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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 Tax Disclosure [Abstract]      
Federal tax expense at statutory rate 34.00% 34.00% 34.00%
State income tax expense (net of federal income tax benefit) 4.00% 5.00% 4.00%
Permanent differences associated with general business credits (3.00%) (1.00%) 5.00%
Other permanent differences 10.00% 1.00% 0.00%
Other 1.00% (2.00%) (1.00%)
Net income tax expense 46.00% 37.00% 42.00%