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Stock Repurchase Program (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Repurchase Program (Textual) [Abstract]      
Cost of repurchase 1,200,000    
Repurchased shares 0 339,384 266,672
Weighted average price $ 0.00 $ 14.08 $ 12.79