INDEBTEDNESS - Summary of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal Amount	$ 1,156,919	$ 1,161,531
Discount	(8,731)	(13,355)
Debt Issuance Costs	(18,590)	(23,823)
Net Balance	1,129,598	1,124,353
Less: current portion	(11,775)	(9,250)
Total long-term debt	1,117,823	1,115,103
Senior Notes \| First lien term loan
Debt Instrument [Line Items]
Principal Amount	1,156,919	915,750
Discount	(8,731)	(7,253)
Debt Issuance Costs	(18,590)	(19,710)
Net Balance	1,129,598	888,787
Senior Notes \| Second lien notes
Debt Instrument [Line Items]
Principal Amount	0	245,781
Discount	0	(6,102)
Debt Issuance Costs	0	(4,113)
Net Balance	0	235,566
Senior Notes \| Asset-based-lending (“ABL”) facility
Debt Instrument [Line Items]
Principal Amount	0	0
Discount	0	0
Debt Issuance Costs	0	0
Net Balance	$ 0	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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