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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Prepaid expenses and other current assets |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.58% |
Interest rate swaps | $ 582,000 | $ 3,200,000
Notional amount | $ 250,000,000 | 750,000,000
Other noncurrent assets |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.34% |
Interest rate swaps | $ 1,317,000 | 8,256,000
Notional amount | $ 250,000,000 | 550,000,000
Accounts payable and accrued liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 2.09% |
Interest rate swaps | $ 14,617,000 | 0
Notional amount | $ 1,000,000,000 | 0
Other noncurrent liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 2.57% |
Interest rate swaps | $ 49,886,000 | 14,601,000
Notional amount | $ 1,600,000,000 | $ 950,000,000

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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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