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FINANCIAL INSTRUMENTS - Quantitative Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financial Instruments    
Fair value of derivative - current assets $ 3,308 $ 70
Fair value of derivative - noncurrent assets 12,295 6,020
Fair value of derivative - current liabilities   (852)
Derivatives designated as hedging instruments | Interest rate swap    
Financial Instruments    
Fair value of derivative - current assets 3,308 70
Fair value of derivative - noncurrent assets 12,295 6,020
Fair value of derivative - current liabilities   (852)
Total derivatives designated as hedging instruments, net $ 15,603 $ 5,238