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Income Taxes - Reconciliation of Effective Tax Rate (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Federal statutory tax rate 35.00% 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 1.80% 3.60% 2.10% 3.20%
Return to accrual adjustments (4.90%) 1.10% (1.80%) 0.40%
Domestic production activities deduction (1.90%) (2.30%) (2.40%) (2.40%)
Other (0.20%) 1.20% 0.10% 0.50%
Effective income tax rate 29.80% 38.60% 33.00% 36.70%