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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic:    
Net income (loss) available to common stockholders $ (33,375) $ 114,491
Weighted average basic number of common shares outstanding 16,232 16,204
Basic net income (loss) per share of common share (in dollars per share) $ (2.06) $ 7.07
Diluted:    
Net Income (Loss) Available to Common Stockholders, Diluted $ (33,375) $ 114,491
Net income (loss) available to common stockholders (33,375) 114,491
Net income (loss) diluted $ (33,375) $ 114,491
Weighted average basic number of common shares outstanding 16,232 16,204
Weighted average diluted number of common shares outstanding 16,232 16,204
Diluted net income (loss) per share of common stock (in dollars per share) $ (2.06) $ 7.07
Common stock equivalents excluded from computation of diluted earnings per share of common stock because of anti-dilutive effect 7,800 7,300