Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Oct. 31, 2012
Common Stock
Dec. 31, 2012
Common Stock
Dec. 31, 2011
Common Stock
May 31, 2012
Common Stock
Preferred Stock              
Preferred stock, shares authorized 10,000,000 10,000,000          
Common Stock              
Authorized number of shares of common stock 200,000,000 200,000,000         200,000,000
Number of shares of common stock sold       15,237,750 15,237,750 18,745,000  
Common stock issue price (in dollars per share) $ 9.50 $ 8.00   $ 9.50      
Net proceeds from public offering after deducting underwriting discounts and commissions and offering expenses $ 139,094 $ 142,779 $ 1,964 $ 135,700