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INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator        
Income (loss) - continuing operations $ 78,701 $ (16,561) $ 90,020 $ (300,533)
Less: Income (loss) attributable to noncontrolling interests 594 (291) 737 1,758
Basic net income (loss) attributable to common stockholders - continuing operations 78,107 (16,270) 89,283 (302,291)
Net income (loss) attributable to common stockholders - discontinued operations 0 0 0 382
Basic net income (loss) attributable to common stockholders 78,107 (16,270) 89,283 (301,909)
Diluted net income (loss) attributable to common stockholders - continuing operations 78,107 (16,270) 89,283 (302,291)
Net income (loss) attributable to common stockholders - discontinued operations 0 0 0 382
Diluted net income (loss) attributable to common stockholders 78,107 (16,270) 89,283 (301,909)
Plus: Interest expense from assumed conversion of convertible senior notes 700 0 1,392 0
Net income (loss) attributable to common stockholders plus assumed conversions $ 78,807 $ (16,270) $ 90,675 $ (301,909)
Denominator        
Shares used in computation of basic net income (loss) per share (in shares) 29,567,802 28,751,520 29,282,932 28,535,393
Weighted-average effect of diluted securities        
Shares used in computation of diluted net income (loss) per share (in shares) 33,364,538 28,751,520 32,393,891 28,535,393
Basic net income (loss) per share:        
Continuing operations (in usd per share) $ 2.64 $ (0.57) $ 3.05 $ (10.59)
Discontinued operations (in usd per share) 0 0 0 0.01
Basic net income (loss) per share (in usd per share) 2.64 (0.57) 3.05 (10.58)
Diluted net income (loss) per share:        
Continuing operations (in usd per share) 2.36 (0.57) 2.80 (10.59)
Discontinued operations (in usd per share) 0 0 0 0.01
Diluted net income (loss) per share (in usd per share) $ 2.36 $ (0.57) $ 2.80 $ (10.58)
Convertible senior notes due 2026        
Weighted-average effect of diluted securities        
Dilutive effect of convertible senior notes (in shares) 3,376,400 0 2,308,112 0
Restricted stock units        
Weighted-average effect of diluted securities        
Dilutive effect of share-based payment arrangements (in shares) 351,720 0 712,866 0
Performance share units and other stock-based compensation awards        
Weighted-average effect of diluted securities        
Dilutive effect of share-based payment arrangements (in shares) 68,616 0 89,981 0