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Treasury Stock (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jul. 28, 2011
Treasury Stock (Additional Textual) [Abstract]    
Aggregate cost shares of common stock $ 1,978  
Treasury Stock (Textual) [Abstract]    
Authorized to repurchase common stock 25,000  
Expiration date on repurchase authorizations Sep. 30, 2013  
Common stock acquired, shares 1,777  
Remaining authorized repurchase amount 24,128  
Shares repurchased during the period 120  
Additional amount authorized by board of directors   25,000
Authorized to repurchase common stock including additional repurchase   50,000
Common Stock [Member]
    
Treasury Stock (Additional Textual) [Abstract]    
Aggregate cost shares of common stock $ 25,872