INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Income Tax Examination [Line Items]
Reduction in deferred tax liability, recorded as income tax benefit			$ 10,000
Expense for the transition tax			$ 24,000
Undistributed foreign earnings		$ 813,000
Undistributed earnings of foreign subsidiaries, included in transition tax		635,000
Net operating loss carryforwards		381,585		$ 619,314
Net operating loss carryforwards, indefinite carryforward period		30,000
Valuation allowance		41,153		$ 17,577
Unrecognized tax benefits that would affect the effective tax rate in future periods		39,000
Decrease in unrecognized tax benefits related to federal, state and foreign tax positions		6,000
Domestic
Income Tax Examination [Line Items]
Net operating loss carryforwards		311,000
Net operating loss carryforwards, expected to expire		8,000
State and Local
Income Tax Examination [Line Items]
Net operating loss carryforwards, expected to expire		72,000
Net operating loss carryforwards, expiring in 2021		4,000
Net operating loss carryforwards, expiring in 2022		400
Net operating loss carryforwards, expiring in 2023		63,000
Foreign
Income Tax Examination [Line Items]
Change in valuation allowance	$ 13,000	$ 24,000