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ACQUISITIONS - Purchase Price Allocation to Tangible and Intangible Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Aug. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 1,004,545 $ 1,004,545  
Indianola Pipeline      
Business Acquisition [Line Items]      
Inventories     $ 1,554
Property, plant and equipment     16,713
Goodwill     7,758
Allocated purchase price     $ 26,025