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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
U.S. federal statutory income tax (benefit) rate 21.00% 21.00% 21.00% 21.00%
U.S. state income taxes (benefit), net of federal income tax effect 2.00% 12.00% 1.00% (6.00%)
Excess tax benefits from stock compensation 0.00% 3.00% 0.00% (4.00%)
Foreign tax rate differences and financing structure 0.00% (4.00%) 1.00% 5.00%
Research and development and other tax credits (7.00%) 16.00% (6.00%) (15.00%)
Uncertain income tax positions 1.00% (3.00%) (1.00%) 3.00%
U.S. taxes on foreign earnings 0.00% (9.00%) 1.00% 14.00%
Other differences - net 2.00% 1.00% 1.00% (4.00%)
Effective income tax (benefit) rate 19.00% 37.00% 18.00% 14.00%