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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Preferred Stock, par value $ 0.01 $ 0.01
Preferred Stock, shares authorized 2,000,000 2,000,000
Preferred Stock, shares issued 0 0
Preferred Stock, shares outstanding 0 0
Common Stock, par value $ 0 $ 0
Common Stock, shares authorized 200,000,000 200,000,000
Common Stock, shares issued 52,794,736 52,748,849
Common Stock, shares outstanding 52,794,736 52,748,849