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Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 1,061,192 | $ 815,647 |
Allowance for Expected Credit Losses | (489) | (186) | $ 0
Gross Unrealized Gains | 1,129 | 5,465 |
Gross Unrealized Losses | (21,377) | (1,065) |
Fair Value | 1,040,455 | 819,861 |
U.S. government obligations and agencies | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 27,076 | 59,529 |
Allowance for Expected Credit Losses | 0 | 0 |
Gross Unrealized Gains | 64 | 157 |
Gross Unrealized Losses | (334) | (55) |
Fair Value | 26,806 | 59,631 |
Corporate bonds | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 687,058 | 416,758 |
Allowance for Expected Credit Losses | (371) | (148) |
Gross Unrealized Gains | 843 | 3,571 |
Gross Unrealized Losses | (13,725) | (337) |
Fair Value | 673,805 | 419,844 |
Mortgage-backed and asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 322,844 | 319,377 |
Fair Value | 316,118 | 319,937 |
Mortgage-backed and asset-backed securities | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 322,844 | 319,377 |
Allowance for Expected Credit Losses | 0 | 0 |
Gross Unrealized Gains | 194 | 1,175 |
Gross Unrealized Losses | (6,920) | (615) |
Fair Value | 316,118 | 319,937 |
Municipal bonds | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 14,925 | 11,990 |
Allowance for Expected Credit Losses | (1) | 0 |
Gross Unrealized Gains | 0 | 138 |
Gross Unrealized Losses | (350) | 0 |
Fair Value | 14,574 | 12,128 |
Redeemable preferred stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for Expected Credit Losses | (117) | (38) | $ 0
Redeemable preferred stock | Fixed Maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 9,289 | 7,993 |
Allowance for Expected Credit Losses | (117) | (38) |
Gross Unrealized Gains | 28 | 424 |
Gross Unrealized Losses | (48) | (58) |
Fair Value | $ 9,152 | $ 8,321 |

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