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Fair Value Measurements - Level 3 (Details) - Level 3
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / bbl
Dec. 31, 2018
USD ($)
$ / bbl
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Fair Value, beginning of period $ 270  
Purchases 502  
Sales (467)  
Recognized gains (losses) recorded in cost of sales (241)  
Unrecognized gains (losses) recorded in cost of sales (88)  
Fair Value, end of period $ (24) $ 270
Crude Oil | Minimum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) | $ / bbl (4.95) (3.25)
Crude Oil | Maximum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) | $ / bbl (3.25) 2.00
Propane and other | Minimum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) | $ / bbl 0.84 0.84
Propane and other | Maximum    
Fair Value Measurements    
Estimated margin (in dollars per barrel) | $ / bbl 15.54 10.50