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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,456,980 | $ 7,373,911
Fair Value | 5,791,676 | 7,515,318
Fixed maturity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,456,980 | 7,373,911
Unrealized Gains | 348,310 | 249,085
Unrealized Losses | 13,614 | 107,678
Fair Value | 5,791,676 | 7,515,318
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 684,543 | 778,038
Unrealized Gains | 41,263 | 22,724
Unrealized Losses | 1,487 | 13,321
Fair Value | 724,319 | 787,441
Other, including U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 436,665 | 835,096
Unrealized Gains | 22,824 | 16,127
Unrealized Losses | 621 | 17,681
Fair Value | 458,868 | 833,542
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,545,787 | 1,884,313
Unrealized Gains | 141,996 | 133,150
Unrealized Losses | 1,580 | 13,494
Fair Value | 1,686,203 | 2,003,969
Foreign government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 42,801 | 83,343
Unrealized Gains | 2,569 | 2,321
Unrealized Losses | 0 | 760
Fair Value | 45,370 | 84,904
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,464,444 | 2,054,105
Unrealized Gains | 118,775 | 64,296
Unrealized Losses | 1,795 | 38,891
Fair Value | 1,581,424 | 2,079,510
Other mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,282,740 | 1,739,016
Unrealized Gains | 20,883 | 10,467
Unrealized Losses | 8,131 | 23,531
Fair Value | 1,295,492 | 1,725,952
FNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 405,100 | 441,300
FHLMC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 283,100 | 417,300
GNMA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 147,400 | $ 96,500

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