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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

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