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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income before income taxes      
Federal $ 45,456 $ 57,950 $ 54,872
Foreign (1,157) 0 0
Income before income taxes $ 44,299 $ 57,950 $ 54,872