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Summary of Significant Accounting Policies - Concentration Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]    
Revenues $ 114,976 $ 266,845
Plains Marketing L.P.    
Concentration Risk [Line Items]    
Revenues $ 40,058 $ 69,214
Plains Marketing L.P. | Revenue Benchmark    
Concentration Risk [Line Items]    
Concentration risk percentage 34.80% 25.90%
Targa Pipeline Mid-Continent West OK LLC    
Concentration Risk [Line Items]    
Revenues $ 38,287 $ 85,780
Targa Pipeline Mid-Continent West OK LLC | Revenue Benchmark    
Concentration Risk [Line Items]    
Concentration risk percentage 33.30% 32.10%
Sinclair Crude Company    
Concentration Risk [Line Items]    
Revenues $ 36,375 $ 74,810
Sinclair Crude Company | Revenue Benchmark    
Concentration Risk [Line Items]    
Concentration risk percentage 31.60% 28.00%