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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid expenses and other current assets |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.54% |
Interest rate swaps | $ 3,200 | $ 0
Notional amount of derivative | $ 750,000 |
Other noncurrent assets |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.65% |
Interest rate swaps | $ 8,256 | 9,202
Notional amount of derivative | $ 550,000 | 1,300,000
Accounts payable and accrued liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 2.82% |
Interest rate swaps | $ 14,601 | $ 0
Notional amount of derivative | $ 950,000 |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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