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Subsequent Event (Details) (Subsequent Event [Member], USD $)
1 Months Ended 3 Months Ended
Apr. 30, 2013
Mar. 31, 2013
Mar. 31, 2013
Subsequent Event [Member]
     
Subsequent Event (Textual) [Abstract]      
Authorized amount of common stock repurchase   $ 10,000,000  
Expiration date of tender offer     Apr. 22, 2013
Purchase of common stock 1,341,575 1,931,513  
Common stock par value $ 5.00    
Common stock aggregate value $ 6,708,000 $ 10,392,000