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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
State income taxes, net of federal tax benefit 4.40% 3.60% 4.00%
Other items (0.10%) 0.40% 0.90%
Effective income tax rate 25.30% 25.00% 25.90%