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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of Derivative Financial Instruments (Details) - Interest Rate Swap - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Assets |  |
Debt Instrument [Line Items] |  |
Weighted-Average Fixed Rate of Interest at | 1.59% |
Interest rate swaps | $ 9,202,000 | $ 2,147,000
Notional amount of derivative | 1,300,000,000 | 250,000,000
Accounts payable and accrued liabilities |  |
Debt Instrument [Line Items] |  |
Interest rate swaps | 0 | 3,175,000
Notional amount of derivative | $ 0 | $ 750,000

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- 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 + Details
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