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Store Closing Costs (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Store
Store Closing Costs (Textual) [Abstract]  
Number of Stores 407
Q2 [Member]
 
Store Closing Costs (Textual) [Abstract]  
Number of Stores 2
Expense related to the closure of underperforming stores $ 0.7
Q3 [Member]
 
Store Closing Costs (Textual) [Abstract]  
Number of Stores 1
Expense related to the closure of underperforming stores $ 0.4