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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Net income (loss) $ 27,185 $ (9,549) $ 8,514 $ (26,723)
Weighted-average shares:        
Basic (in shares) 158,151,747 156,843,989 157,922,075 152,338,668
Effect of dilutive securities from stock options and restricted stock awards (in shares) 4,517,934   4,526,818  
Diluted (in shares) 162,669,681 156,843,989 162,448,893 152,338,668
Net income (loss) per share:        
Basic (in dollars per share) $ 0.17 $ (0.06) $ 0.05 $ (0.18)
Diluted (in dollars per share) $ 0.17 $ (0.06) $ 0.05 $ (0.18)