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Income Taxes (Schedule of Reconciliation of the U.S. Federal Statutory Rate to Effective Tax Rate) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
U.S. federal statutory rate 21.00% 35.00% 21.00% 35.00%
State income taxes 2.50% 1.90% 2.50% 1.80%
Excess tax benefits from stock-based compensation plans (0.00%) (0.00%) (0.00%) (0.50%)
Other 0.40% 0.20% 0.30% 0.20%
Effective tax rate 23.90% 37.10% 23.80% 36.50%