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Investments - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Feb. 01, 2020
White Cliffs      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   3.33%  
Advantage Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method   50.00%  
Delaware Crossing Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method   50.00%  
Capital contributions   $ 16,900  
EPIC Y-Grade      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method   15.00%  
Capital contributions   $ 12,800  
EPIC Crude      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method   30.00%  
Capital contributions   $ 30,000  
EPIC Propane      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method   15.00%  
Capital contributions   $ 1,500  
Saddlehorn      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   20.00%  
Capital contributions $ 160,000    
Payments to Acquire Equity Method Investments, Net 87,000    
Greenfield Member | Saddlehorn      
Schedule of Equity Method Investments [Line Items]      
Capital contributions $ 73,000    
Black Diamond | Saddlehorn      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     10.00%
Magellan and Plains | Saddlehorn      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     30.00%
Black Diamond and Western Midstream | Saddlehorn      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     20.00%