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Income Taxes - Effective Tax Rates (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Federal provision (as a percent) 21.00% 35.00% 21.00% 35.00%
State provision (as a percent) 1.50% 3.20% 1.50% 3.20%
International provision (as a percent) 8.50% 2.90% 7.80% 3.70%
Permanent items (as a percent) (0.50%) 0.30% (0.10%) 0.40%
Other (as a percent) (1.00%) 0.10% (1.10%) 0.50%
Effective rate (as a percent) 29.50% 41.50% 29.10% 42.80%