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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, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Numerator:            
Income (loss) from continuing operations $ (420,468)   $ 71,857   $ (389,739) $ 80,221
Loss from discontinued operations (72)   (10,966)   (196) (371)
Net income (loss) (420,540) $ 30,605 60,891 $ 18,959 (389,935) 79,850
Adjustment for basic earnings per share            
Earnings allocated to unvested shareholders (1,003)   (784)   (1,994) (1,560)
Numerator for basic earnings (loss) per share:            
From continuing operations (421,471)   71,073   (391,733) 78,661
From discontinued operations (72)   (10,966)   (196) (371)
Net income (loss) attributable to parent, basic (421,543)   60,107   (391,929) 78,290
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 (421,471)   71,073   (391,733) 78,661
From discontinued operations (72)   (10,966)   (196) (371)
Net income (loss) attributable to parent, diluted $ (421,543)   $ 60,107   $ (391,929) $ 78,290
Denominator:            
Denominator for basic earnings per share – weighted-average shares (in shares) 108,557   109,406   108,556 109,273
Effect of dilutive shares from stock options, restricted stock and performance share units (in shares) 0   97   0 179
Denominator for diluted earnings per share – adjusted weighted-average shares (in shares) 108,557   109,503   108,556 109,452
Basic earnings (loss) per common share:            
Income (loss) from continuing operations (in dollars per share) $ (3.88)   $ 0.65   $ (3.61) $ 0.72
Loss from discontinued operations (in dollars per share) 0   (0.10)   0 0
Net income (loss) (in dollars per share) (3.88)   0.55   (3.61) 0.72
Diluted earnings (loss) per common share:            
Income (loss) from continuing operations (in dollars per share) (3.88)   0.65   (3.61) 0.72
Loss from discontinued operations (in dollars per share) 0   (0.10)   0 0
Net income (loss) (in dollars per share) $ (3.88)   $ 0.55   $ (3.61) $ 0.72