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Derivatives (Schedule of Outstanding Derivatives Entered Into to Hedge Inventory or Fixed Price Purchase Commitments) (Details)
bbl in Thousands, MMBTU in Thousands
 3 Months Ended
Mar. 31, 2020
MMBTU
$ / MMBTU
$ / units
$ / bbl
bbl
Designated as hedges under accounting rules | Sell (Short) Contracts | Future | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 19
Weighted average contract price 37.01
Designated as hedges under accounting rules | Buy (Long) Contracts | Future | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 0
Weighted average contract price 0
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Future | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 248
Weighted average contract price 28.54
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Future | Natural Gas  
Derivative [Line Items]  
Contract volume (MMBTU) | MMBTU 90
Weighted average contract price | $ / MMBTU 1.72
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Swap | Natural Gas  
Derivative [Line Items]  
Contract volume (MMBTU) | MMBTU 503
Weighted average contract price 0.37
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Options | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 55
Weighted average premium received/paid 3.71
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Future | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 217
Weighted average contract price 27.89
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Future | Natural Gas  
Derivative [Line Items]  
Contract volume (MMBTU) | MMBTU 545
Weighted average contract price | $ / MMBTU 2.43
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Swap | Natural Gas  
Derivative [Line Items]  
Contract volume (MMBTU) | MMBTU 0
Weighted average contract price | $ / units 0
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Options | Crude Oil  
Derivative [Line Items]  
Contract volumes (bbls/gal) | bbl 10
Weighted average premium received/paid 9.52