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Income Taxes - Reconciliation of Effective Tax Rate (Details)
0 Months Ended 3 Months Ended 9 Months Ended
Feb. 14, 2008
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]          
Federal statutory tax rate 38.00% 35.00% 35.00% 35.00% 35.00%
State income taxes, net of federal benefit   3.60% 1.10% 3.20% 2.10%
Change in valuation allowance   0.20% (6.90%) (0.10%) (5.10%)
Warrant liability fair value adjustment   0.00% (2.30%) 0.00% (1.90%)
Domestic production activities deduction   (2.30%) (2.80%) (2.40%) (2.50%)
Other   2.10% (1.00%) 1.00% (0.30%)
Effective income tax rate   38.60% 23.10% 36.70% 27.30%