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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Accounts payable and accrued liabilities |  |
Debt Instrument [Line Items] |  |
Notional amount |  | $ 300,000
Interest rate swaps | $ 0 | 1,330
Other noncurrent liabilities |  |
Debt Instrument [Line Items] |  |
Notional amount | $ 1,250,000 | 1,250,000
Weighted-average fixed rate of interest (as a percent) | 2.73% |
Interest rate swaps | $ 48,474 | $ 65,490

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