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Income Taxes (Reconciliation of Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal statutory rate (percent) 34.00% 34.00% 34.00%
State taxes, net of federal benefit (percent) 1.20% 3.50% 3.50%
Tax credits (percent) (0.10%) (0.20%) (1.10%)
Effect of foreign operations (percent) 1.10% (2.20%) 0.10%
Stock compensation (percent) (1.70%) (2.90%) 0.00%
Permanent items and other (percent) (1.60%) (3.30%) (1.70%)
Tax carryforwards not benefited (percent) (45.70%) (37.10%) (34.40%)
Effective tax rate (percent) (12.80%) (8.20%) 0.40%