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Investments - Costs and Fair Values of Fixed-Maturity and Equity Securities Classified as Trading Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Total trading securities, cost $ 13,597 $ 6,172
Total trading securities, Fair value 13,610 6,228
Fixed-maturity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Total trading securities, cost 13,597 4,801
Total trading securities, Fair value $ 13,610 4,800
Equity Securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Total trading securities, cost   1,371
Total trading securities, Fair value   $ 1,428