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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
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