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Income Taxes (Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Tax Disclosure [Abstract]        
U.S. federal statutory rate 35.00% 35.00% 35.00% 35.00%
State income taxes 1.80% 1.80% 1.80% 1.80%
Excess tax benefits from stock-based compensation plans (0.00%) (0.00%) (0.80%) (0.00%)
Other 0.10% 0.20% 0.10% 0.30%
Effective tax rate 36.90% 37.00% 36.10% 37.10%