INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax provision:
Federal	$ (306)	$ (43)
State	1,408	819	$ (20)
Foreign	(992)	806	905
Current income tax provision	110	1,582	885
Deferred income tax benefit
Federal	(5,163)	(3,416)	(5,549)
State	(6,249)	517	(1,100)
Foreign	(3,866)	(351)	(1,719)
Deferred income tax benefit	(15,278)	(3,250)	(8,368)
Income tax benefit	$ (15,168)	$ (1,668)	$ (7,483)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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