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Stockholder's Equity (Details textual) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Stockholder's Equity (Textual) [Abstract]    
Repurchased shares 0 0
Repurchased shares tax withholding 50,894 28,627
Common stock, repurchased price $ 1,000 $ 679
Shares remain available for repurchase from the announced authorization 53,621