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FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate $ 375,950 $ 375,789
Debt at variable interest rate 710,999 672,618
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate 108,523 195,189
Debt at variable interest rate $ 232,139 $ 351,856