INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 25,100	$ 33,300	$ 37,600
Deferred Tax Assets, Operating Loss Carryforwards	157,202	194,773
Deferred Tax Assets, Valuation Allowance	206,394	216,468
Accumulated deficit	(1,032,876)	(1,010,499)
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	48,100
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	214,700
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	343,000
Income Tax Examination, Penalties and Interest Expense	1,400	1,600	200
Income Tax Examination, Penalties and Interest Accrued	4,900	5,400
Increase (Decrease) in Income Taxes	12,300	7,900	3,000
State income taxes, net of federal benefits, and state tax credits	5,297	720	(4,980)
Change in valuation allowances	(10,074)	(7,727)	(36,057)
Non-deductible stock-based compensation expense	6,355	3,239	$ 5,002
International
Operating Loss Carryforwards [Line Items]
Income Tax Examination, Penalties and Interest Expense	113,300
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 20,400
Restatement Adjustment
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards		206,300
Deferred Tax Assets, Valuation Allowance		(228,000)
State income taxes, net of federal benefits, and state tax credits		2,000
Change in valuation allowances		3,800
Non-deductible stock-based compensation expense		$ 7,300