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Acquisitions - Narrative (Details)
$ in Thousands
Mar. 01, 2018
USD ($)
storage_tank
underground_saltwell
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Asset Acquisitions, by Acquisition [Line Items]      
Intangible assets, net   $ 159,446 $ 15,917
Big Spring Pipeline      
Schedule of Asset Acquisitions, by Acquisition [Line Items]      
Consideration transferred $ 170,800    
Number of storage tanks | storage_tank 75    
Number of underground saltwells | underground_saltwell 4    
Assets $ 72,000    
Asset retirement obligations 800    
Business Acquisition, Transaction Costs 400    
Intangible assets, net $ 144,200    
Finite-lived intangible amortization period 20 years