Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation between the United States, or the U.S, statutory federal income tax rate and effective income tax rate    
US statutory federal income tax rate 34.00% 34.00%
State taxes, net of US federal income tax benefit 21.40% 10.20%
Other adjustments 0.10% 1.60%
Effective tax rate 55.50% 45.80%