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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income before income taxes      
Federal $ 33,830 $ 39,419 $ 45,456
Foreign (9,190) (1,074) (1,157)
Income before income taxes $ 24,640 $ 38,345 $ 44,299