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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Income (loss) - continuing operations	$ (3,129)	$ (73,112)	$ 11,319	$ (283,972)
Less: Income (loss) attributable to noncontrolling interests	253	(995)	143	2,049
Basic net income (loss) attributable to common stockholders - continuing operations	(3,382)	(72,117)	11,176	(286,021)
Net income (loss) attributable to common stockholders - discontinued operations	0	0	0	382
Basic net income (loss) attributable to common stockholders	(3,382)	(72,117)	11,176	(285,639)
Diluted net income (loss) attributable to common stockholders - continuing operations	(3,382)	(72,117)	11,176	(286,021)
Net income (loss) attributable to common stockholders - discontinued operations	0	0	0	382
Diluted net income (loss) attributable to common stockholders	$ (3,382)	$ (72,117)	$ 11,176	$ (285,639)
Denominator
Shares used in computation of basic net income (loss) per share (in shares)	29,273,806	28,493,258	29,139,930	28,426,308
Weighted-average effect of diluted securities
Shares used in computation of diluted net income (loss) per share (in shares)	29,273,806	28,493,258	30,120,851	28,426,308
Basic net income (loss) per share:
Continuing operations (in usd per share)	$ (0.12)	$ (2.53)	$ 0.38	$ (10.06)
Discontinued operations (in usd per share)	0	0	0	0.01
Basic net income (loss) per share (in usd per share)	(0.12)	(2.53)	0.38	(10.05)
Diluted net income (loss) per share:
Continuing operations (in usd per share)	(0.12)	(2.53)	0.37	(10.06)
Discontinued operations (in usd per share)	0	0	0	0.01
Diluted net income (loss) per share (in usd per share)	$ (0.12)	$ (2.53)	$ 0.37	$ (10.05)
Restricted stock units
Weighted-average effect of diluted securities
Dilutive effect of share-based payment arrangements (in shares)	0	0	893,440	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)	0	0	87,481	0

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