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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
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 $ 40,701 $ 65,490