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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Prepaid expenses and other current assets |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 1.46% |
Interest rate swaps | $ 950,000 | $ 3,200,000
Notional amount | 500,000,000 | 750,000,000
Other noncurrent assets |  |
Debt Instrument [Line Items] |  |
Interest rate swaps | $ 0 | 8,256,000
Notional amount |  | 550,000,000
Other noncurrent liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-average fixed rate of interest (as a percent) | 2.57% |
Interest rate swaps | $ 55,238,000 | 14,601,000
Notional amount | $ 1,500,000,000.0 | $ 950,000,000

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