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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic:        
Net income (loss) $ 13,052 $ (153,125) $ (54,252) $ (165,950)
Weighted average basic number of common shares outstanding 16,270 16,204 16,257 16,204
Basic net income (loss) per share of common share (in dollars per share) $ 0.80 $ (9.45) $ (3.34) $ (10.24)
Diluted:        
Net income (loss) $ 13,052 $ (153,125) $ (54,252) $ (165,950)
Weighted average basic number of common shares outstanding 16,270 16,204 16,257 16,204
Vesting of restricted stock units 158      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7,400 7,800 7,700 7,600
Weighted average diluted number of common shares outstanding 16,428 16,204 16,257 16,204
Diluted net income (loss) per share of common stock (in dollars per share) $ 0.79 $ (9.45) $ (3.34) $ (10.24)
Common stock equivalents excluded from computation of diluted earnings per share of common stock because of anti-dilutive effect 7,400 7,800 7,700 7,600