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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Reconciliation of effective tax rate to the U.S. federal statutory tax rate
A reconciliation of the effective tax rate to the U.S. federal statutory tax rate is as follows:
 
 
Three months ended March 31,
 
 
2013
 
2012
Federal statutory tax rate
 
35.0

%
 
35.0

%
State income taxes, net of federal benefit
 
2.6

 
 
3.0

 
Change in valuation allowance
 
(0.1
)
 
 
(8.9
)
 
Warrant liability fair value adjustment
 

 
 
3.1

 
Domestic production activities deduction
 
(2.4
)
 
 
(2.1
)
 
Other
 
0.2

 
 
0.9

 
Effective income tax rate
 
35.3

%
 
31.0

%