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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of derivative instruments (Details) - Interest rate swap - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Other Assets
Debt Instrument [Line Items]
Weighted-average fixed rate of interest	1.49%
Interest rate swaps	$ 2,923,000	$ 2,147,000
Notional amount	$ 1,000,000,000	250,000,000
Accounts Payable and Accrued Liabilities
Debt Instrument [Line Items]
Weighted-average fixed rate of interest	1.91%
Interest rate swaps	$ 1,495,000	3,175,000
Notional amount	$ 300,000,000	$ 750,000,000

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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- Definition

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

+ References

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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