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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 16,392,238,000 |  |
Allowance for Credit Losses | (25,837,000) | $ (21,774,000) | $ 0
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 16,392,238,000 |  | 16,473,491,000
Allowance for Credit Losses | (25,837,000) |  |
Unrealized Appreciation | 858,245,000 |  | 472,622,000
Unrealized Depreciation | (169,387,000) |  | (121,169,000)
Market Value | 17,055,259,000 |  | 16,824,944,000
OTTI in AOCI |  |  | 987,000
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,355,970,000 |  | 1,489,660,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation | 79,243,000 |  | 28,357,000
Unrealized Depreciation | (282,000) |  | (2,214,000)
Market Value | 1,434,931,000 |  | 1,515,803,000
OTTI in AOCI |  |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 508,478,000 |  | 507,353,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation | 27,597,000 |  | 29,651,000
Unrealized Depreciation | (3,794,000) |  | (89,000)
Market Value | 532,281,000 |  | 536,915,000
OTTI in AOCI |  |  |
Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,349,631,000 |  | 6,227,661,000
Allowance for Credit Losses | (22,253,000) | (17,305,000) |
Unrealized Appreciation | 356,702,000 |  | 185,052,000
Unrealized Depreciation | (66,292,000) |  | (37,767,000)
Market Value | 6,617,788,000 |  | 6,374,946,000
OTTI in AOCI |  |  | 469,000
Asset-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,076,648,000 |  | 892,373,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation | 16,728,000 |  | 6,818,000
Unrealized Depreciation | (23,818,000) |  | (1,858,000)
Market Value | 1,069,558,000 |  | 897,333,000
OTTI in AOCI |  |  |
Commercial Mortgage-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 850,616,000 |  | 814,570,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation | 71,017,000 |  | 31,236,000
Unrealized Depreciation | (1,837,000) |  | (1,249,000)
Market Value | 919,796,000 |  | 844,557,000
OTTI in AOCI |  |  |
Agency Residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,016,481,000 |  | 2,173,099,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation | 74,813,000 |  | 36,361,000
Unrealized Depreciation | (2,043,000) |  | (10,879,000)
Market Value | 2,089,251,000 |  | 2,198,581,000
OTTI in AOCI |  |  |
Non-Agency Residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,153,000 |  | 5,723,000
Allowance for Credit Losses |  |  |
Unrealized Appreciation |  |  |
Unrealized Depreciation | (42,000) |  | (20,000)
Market Value | 3,111,000 |  | 5,703,000
OTTI in AOCI |  |  |
Foreign Government Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,461,380,000 |  | 1,492,315,000
Allowance for Credit Losses | (92,000) | (519,000) |
Unrealized Appreciation | 73,849,000 |  | 47,148,000
Unrealized Depreciation | (33,937,000) |  | (33,513,000)
Market Value | 1,501,200,000 |  | 1,505,950,000
OTTI in AOCI |  |  | 71,000
Foreign Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,769,881,000 |  | 2,870,737,000
Allowance for Credit Losses | (3,492,000) | $ (3,950,000) |
Unrealized Appreciation | 158,296,000 |  | 107,999,000
Unrealized Depreciation | (37,342,000) |  | (33,580,000)
Market Value | $ 2,887,343,000 |  | 2,945,156,000
OTTI in AOCI |  |  | $ 447,000

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