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Investments - Rollforward of OTTI Recognized in Net Income, Fixed-maturity Securities Still Held (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other than Temporary Impairment, OTTI Recognized in Earnings [Roll Forward]        
Cumulative OTTI recognized in net income for securities still held, beginning of period $ 4,298 $ 5,759 $ 4,346 $ 5,774
Additions for securities where OTTI have been recognized prior to the beginning of the period 54 459 103 535
Reductions due to sales, maturities, calls, amortization or increases in cash flows expected to be collected over the remaining life of credit impaired securities (1,058) (643) (1,155) (597)
Reductions for exchanges of securities previously impaired       (137)
Cumulative OTTI recognized in net income for securities still held, end of period $ 3,294 $ 5,575 $ 3,294 $ 5,575