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FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate $ 398,824 $ 409,362
Debt at variable interest rate 693,318 699,704
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate 389,495 395,274
Debt at variable interest rate $ 664,991 $ 658,557