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FAIR VALUE MEASUREMENTS (Details) - Significant unobservable inputs, Level 3 - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate $ 345,860 $ 345,498
Debt at variable interest rate 320,615 341,300
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt at fixed interest rate 305,375 348,250
Debt at variable interest rate $ 264,507 $ 344,750