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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 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 |  | $ 966,046 |  | $ 2,992,944 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (10,254) |  | (122,908) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,634,534 |  | 2,771,976 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (81,791) |  | (192,689) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 3,600,580 |  | 5,764,920 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (92,045) |  | (315,597) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 4,074 | $ 14,190 | 64,771 | $ 61,619 | $ 50,186 | $ 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 |  | 1,019 |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (24) |  |  |  |  |
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 |  | 1,019 |  |  |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (24) |  |  |  |  |
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 |  | 40,043 |  | 31,802 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (582) |  | (3,887) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 23,961 |  | 868 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (3,378) |  | (1) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 64,004 |  | 32,670 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (3,960) |  | (3,888) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 2,772 | 3,347 | 2,844 | 0 | 0 | 0
Corporate Securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value |  | 419,976 |  | 606,277 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (6,997) |  | (45,150) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 164,005 |  | 154,633 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (8,527) |  | (50,935) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 583,981 |  | 760,910 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (15,524) |  | (96,085) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 1,006 | 10,723 | 60,193 | 53,045 | 46,749 | 0
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 |  | 83,291 |  | 156,016 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (455) |  | (2,384) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 40,947 |  | 13,599 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (1,999) |  | (1,876) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 124,238 |  | 169,615 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (2,454) |  | (4,260) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 296 | 120 | 1,734 | 1,221 | 777 | 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 |  | 56,781 |  | 934,593 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (354) |  | (54,834) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 349,533 |  | 35,153 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (23,051) |  | (9,844) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 406,314 |  | 969,746 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (23,405) |  | (64,678) |  |  |
Fixed maturity securities, available for sale, allowance for credit losses |  | 0 | 0 | 0 | 7,353 | 2,660 | 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 |  | 364,936 |  | 1,013,781 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | [1] | (1,842) |  | (16,607) |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value |  | 2,056,088 |  | 2,567,723 |  |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | [1] | (44,836) |  | (130,033) |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value |  | 2,421,024 |  | 3,581,504 |  |  |
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | [1] | (46,678) |  | (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 $4.1 million and $64.8 million as of September 30, 2021 and December 31, 2020, respectively.

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