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LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($)	Dec. 31, 2016	May 31, 2016	May 31, 2015
Other Assets
Debt Instrument [Line Items]
Weighted-Average Fixed Rate of Interest at December 31, 2016	1.34%
Interest rate swaps	$ 2,147,000	$ 0	$ 0
Notional amount	$ 250,000,000	0	0
Accounts payable and accrued liabilities
Debt Instrument [Line Items]
Weighted-Average Fixed Rate of Interest at December 31, 2016	1.54%
Interest rate swaps	$ 3,175,000	10,775,000	6,157,000
Notional amount	$ 750,000	$ 750,000	$ 500,000

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

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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=73719730&loc=d3e13433-108611

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