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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 68 | 331
Less than 12 months, Fair value | $ 79,297 | $ 279,093
Less than 12 months, Unrealized losses | $ (468) | $ (4,063)
12 months or longer, Number of issues | security | 42 | 281
12 months or longer, Fair value | $ 65,802 | $ 337,226
12 months or longer, Unrealized losses | $ (557) | $ (8,548)
U.S. government obligations and agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 0
Less than 12 months, Fair value | $ 3,836 | $ 0
Less than 12 months, Unrealized losses | $ (108) | $ 0
12 months or longer, Number of issues | security | 4 | 13
12 months or longer, Fair value | $ 23,186 | $ 56,531
12 months or longer, Unrealized losses | $ (80) | $ (1,039)
Corporate bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 18 | 228
Less than 12 months, Fair value | $ 16,808 | $ 210,152
Less than 12 months, Unrealized losses | $ (107) | $ (3,318)
12 months or longer, Number of issues | security | 7 | 160
12 months or longer, Fair value | $ 5,866 | $ 131,225
12 months or longer, Unrealized losses | $ (34) | $ (3,418)
Mortgage-backed and asset-backed securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 42 | 36
Less than 12 months, Fair value | $ 58,023 | $ 57,487
Less than 12 months, Unrealized losses | $ (245) | $ (196)
12 months or longer, Number of issues | security | 26 | 103
12 months or longer, Fair value | $ 34,985 | $ 148,436
12 months or longer, Unrealized losses | $ (361) | $ (3,959)
Municipal bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 0 | 6
Less than 12 months, Fair value | $ 0 | $ 3,362
Less than 12 months, Unrealized losses | $ 0 | $ (43)
12 months or longer, Number of issues | security | 1 | 0
12 months or longer, Fair value | $ 276 | $ 0
12 months or longer, Unrealized losses | $ (4) | $ 0
Redeemable preferred stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 6 | 61
Less than 12 months, Fair value | $ 630 | $ 8,092
Less than 12 months, Unrealized losses | $ (8) | $ (506)
12 months or longer, Number of issues | security | 4 | 5
12 months or longer, Fair value | $ 1,489 | $ 1,034
12 months or longer, Unrealized losses | $ (78) | $ (132)

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