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Investments (Details 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Sales proceeds $ 708 $ 11,541 $ 14,326 $ 30,610
Realized gains 261 206 573 230
Realized losses 0 (71) (15) (349)
Net realized gains (losses) $ 261 $ 135 $ 558 $ (119)