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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Sep. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 251 | 404
Less than 12 months, Fair value | $ 265,467 | $ 682,402
Less than 12 months, Unrealized losses | $ (28,438) | $ (13,818)
12 months or longer, Number of issues | security | 281 | 33
12 months or longer, Fair value | $ 379,129 | $ 45,645
12 months or longer, Unrealized losses | $ (73,255) | $ (1,853)
Fixed Maturities | U.S. government obligations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 4
Less than 12 months, Fair value | $ 2,720 | $ 18,913
Less than 12 months, Unrealized losses | $ (113) | $ (111)
12 months or longer, Number of issues | security | 5 | 4
12 months or longer, Fair value | $ 8,878 | $ 5,016
12 months or longer, Unrealized losses | $ (891) | $ (223)
Fixed Maturities | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 123 | 249
Less than 12 months, Fair value | $ 136,528 | $ 378,595
Less than 12 months, Unrealized losses | $ (17,249) | $ (7,468)
12 months or longer, Number of issues | security | 173 | 18
12 months or longer, Fair value | $ 202,294 | $ 17,356
12 months or longer, Unrealized losses | $ (37,753) | $ (679)
Fixed Maturities | Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 116 | 145
Less than 12 months, Fair value | $ 121,753 | $ 274,883
Less than 12 months, Unrealized losses | $ (10,259) | $ (5,969)
12 months or longer, Number of issues | security | 96 | 11
12 months or longer, Fair value | $ 157,818 | $ 23,273
12 months or longer, Unrealized losses | $ (32,515) | $ (951)
Fixed Maturities | Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 3 | 5
Less than 12 months, Fair value | $ 2,299 | $ 9,811
Less than 12 months, Unrealized losses | $ (390) | $ (269)
12 months or longer, Number of issues | security | 7 | 0
12 months or longer, Fair value | $ 10,139 | $ 0
12 months or longer, Unrealized losses | $ (2,096) | $ 0
Fixed Maturities | Redeemable preferred stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 7 | 1
Less than 12 months, Fair value | $ 2,167 | $ 200
Less than 12 months, Unrealized losses | $ (427) | $ (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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