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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Summary of realized investment gains (losses) [Abstract]        
Gross gains $ 1,409 $ 132 $ 2,340 $ 954
Gross losses (13) 0 (61) (70)
Realized investment gains, net $ 1,396 $ 132 $ 2,279 $ 884