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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic:        
Net income (loss) $ (640,844) $ (16,274) $ (977,403) $ (18,872)
Weighted average basic number of common shares outstanding 159,050 157,943 158,801 155,925
Basic net income (loss) per share of common share (in dollars per share) $ (4.03) $ (0.10) $ (6.15) $ (0.12)
Diluted:        
Net income (loss) $ (640,844) $ (16,274) $ (977,403) $ (18,872)
Weighted average basic number of common shares outstanding 159,050 157,943 158,801 155,925
Weighted average diluted number of common shares outstanding 159,050 157,943 158,801 155,925
Diluted net income (loss) per share of common stock (in dollars per share) $ (4.03) $ (0.10) $ (6.15) $ (0.12)
Common stock equivalents excluded from computation of diluted earnings per share of common stock because of anti-dilutive effect 15,700 14,900 15,300 14,000