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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,788,551 | $ 5,456,980
Fair Value | 6,345,290 | 5,791,676
FNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 387,100 | 405,100
FHLMC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 344,300 | 283,100
GNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 132,300 | 147,400
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,788,551 | 5,456,980
Unrealized Gains | 585,121 | 348,310
Unrealized Losses | 28,382 | 13,614
Fair Value | 6,345,290 | 5,791,676
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 605,468 | 684,543
Unrealized Gains | 79,601 | 41,263
Unrealized Losses | 231 | 1,487
Fair Value | 684,838 | 724,319
Other, including U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 395,042 | 436,665
Unrealized Gains | 39,144 | 22,824
Unrealized Losses | 1,033 | 621
Fair Value | 433,153 | 458,868
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,612,290 | 1,545,787
Unrealized Gains | 215,711 | 141,996
Unrealized Losses | 504 | 1,580
Fair Value | 1,827,497 | 1,686,203
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 40,145 | 42,801
Unrealized Gains | 4,908 | 2,569
Unrealized Losses | 0 | 0
Fair Value | 45,053 | 45,370
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,905,207 | 1,464,444
Unrealized Gains | 221,634 | 118,775
Unrealized Losses | 3,942 | 1,795
Fair Value | 2,122,899 | 1,581,424
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,230,399 | 1,282,740
Unrealized Gains | 24,123 | 20,883
Unrealized Losses | 22,672 | 8,131
Fair Value | $ 1,231,850 | $ 1,295,492

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