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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