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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income before income taxes      
Federal $ 39,419 $ 45,456 $ 57,950
Foreign (1,074) (1,157) 0
Income before income taxes $ 38,345 $ 44,299 $ 57,950