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LOSS PER SHARE (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
LOSS PER SHARE                              
Discount on share price (as a percent) 50.00%                       50.00%    
Adjustments to weighted average number of common shares and loss per common share                              
Weighted average number of common shares                         261,223 147,692 132,633
Loss per common share (in dollars per share)                         $ 0.26 $ 0.42 $ 0.25
Net loss for the year $ 26,285 $ 2,654 $ 20,364 $ 17,351 $ 16,304 $ 23,680 $ 13,154 $ 8,734 $ 7,348 $ 8,170 $ 10,703 $ 6,870 $ 66,654 $ 61,872 $ 33,091
Reported
                              
Adjustments to weighted average number of common shares and loss per common share                              
Weighted average number of common shares                           137,046 121,987
Loss per common share (in dollars per share)                           $ 0.45 $ 0.27
Net loss for the year 26,285 2,583 21,251 19,202                      
Adjustment
                              
Adjustments to weighted average number of common shares and loss per common share                              
Weighted average number of common shares                           10,646 10,646
Loss per common share (in dollars per share)                           $ (0.03) $ (0.02)
Net loss for the year   $ 71 $ (887) $ (1,851)