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Income Taxes (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Effective income tax rate 29.00% 45.00%  
U.S. Federal statutory rate 21.00% 35.00%  
Excess tax benefits on share-based compensation $ 1,000 $ 3,600  
Deferred tax assets $ 15,730   $ 20,076