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Description of Business and Presentation of Financial Statements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Other Ownership Interests [Line Items]      
Ownership percentage, controlling interest 57.00%    
Shares, Issued 37,250,000    
Limited partner distribution $ 2,500    
Operating Lease, Liability $ 3,944 $ 3,608 $ 78,400
UNEV Pipeline      
Other Ownership Interests [Line Items]      
Equity Method Investment, Ownership Percentage 75.00%    
Frontier Pipeline [Member]      
Other Ownership Interests [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%