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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 107 | 404
Less than 12 months, Fair value | $ 82,130 | $ 682,402
Less than 12 months, Unrealized losses | $ (6,045) | $ (13,818)
12 months or longer, Number of issues | security | 401 | 33
12 months or longer, Fair value | $ 560,745 | $ 45,645
12 months or longer, Unrealized losses | $ (85,470) | $ (1,853)
U.S. government obligations and agencies | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 4
Less than 12 months, Fair value | $ 2,721 | $ 18,913
Less than 12 months, Unrealized losses | $ (110) | $ (111)
12 months or longer, Number of issues | security | 5 | 4
12 months or longer, Fair value | $ 8,943 | $ 5,016
12 months or longer, Unrealized losses | $ (828) | $ (223)
Corporate bonds | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 40 | 249
Less than 12 months, Fair value | $ 26,563 | $ 378,595
Less than 12 months, Unrealized losses | $ (2,910) | $ (7,468)
12 months or longer, Number of issues | security | 247 | 18
12 months or longer, Fair value | $ 325,992 | $ 17,356
12 months or longer, Unrealized losses | $ (46,451) | $ (679)
Mortgage-backed and asset-backed securities | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 64 | 145
Less than 12 months, Fair value | $ 52,751 | $ 274,883
Less than 12 months, Unrealized losses | $ (2,974) | $ (5,969)
12 months or longer, Number of issues | security | 146 | 11
12 months or longer, Fair value | $ 219,189 | $ 23,273
12 months or longer, Unrealized losses | $ (36,733) | $ (951)
Municipal bonds | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 0 | 5
Less than 12 months, Fair value | $ 0 | $ 9,811
Less than 12 months, Unrealized losses | $ 0 | $ (269)
12 months or longer, Number of issues | security | 3 | 0
12 months or longer, Fair value | $ 6,621 | $ 0
12 months or longer, Unrealized losses | $ (1,458) | $ 0
Redeemable preferred stock | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 1 | 1
Less than 12 months, Fair value | $ 95 | $ 200
Less than 12 months, Unrealized losses | $ (51) | $ (1)
12 months or longer, Number of issues | security | 0 | 0
12 months or longer, Fair value | $ 0 | $ 0
12 months or longer, Unrealized losses | $ 0 | $ 0

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