INDEBTEDNESS - Estimated Fair Values of Debt Obligations (Details) - Senior Notes $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Total debt instruments	$ 1,285,579
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	1,285,579
First lien term loan
Debt Instrument [Line Items]
Total debt instruments	892,499
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	892,499
Second lien notes
Debt Instrument [Line Items]
Total debt instruments	393,080
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	393,080
Markets for Identical Item (Level 1)
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	0
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]
Total debt instruments, end of period	0
Markets for Identical Item (Level 1) | Second lien notes
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	0
Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Total debt instruments	775,058
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	775,058
Significant Other Observable Inputs (Level 2) | First lien term loan
Debt Instrument [Line Items]
Total debt instruments	775,058
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	775,058
Significant Other Observable Inputs (Level 2) | Second lien notes
Debt Instrument [Line Items]
Total debt instruments	0
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	0
Significant Unobservable Inputs (Level 3)
Debt Instrument [Line Items]
Total debt instruments	339,371
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, end of period	339,371
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]
Total debt instruments, end of period	0
Significant Unobservable Inputs (Level 3) | Second lien notes
Debt Instrument [Line Items]
Total debt instruments	339,371
Debt Instrument, Changes In Long-Term Debt [Roll Forward]
Total debt instruments, beginning of period	411,119
Change in fair value	(71,748)
Total debt instruments, end of period	$ 339,371