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Description of Business and Presentation of Financial Statements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Jan. 01, 2019
Other Ownership Interests [Line Items]        
Ownership percentage, controlling interest 57.00% 57.00%    
Shares, Issued 37,250,000 37,250,000    
Limited partner distribution   $ 2,500    
Revenue, Remaining Performance Obligation, Amount $ 17,600      
Property, Plant, and Equipment, Salvage Value 88,500 88,500    
Long-Lived Assets 28,100 28,100    
Goodwill, Gross 68,700 68,700    
Operating Lease, Liability $ 3,743 $ 3,743 $ 3,608 $ 78,400
UNEV Pipeline        
Other Ownership Interests [Line Items]        
Equity Method Investment, Ownership Percentage 75.00% 75.00%    
Frontier Pipeline [Member]        
Other Ownership Interests [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%