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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
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

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

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

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