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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]      
Statutory federal income tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal tax benefit 3.60% 3.70% 3.70%
Domestic production activities deduction (3.20%) (4.60%) (2.70%)
Other items (1.60%) 0.50%
Effective income tax rate 35.40% 32.50% 36.50%