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Income Taxes - Reconciliation of Effective Tax Rate (Details)
0 Months Ended 3 Months Ended
Feb. 14, 2008
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 38.00% 35.00% 35.00%
State income taxes, net of federal benefit   2.60% 3.00%
Change in valuation allowance   (0.10%) (8.90%)
Warrant liability fair value adjustment   0.00% 3.10%
Domestic production activities deduction   (2.40%) (2.10%)
Other   0.20% 0.90%
Effective income tax rate   35.30% 31.00%