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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, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Allowance for credit losses | $ (1,745) |
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,225,067 | 16,473,491
Allowance for credit losses | (1,745) |
Unrealized Appreciation | 941,663 | 472,622
Unrealized Depreciation | (124,812) | (121,169)
Market Value | 20,040,173 | 16,824,944
OTTI in AOCI |  | 987
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,325,156 | 1,489,660
Allowance for credit losses |  |
Unrealized Appreciation | 49,084 | 28,357
Unrealized Depreciation | (7,134) | (2,214)
Market Value | 1,367,106 | 1,515,803
OTTI in AOCI |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 543,895 | 507,353
Allowance for credit losses |  |
Unrealized Appreciation | 34,654 | 29,651
Unrealized Depreciation | (1,254) | (89)
Market Value | 577,295 | 536,915
OTTI in AOCI |  |
Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,824,800 | 6,227,661
Allowance for credit losses | (1,220) |
Unrealized Appreciation | 380,677 | 185,052
Unrealized Depreciation | (55,231) | (37,767)
Market Value | 7,149,026 | 6,374,946
OTTI in AOCI |  | 469
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,540,809 | 892,373
Allowance for credit losses |  |
Unrealized Appreciation | 30,691 | 6,818
Unrealized Depreciation | (5,698) | (1,858)
Market Value | 2,565,802 | 897,333
OTTI in AOCI |  |
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 915,923 | 814,570
Allowance for credit losses |  |
Unrealized Appreciation | 75,275 | 31,236
Unrealized Depreciation | (895) | (1,249)
Market Value | 990,303 | 844,557
OTTI in AOCI |  |
Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,206,139 | 2,173,099
Allowance for credit losses |  |
Unrealized Appreciation | 64,663 | 36,361
Unrealized Depreciation | (3,063) | (10,879)
Market Value | 2,267,739 | 2,198,581
OTTI in AOCI |  |
Non-Agency Residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,187 | 5,723
Allowance for credit losses |  |
Unrealized Appreciation | 9 |
Unrealized Depreciation | (2) | (20)
Market Value | 5,194 | 5,703
OTTI in AOCI |  |
Foreign Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,565,260 | 1,492,315
Allowance for credit losses | (22) |
Unrealized Appreciation | 102,587 | 47,148
Unrealized Depreciation | (22,450) | (33,513)
Market Value | 1,645,375 | 1,505,950
OTTI in AOCI |  | 71
Foreign Corporate Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,297,898 | 2,870,737
Allowance for credit losses | (503) |
Unrealized Appreciation | 204,023 | 107,999
Unrealized Depreciation | (29,085) | (33,580)
Market Value | $ 3,472,333 | 2,945,156
OTTI in AOCI |  | $ 447

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