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Equity Method Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Mar. 29, 2019
Feb. 15, 2019
Feb. 01, 2019
Dec. 31, 2018
Oct. 31, 2014
Schedule of Equity Method Investments [Line Items]                
Equity method investments $ 187,000,000 $ 187,000,000         $ 1,000,000  
Equity Method Investment, Other than Temporary Impairment   0 $ 0          
HMW Fluid Management LLC [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage               25.00%
EPIC Crude Holdings, LP [Domain]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage           10.00%    
Equity method investments expense related to interest   3,000            
Equity method investments 72,000,000 72,000,000            
Gray Oak Pipeline [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage         10.00%      
Equity method investments expense related to interest   61,000            
Equity method investments 115,000,000 115,000,000            
Gray Oak Pipeline [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity method investment promissory note borrowings during period 23,000,000              
Equity method investment promissory note repayments during period 23,000,000              
Equity method investment promissory note       $ 123,000,000        
Debt Instrument, Interest Rate, Stated Percentage       2.52%        
Subsequent Event [Member] | Gray Oak Pipeline [Member]                
Schedule of Equity Method Investments [Line Items]                
Amount outstanding under equity method investment promissory note $ 0 $ 0