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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of derivative instruments (Details) - Interest rate swap - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Other Assets |  |
Debt Instrument [Line Items] |  |
Weighted-Average Fixed Rate of Interest | 1.46% |
Interest rate swaps | $ 2,395,000 | $ 2,147,000
Notional amount | $ 500,000,000 | 250,000,000
Accounts Payable and Accrued Liabilities |  |
Debt Instrument [Line Items] |  |
Weighted-Average Fixed Rate of Interest | 1.67% |
Interest rate swaps | $ 2,479,000 | 3,175,000
Notional amount | $ 800,000,000 | $ 750,000,000

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