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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Prepaid expenses and other current assets |  |
Debt Instrument [Line Items] |  |
Interest rate swaps | $ 0 | $ 472
Notional amount |  | 250,000
Accounts payable and accrued liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.91% |
Interest rate swaps | $ 2,662 | 0
Notional amount | $ 300,000 |
Other noncurrent liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 2.73% |
Interest rate swaps | $ 74,102 | 45,604
Notional amount | $ 1,550,000 | $ 1,550,000

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