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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | $ 790,313 |  | $ 2,992,944 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (24,290) |  | (122,908) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,719,402 |  | 2,771,976 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (86,097) |  | (192,689) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,509,715 |  | 5,764,920 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (110,387) |  | (315,597) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 14,190 | $ 59,698 | 64,771 | $ 50,186 | $ 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 |  | 1,024 |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (21) |  |  |  |  |
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 |  | 1,024 |  |  |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (21) |  |  |  |  |
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 |  |  |  | 250,475 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] |  |  | (46) |  |  |
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 |  |  |  | 250,475 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] |  |  | (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 |  | 77,867 |  | 31,802 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,294) |  | (3,887) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 23,471 |  | 868 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (3,353) |  | (1) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 101,338 |  | 32,670 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (4,647) |  | (3,888) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 3,347 | 2,791 | 2,844 | 0 | 0 | 0
Corporate Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 10,723 | 55,715 | 60,193 | 46,749 | 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 |  | 57,198 |  | 109,789 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (3,141) |  | (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 |  | 57,198 |  | 109,789 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (3,141) |  | (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 |  | 36,493 |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (822) |  | 0 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 19,526 |  | 19,335 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (622) |  | (1,384) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 56,019 |  | 19,335 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (1,444) |  | (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 |  | 95,926 |  | 310,823 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (2,384) |  | (27,509) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 129,273 |  | 35,408 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (2,719) |  | (3,628) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 225,199 |  | 346,231 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (5,103) |  | (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 |  | 69,030 |  | 65,567 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,243) |  | (4,344) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 14,363 |  | 16,000 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (598) |  | (26) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 83,393 |  | 81,567 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (1,841) |  | (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 |  | 51,277 |  | 120,098 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (11,107) |  | (11,564) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 54,762 |  | 83,890 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (4,422) |  | (45,897) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 106,039 |  | 203,988 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (15,529) |  | (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 |  | 74,538 |  | 156,016 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,083) |  | (2,384) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 46,016 |  | 13,599 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (1,548) |  | (1,876) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 120,554 |  | 169,615 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (2,631) |  | (4,260) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 120 | 1,192 | 1,734 | 777 | 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 |  | 83,348 |  | 934,593 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,537) |  | (54,834) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 364,942 |  | 35,153 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (24,214) |  | (9,844) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 448,290 |  | 969,746 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (25,751) |  | (64,678) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | 2,660 | 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 |  | 243,612 |  | 1,013,781 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,658) |  | (16,607) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,067,049 |  | 2,567,723 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (48,621) |  | (130,033) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 2,310,661 |  | 3,581,504 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (50,279) |  | (146,640) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
[1] | Unrealized losses have not been reduced to reflect the allowance for credit losses of $14.2 million and $64.8 million as of June 30, 2021 and December 31, 2020, respectively.

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