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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Prepaid expenses and other current assets |  |
Debt Instrument [Line Items] |  |
Notional amount of derivative |  | $ 250,000
Interest rate swaps | $ 0 | 472
AP & accrued liabilities |  |
Debt Instrument [Line Items] |  |
Notional amount of derivative | $ 300,000 |
Weighted-average fixed rate of interest (as a percent) | 1.91% |
Interest rate swaps | $ 1,330 | 0
Other noncurrent liabilities |  |
Debt Instrument [Line Items] |  |
Notional amount of derivative | $ 1,250,000 | 1,550,000
Weighted-average fixed rate of interest (as a percent) | 2.73% |
Interest rate swaps | $ 65,490 | $ 45,604

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