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LONG-TERM DEBT - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]      
Weighted average interest rate (as a percent) 5.40%   5.50%
Aggregate market value of debt     $ 6,200,000
Secured Debt | Term Loan Facility due 2026      
Debt Instrument [Line Items]      
Periodic principal payment $ 6,400 $ 5,250