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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid expenses and other current assets    
Debt Instrument [Line Items]    
Weighted-average fixed rate of interest (as a percent) 1.34%  
Interest rate swaps $ 472 $ 3,200
Notional amount of derivative 250,000 750,000
Other noncurrent assets    
Debt Instrument [Line Items]    
Interest rate swaps $ 0 8,256
Notional amount of derivative   550,000
Other noncurrent liabilities    
Debt Instrument [Line Items]    
Weighted-average fixed rate of interest (as a percent) 2.57%  
Interest rate swaps $ 45,604 14,601
Notional amount of derivative $ 1,550,000 $ 950,000