Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 1)

v2.4.0.6
Income Taxes (Details 1)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of the statutory federal income tax rate with Sonic's federal and state overall effective income tax rate from continuing operations      
Statutory federal rate 35.00% 35.00% 35.00%
Effective state income tax rate 4.22% 3.92% 4.70%
Valuation allowance adjustments (3.15%)    (58.69%)
Other (0.69%) (0.10%) 0.01%
Effective tax rate 35.38% 38.82% (18.98%)