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Income Taxes Effective Tax Rate Reconciliation (Details)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
U.S. federal statutory tax rate 21.00% 35.00%
State income taxes, net of federal tax benefit 0.60% (0.40%)
General business credits (0.70%) (2.10%)
Employee stock-based compensation (12.20%) (5.10%)
Other 1.90% 0.80%
Effective tax rate 10.60% 28.20%