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EARNINGS (LOSSES) PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Numerator:            
Loss from continuing operations $ (123,296)   $ (420,468)   $ (201,220) $ (389,739)
Income (loss) from discontinued operations 2,293   (72)   9,786 (196)
Net loss (121,003) $ (70,431) (420,540) $ 30,605 (191,434) (389,935)
Adjustment for basic earnings (loss) per share            
Earnings allocated to unvested shareholders (354)   (1,003)   (714) (1,994)
Numerator for basic earnings (loss) per share:            
From continuing operations (123,650)   (421,471)   (201,934) (391,733)
From discontinued operations 2,293   (72)   9,786 (196)
Net income (loss) attributable to parent, basic (121,357)   (421,543)   (192,148) (391,929)
Adjustment for diluted earnings (loss) per share:            
Effect of reallocating undistributed earnings of unvested shareholders 0   0   0 0
Numerator for diluted earnings (loss) per share:            
From continuing operations (123,650)   (421,471)   (201,934) (391,733)
From discontinued operations 2,293   (72)   9,786 (196)
Net income (loss) attributable to parent, diluted $ (121,357)   $ (421,543)   $ (192,148) $ (391,929)
Denominator:            
Denominator for basic earnings (loss) per share – weighted-average shares (in shares) 107,861   108,557   107,738 108,556
Effect of dilutive shares from stock options, restricted stock and performance units (in shares) 0   0   0 0
Denominator for diluted earnings (loss) per share – adjusted weighted-average shares (in shares) 107,861   108,557   107,738 108,556
Basic earnings (loss) per common share:            
Loss from continuing operations (in dollars per share) $ (1.15)   $ (3.88)   $ (1.87) $ (3.61)
Income from discontinued operations (in dollars per share) 0.02   0   0.09 0
Net loss (in dollars per share) (1.13)   (3.88)   (1.78) (3.61)
Diluted earnings (loss) per common share:            
Loss from continuing operations (in dollars per share) (1.15)   (3.88)   (1.87) (3.61)
Income from discontinued operations (in dollars per share) 0.02   0   0.09 0
Net loss (in dollars per share) $ (1.13)   $ (3.88)   $ (1.78) $ (3.61)