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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock based incentive plan, shares 1,567 2,426 564
Issuance of shares in common stock offering 15,000,000    
Offering expenses $ 2,279    
Preferred Stock [Member]
      
Accrued dividends 801    
Common Stock [Member]
      
Issuance of shares in common stock offering 15,000,000    
Offering expenses 2,279    
Additional Paid-In Capital [Member]
      
Stock based incentive plan, shares 1,567 2,426 564
Issuance of shares in common stock offering 15,000,000    
Offering expenses 2,279    
Accumulated Deficit [Member]
      
Stock based incentive plan, shares     564
Accrued dividends $ 801