INCOME TAXES - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Deferred tax asset		$ 248,200,000	$ 236,700,000
Valuation allowance		209,200,000	131,100,000
Income tax benefit due to the Tax Cuts and Jobs Act	$ 44,800,000
Increase (decrease) in valuation on deferred tax assets		78,100,000	98,400,000
Unrecognized tax benefits		0	0
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax asset		107,000,000.0
Operating loss carryforwards		226,500,000
Tax credit		52,600,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 34,900,000	122,200,000
State and Local Jurisdiction [Member] | California [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		94,900,000
State and Local Jurisdiction [Member] | Other States [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		18,300,000
KWE [Member]
Operating Loss Carryforwards [Line Items]
Foreign partnership investment basis difference		77,100,000	98,300,000
Valuation allowance		$ 72,600,000	$ 98,300,000