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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
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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

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