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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid expenses and other current assets
Debt Instrument [Line Items]
Notional amount of derivative		$ 250,000
Interest rate swaps	$ 0	472
AP & accrued liabilities
Debt Instrument [Line Items]
Notional amount of derivative	$ 300,000
Weighted-average fixed rate of interest (as a percent)	1.91%
Interest rate swaps	$ 1,330	0
Other noncurrent liabilities
Debt Instrument [Line Items]
Notional amount of derivative	$ 1,250,000	1,550,000
Weighted-average fixed rate of interest (as a percent)	2.73%
Interest rate swaps	$ 65,490	$ 45,604

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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=121590274&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=121590274&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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