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Income Taxes (Reconciliation of Federal Statutory Income Tax Rate) (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Federal statutory rate 21.00% 21.00%
State income taxes, net of Federal benefit 6.10% 6.80%
Excess tax benefits (2.70%) (8.90%)
Other 0.40% (0.20%)
Effective tax rate 24.80% 18.70%