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LONG-TERM DEBT AND LINES OF CREDIT - Derivative Instruments (Details) - Interest rate swap - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Prepaid expenses and other current assets
Debt Instrument [Line Items]
Weighted-average fixed rate of interest (as a percent)	1.58%
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

X

- 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

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- Definition

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+ References

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- Definition

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+ References

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