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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