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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt $ (14,120) $ (13,750)
Long-term debt, net of current portion (1,980,579) (1,979,469)
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt (14,120) (13,750)
Long-term debt, net of current portion (1,980,579) (1,979,469)
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion of long-term debt (14,199) (13,802)
Long-term debt, net of current portion $ (2,211,769) $ (2,168,108)