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Income Taxes (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Effective tax rate (as a percent) 20.00% 30.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent 7.00% 3.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 4.00%  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 2.00%  
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent   2.00%