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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic:        
Net income (loss) available to common stockholders $ (81,837) $ 419,287 $ (100,709) $ 580,809
Weighted average basic number of common shares outstanding 158,011 146,944 156,628 127,458
Basic net income (loss) per share of common share (in dollars per share) $ (0.52) $ 2.85 $ (0.64) $ 4.56
Diluted:        
Net income (loss) available to common stockholders $ (81,837) $ 419,287 $ (100,709) $ 580,809
Weighted average basic number of common shares outstanding 158,011 146,944 156,628 127,458
Common stock equivalent shares representing shares included upon Vesting of restricted shares   1,546   952
Weighted average diluted number of common shares outstanding 158,011 148,490 156,628 128,410
Diluted net income (loss) per share of common stock (in dollars per share) $ (0.52) $ 2.82 $ (0.64) $ 4.52
Common stock equivalents of stock options, restricted shares and warrants not included in the computations of diluted earnings per share of common stock as their effect would have been anti-dilutive due to the net losses (in shares) 14,900 11,700 14,300 19,000