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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of Derivative Instruments (Details) - Interest rate swap - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Prepaid expenses and other current assets    
Debt Instrument [Line Items]    
Weighted-average fixed rate of interest 1.52%  
Interest rate swaps $ 2,722,000 $ 0
Notional amount $ 500,000,000 0
Other noncurrent assets    
Debt Instrument [Line Items]    
Weighted-average fixed rate of interest 1.63%  
Interest rate swaps $ 13,998,000 9,202,000
Notional amount $ 800,000,000 $ 1,300,000,000