INTEREST EXPENSE AND SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Interest expense on borrowings	$ 8,237	$ 11,288	$ 16,323	$ 16,411
Amortization of deferred origination fees, net	5,210	15,033	18,053	20,892
Other interest expense	2,035	516	3,197	668
Total interest expense	15,482	26,837	37,573	37,971
Income tax payments, net			1,438	32
Total cash paid for interest			14,250	7,943
U.S. Revolving Credit Facility
Debt Instrument [Line Items]
Interest expense on borrowings	3,409	3,801	7,448	7,351
Total cash paid for interest			8,110	6,921
Last Out Term Loans - cash interest
Debt Instrument [Line Items]
Interest expense on borrowings	4,828	3,606	8,875	4,119
Amortization of deferred origination fees, net	1,579	1,479	3,729	2,069
Total cash paid for interest			6,140	1,022
Last Out Term Loans - paid-in-kind interest
Debt Instrument [Line Items]
Interest expense on borrowings	0	3,881	0	4,941
U.S. Revolving Credit Facility - deferred financing fees and commitment fees
Debt Instrument [Line Items]
Amortization of deferred origination fees, net	3,629	8,880	12,664	14,149
United States revolving credit facility contingent consent fee for Amendment 16
Debt Instrument [Line Items]
Amortization of deferred origination fees, net	0	4,674	0	4,674
U.S. Revolving Credit Facility - deferred ticking fee for Amendment 16
Debt Instrument [Line Items]
Amortization of deferred origination fees, net	$ 2	$ 0	$ 1,660	$ 0