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Income Taxes (Reconciliation Of Statutory Federal Tax Rate) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal income tax at statutory rate 35.00% 34.50% 34.50%
State and local taxes, net of federal benefit 5.20% 5.20% 5.90%
Jobs tax credits, net (15.80%) (11.10%) (9.90%)
Nondeductible permanent items 0.90% 0.50% 0.50%
Other (0.20%) (3.40%) 0.20%
Effective income tax rate 25.10% 25.70% 31.20%