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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 |

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