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Fair Value Measurements - Level 3 (Details) - Level 3
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
$ / bbl
Dec. 31, 2019
$ / bbl
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning of period | $ $ (24)  
Purchases | $ (121)  
Sales | $ 497  
Recognized gains (losses) recorded in cost of sales | $ 24  
Fair Value, end of period | $ $ 376  
Minimum    
Fair Value Measurements    
Estimated margin (in dollars per barrel)   0.84
Maximum    
Fair Value Measurements    
Estimated margin (in dollars per barrel)   15.54
Weighted average    
Fair Value Measurements    
Estimated margin (in dollars per barrel)   11.04
Crude Oil | Minimum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) (3.75) (4.95)
Crude Oil | Maximum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) (2.00) (3.25)
Crude Oil | Weighted average    
Fair Value Measurements    
Estimated margin (in dollars per barrel) (3.26) (4.88)