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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jan. 01, 2020
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | $ 2,807,438 | $ 2,992,944 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (87,277) | (122,908) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 3,329,859 | 2,771,976 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (170,104) | (192,689) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 6,137,297 | 5,764,920 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (257,381) | (315,597) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 59,698 | 64,771 | $ 28,332 | $ 0
United States Government Full Faith and Credit |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 22,652 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (422) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 22,652 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (422) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
United States Government Sponsored Agencies |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 159,997 | 250,475 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (50) | (46) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 | 0 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 | 0 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 159,997 | 250,475 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (50) | (46) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
United States Municipalities, States and Territories |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 232,070 | 31,802 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (8,611) | (3,887) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 8,110 | 868 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (11) | (1) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 240,180 | 32,670 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (8,622) | (3,888) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 2,791 | 2,844 | 0 | 0
Foreign Government Obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 13,953 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (212) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 13,953 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (212) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 |  |
Corporate Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 55,715 | 60,193 | 28,332 | 0
Corporate Securities | Finance, Insurance and Real Estate Sectors |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 360,414 | 109,789 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (24,862) | (1,733) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 0 | 0 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | 0 | 0 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 360,414 | 109,789 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (24,862) | (1,733) |  |
Corporate Securities | Manufacturing, Construction and Mining |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 139,787 | 0 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,867) | 0 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 18,107 | 19,335 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,045) | (1,384) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 157,894 | 19,335 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (6,912) | (1,384) |  |
Corporate Securities | Utilities and Related Sectors |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 351,801 | 310,823 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (14,178) | (27,509) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 159,078 | 35,408 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (6,697) | (3,628) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 510,879 | 346,231 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (20,875) | (31,137) |  |
Corporate Securities | Wholesale/Retail Trade |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 121,015 | 65,567 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (7,039) | (4,344) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 14,720 | 16,000 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (1,191) | (26) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 135,735 | 81,567 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (8,230) | (4,370) |  |
Corporate Securities | Services, Media and Other |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 347,679 | 120,098 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (15,635) | (11,564) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 99,895 | 83,890 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (38,530) | (45,897) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 447,574 | 203,988 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (54,165) | (57,461) |  |
Residential Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 250,527 | 156,016 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (2,435) | (2,384) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 52,433 | 13,599 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,356) | (1,876) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 302,960 | 169,615 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (4,791) | (4,260) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 1,192 | 1,734 | 0 | 0
Commercial Mortgage Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 97,296 | 934,593 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,390) | (54,834) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 493,065 | 35,153 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (28,235) | (9,844) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 590,361 | 969,746 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (32,625) | (64,678) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | 0
Other Asset Backed Securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 710,247 | 1,013,781 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (4,576) | (16,607) |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,484,451 | 2,567,723 |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (91,039) | (130,033) |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,194,698 | 3,581,504 |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (95,615) | (146,640) |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | $ 0 | $ 0 | $ 0 | $ 0
[1] | (1) Unrealized losses have not been reduced to reflect the allowance for credit losses of $59.7 million and $64.8 million as of March 31, 2021 and December 31, 2020, respectively.

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