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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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- Definition

Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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