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Stockholders' Equity (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Schedule of information regarding share-based payment arrangements    
Proceeds from stock options exercised      
Excess tax shortfall related to share-based payment arrangements (418) (721)
Intrinsic value of stock options exercised (1)