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Asset Impairment Charge (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2011
days
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Asset Impairment Charges [Abstract]          
Supplier contract termination notice period 24        
Asset impairment charges   $ 0 $ 2,500 $ 2,500 $ 0