OTTI in AOCI | 987 |
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,473,491 | $ 15,406,572
Unrealized Appreciation | 472,622 | 186,589
Unrealized Depreciation | (121,169) | (367,898)
Market Value | 16,824,944 | 15,225,263
OTTI in AOCI | 987 | 2,545
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,489,660 | 2,629,454
Unrealized Appreciation | 28,357 | 16,781
Unrealized Depreciation | (2,214) | (15,101)
Market Value | 1,515,803 | 2,631,134
OTTI in AOCI |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 507,353 | 490,018
Unrealized Appreciation | 29,651 | 12,915
Unrealized Depreciation | (89) | (2,839)
Market Value | 536,915 | 500,094
OTTI in AOCI |  | 439
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,227,661 | 5,538,582
Unrealized Appreciation | 185,052 | 48,465
Unrealized Depreciation | (37,767) | (141,515)
Market Value | 6,374,946 | 5,445,532
OTTI in AOCI | 469 | 1,688
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 892,373 | 545,427
Unrealized Appreciation | 6,818 | 162
Unrealized Depreciation | (1,858) | (5,492)
Market Value | 897,333 | 540,097
OTTI in AOCI |  |
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 814,570 | 329,883
Unrealized Appreciation | 31,236 | 2,167
Unrealized Depreciation | (1,249) | (5,340)
Market Value | 844,557 | 326,710
OTTI in AOCI |  |
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,173,099 | 1,832,760
Unrealized Appreciation | 36,361 | 7,325
Unrealized Depreciation | (10,879) | (43,821)
Market Value | 2,198,581 | 1,796,264
OTTI in AOCI |  |
Non-Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,723 | 10,198
Unrealized Appreciation |  | 37
Unrealized Depreciation | (20) | (26)
Market Value | 5,703 | 10,209
OTTI in AOCI |  |
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,492,315 | 1,335,328
Unrealized Appreciation | 47,148 | 34,743
Unrealized Depreciation | (33,513) | (55,906)
Market Value | 1,505,950 | 1,314,165
OTTI in AOCI | 71 | 98
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,870,737 | 2,694,922
Unrealized Appreciation | 107,999 | 63,994
Unrealized Depreciation | (33,580) | (97,858)
Market Value | 2,945,156 | 2,661,058
OTTI in AOCI | $ 447 | $ 320

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