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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income taxes      
Provision for income taxes $ 2,808 $ 7,346  
Effective tax rate (as a percent) 11.80% 12.50%  
Unrecognized tax benefits $ 0   $ 0