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Investments - Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net realized investment gains (losses)      
Net realized investment gains (losses) $ 6,103 $ (2,010) $ 1,334
Available-for-sale securities      
Available-for-sale securities:      
Gross realized gains 6,258 1,892  
Gross realized losses (1,639) (3,189)  
Net realized gains (losses) on available-for-sale securities 4,619 (1,297)  
Available-for-sale securities      
Available-for-sale securities:      
Gross realized gains     2,996
Gross realized losses     (1,756)
Net realized gains (losses) on available-for-sale securities     1,240
Equity securities      
Equity securities      
Equity securities 1,484 (819)  
Miscellaneous      
Net realized investment gains (losses)      
Miscellaneous $ 0 $ 106 $ 94