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Treasury Stock (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Jul. 28, 2011
Treasury Stock (Textual) [Abstract]    
Authorized to repurchase common stock $ 25,000  
Expiration date on repurchase authorizations Sep. 30, 2012  
Common stock acquired, shares 1,657  
Aggregate cost shares of common stock 23,894  
Remaining authorized repurchase amount 26,106  
Additional amount authorized by board of directors   25,000
Authorized to repurchase common stock including additional repurchase   $ 50,000