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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Summary of realized investment gains (losses) [Abstract]        
Gross gains $ 543 $ 35 $ 1,497 $ 5,493
Gross losses (16) (28) (86) (387)
Realized investment gains, net $ 527 $ 7 $ 1,411 $ 5,106