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Investments Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments [Abstract]      
Gross realized gains $ 35,035 $ 11,613 $ 7,050
Gross realized losses (16,093) (9,287) (1,480)
Investment income $ 18,942 $ 2,326 $ 5,570