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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 331 | 306
Less than 12 months, Fair value | $ 279,093 | $ 345,882
Less than 12 months, Unrealized losses | $ (4,063) | $ (2,359)
12 months or longer, Number of issues | security | 281 | 115
12 months or longer, Fair value | $ 337,226 | $ 172,524
12 months or longer, Unrealized losses | $ (8,548) | $ (3,601)
U.S. government obligations and agencies | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 0 | 7
Less than 12 months, Fair value | $ 0 | $ 35,464
Less than 12 months, Unrealized losses | $ 0 | $ (301)
12 months or longer, Number of issues | security | 13 | 9
12 months or longer, Fair value | $ 56,531 | $ 24,140
12 months or longer, Unrealized losses | $ (1,039) | $ (576)
Corporate bonds | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 228 | 159
Less than 12 months, Fair value | $ 210,152 | $ 142,208
Less than 12 months, Unrealized losses | $ (3,318) | $ (792)
12 months or longer, Number of issues | security | 160 | 39
12 months or longer, Fair value | $ 131,225 | $ 29,796
12 months or longer, Unrealized losses | $ (3,418) | $ (516)
Mortgage-backed and asset-backed securities | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 36 | 83
Less than 12 months, Fair value | $ 57,487 | $ 137,481
Less than 12 months, Unrealized losses | $ (196) | $ (955)
12 months or longer, Number of issues | security | 103 | 37
12 months or longer, Fair value | $ 148,436 | $ 70,218
12 months or longer, Unrealized losses | $ (3,959) | $ (1,568)
Municipal bonds | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 6 | 36
Less than 12 months, Fair value | $ 3,362 | $ 28,265
Less than 12 months, Unrealized losses | $ (43) | $ (246)
12 months or longer, Number of issues | security | 0 | 30
12 months or longer, Fair value | $ 0 | $ 48,370
12 months or longer, Unrealized losses | $ 0 | $ (941)
Redeemable preferred stock | Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 61 | 21
Less than 12 months, Fair value | $ 8,092 | $ 2,464
Less than 12 months, Unrealized losses | $ (506) | $ (65)
12 months or longer, Number of issues | security | 5 | 0
12 months or longer, Fair value | $ 1,034 | $ 0
12 months or longer, Unrealized losses | $ (132) | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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