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LONG-TERM DEBT AND LINES OF CREDIT - Schedule of derivative instruments (Details) - Interest rate swap - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Other Assets    
Debt Instrument [Line Items]    
Weighted-Average Fixed Rate of Interest 1.46%  
Interest rate swaps $ 3,305,000 $ 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 $ 1,906,000 3,175,000
Notional amount $ 800,000,000 $ 500,000,000