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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Income tax provision $ 12,629 $ 18,133 $ 28,839 $ 35,880
Effective income tax rate (as a percent) 36.50% 36.00% 36.60% 35.80%
Statutory U.S. income tax rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Income taxes paid (refunds), net     $ (4,900) $ 19,100