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LOSS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
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, 2013
Dec. 31, 2012
Dec. 31, 2011
LOSS PER SHARE                              
Net loss for the year $ (11,343) $ 3,264 $ (128,681) $ (10,982) $ (26,285) $ (2,654) $ (20,364) $ (17,351) $ (16,304) $ (23,680) $ (13,154) $ (8,734) $ (147,742) $ (66,654) $ (61,872)
Weighted average number of common shares 297,159,000 297,125,000 297,097,000 296,778,000                 297,041,000 261,223,000 147,692,000
Loss per common share (in dollars per share) $ (0.04) $ 0.01 $ (0.43) $ (0.04)                 $ (0.50) $ (0.26) $ (0.42)
Options
                              
Antidilutive Securities Excluded from Computation of Earnings Per Share                              
Average exercise price of options outstanding (in dollars per share) $ 5.04       $ 6.32       $ 7.15       $ 5.04 $ 6.32 $ 7.15
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)                         2,100,000 1,600,000 1,100,000
Other options
                              
Antidilutive Securities Excluded from Computation of Earnings Per Share                              
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)                         3,600,000 2,900,000 5,000,000