INCOME TAXES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Increase in valuation allowance	$ 140,500,000	$ 310,000,000.0	$ 154,100,000
Unrecognized tax benefits	217,574,000	$ 198,540,000	$ 70,799,000	$ 92,134,000
Unrecognized tax benefit that would impact annual effective tax rate	7,600,000
Significant accrued interest and penalties related to uncertain tax positions	0
Undistributed earnings of non-U.S. subsidiaries	5,800,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,012,800,000
Federal | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	141,700,000
Federal | AMT Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	1,400,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,311,300,000
State | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	88,200,000
State | California Enterprise Zone Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	3,400,000
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	300,100,000
Foreign | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	4,100,000
Maximum | Tax examinations or lapse of applicable statute of limitations
Operating Loss Carryforwards [Line Items]
Reasonably possible decrease in unrecognized tax benefits	$ 5,700,000