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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Percent        
U.S. federal statutory income tax rate   35.00% 35.00% 35.00%
State taxes, net of federal benefit   1.80% 1.80% 1.80%
Decrease in valuation allowance   0.00% 0.00% (0.20%)
Foreign tax rate differential   (2.20%) (2.00%) 0.00%
Tax Cuts and Jobs Act adjustment 2.60% 2.60% 0.00% 0.00%
Other   0.00% (0.70%) 0.20%
Effective income tax rate   37.20% 34.10% 36.80%