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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY [Abstract]    
Common stock, par value per share $ 0.01 $ 0.01
Treasury stock, purchased at cost, shares 1,757,800 287,400
Warrants repurchased, shares   1,312,500