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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]          
Provision (benefit) for income taxes, as a percentage of income before income taxes 34.70% 24.70% 43.10% 19.50%  
Statutory U.S. federal income tax rate     35.00% 35.00%  
Liability related to unrecognized tax benefits $ 7,811   $ 7,811   $ 7,809