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Acquisitions (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 15, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Property, plant and equipment $ 250,652   $ 251,029
Intangible assets (1) 16,182   14,420
Total assets $ 422,858   $ 415,547
Big Spring Pipeline [Member]      
Business Acquisition [Line Items]      
Property, plant and equipment   $ 6,443  
Intangible assets (1)   2,560  
Total assets   $ 9,003