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Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Effective tax rate, percentage 28.80% 34.30%  
Total amount of uncertain tax positions $ 37,813   $ 37,813
Unrecognized tax benefits that would impact effective tax rate 29,376   29,376
Accrued interest liability 728   $ 644
Accrued interest expense $ 84