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Stockholders' Equity (Details 3) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Schedule of information regarding share-based payment arrangements    
Proceeds from stock options exercised      
Tax shortfall related to exercise of stock options and vesting of restricted stock (393) (872)
Intrinsic value of stock options exercised