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Acquisitions - Narrative (Details)
$ in Thousands
Mar. 01, 2018
USD ($)
storage_tank
underground_saltwell
Sep. 15, 2017
USD ($)
mi
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Asset Acquisitions, by Acquisition [Line Items]        
Property, plant and equipment     $ 314,670 $ 255,068
Intangible assets, net     155,840 15,917
Total     $ 693,569 $ 443,530
Big Spring Logistic Assets        
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      
Excess cash paid over book value $ 98,800      
Assets 72,000      
Asset retirement obligations 800      
Business Acquisition, Transaction Costs 400      
Intangible assets, net $ 144,200      
Big Spring Pipeline        
Schedule of Asset Acquisitions, by Acquisition [Line Items]        
Length of pipeline (in miles) | mi   40    
Consideration transferred   $ 9,000    
Finite-lived intangible amortization period 20 years      
Property, plant and equipment   6,443    
Intangible assets, net [1]   2,560    
Total   $ 9,003    
[1] Intangible assets acquired represent rights-of-way assets with indefinite useful lives. Rights-of-way assets are not subject to amortization.