INDEBTEDNESS - Estimated Fair Values of Debt Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt instruments	$ 1,065,900
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Principal prepayment	(8,832)	$ (9,250)	$ (2,075)
Second Lien Notes fair value as of December 31, 2021	1,065,900
Markets for Identical Item (Level 1)
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Total debt instruments	1,099,750
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	1,099,750
Significant Unobservable Inputs (Level 3)
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Senior Notes
Debt Instrument [Line Items]
Total debt instruments	488,836
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	488,836
Senior Notes | First Lien Term Loan
Debt Instrument [Line Items]
Total debt instruments	577,064
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	577,064
Senior Notes | Markets for Identical Item (Level 1)
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Senior Notes | Markets for Identical Item (Level 1) | First Lien Term Loan
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Senior Notes | Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Total debt instruments	501,250
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	501,250
Senior Notes | Significant Other Observable Inputs (Level 2) | First Lien Term Loan
Debt Instrument [Line Items]
Total debt instruments	598,500
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	598,500
Senior Notes | Significant Unobservable Inputs (Level 3)
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Senior Notes | Significant Unobservable Inputs (Level 3) | First Lien Term Loan
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of December 31, 2021	0
Senior Notes | Significant Unobservable Inputs (Level 3) | Second Lien Notes
Debt Instrument [Line Items]
Total debt instruments	0	266,438
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Second Lien Notes fair value as of January 1, 2021	266,438
Principal prepayment	(245,781)
Change in fair value	(20,657)
Second Lien Notes fair value as of December 31, 2021	$ 0	$ 266,438