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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of Derivative Instruments (Details) - Interest rate swap - USD ($) | Jun. 30, 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 | $ 2,544,000 | $ 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 | $ 16,003,000 | 9,202,000
Notional amount | $ 800,000,000 | $ 1,300,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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