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Income Taxes (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation, Percent 14.50% 31.30%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent (14.50%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent (2.60%)  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%