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Income Taxes - Effective Tax Rate Differs from Statutory United States Federal Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Statutory Rate 35.00% 35.00% 35.00%
Increases (Decreases) in United States Federal Taxes      
State Income Taxes, Net of Federal Income Tax Benefit 2.70% 2.60% 3.10%
Federal Tax Credits (0.50%) (1.80%) (1.70%)
Other, Net (0.90%) (0.10%) (1.60%)
Effective Tax Rate 36.30% 35.70% 34.80%