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FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate $ 337,368 $ 336,000
Debt at variable interest rate 726,802 612,727
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate 276,500 213,500
Debt at variable interest rate $ 595,591 $ 397,601