Derivatives (Schedule of Outstanding Derivatives Entered Into to Hedge Inventory or Fixed Price Purchase Commitments) (Details) - 9 months ended Sep. 30, 2023 gal in Thousands, bbl in Thousands, T in Thousands, MMBTU in Thousands	bbl	$ / bbl	MMBTU	$ / MMBTU	T	$ / T	gal	$ / gal
Designated as hedges under accounting rules | Sell (Short) Contracts | Future | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	398
Weighted average contract price | $ / bbl		80.23
Designated as hedges under accounting rules | Buy (Long) Contracts | Future | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	192
Weighted average contract price | $ / bbl		82.51
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Future | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	59
Weighted average contract price | $ / bbl		84.75
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Future | Natural Gas
Derivative [Line Items]
Contract volumes (bbls)	59
Contract volume (MMBTU) | MMBTU			180
Weighted average contract price		0.66		2.71
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Future | Fuel Oil
Derivative [Line Items]
Contract volumes (MT) | T					0
Weighted average contract price (MT) | $ / T						0
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Swaps | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU			0
Weighted average contract price | $ / MMBTU				0
Not qualifying or not designated as hedges under accounting rules | Sell (Short) Contracts | Commodity Option | Natural Gas and Natural Gas Liquids
Derivative [Line Items]
Contract volumes (bbls) | gal							0
Weighted average contract price | $ / gal								0
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Future | Crude Oil
Derivative [Line Items]
Contract volumes (bbls)	33
Weighted average contract price | $ / bbl		90.34
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Future | Natural Gas
Derivative [Line Items]
Contract volumes (bbls)	32
Contract volume (MMBTU) | MMBTU			1,294
Weighted average contract price		0.17		3.66
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Future | Fuel Oil
Derivative [Line Items]
Contract volumes (MT) | T					51,500
Weighted average contract price (MT) | $ / T						535.99
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Swaps | Natural Gas
Derivative [Line Items]
Contract volume (MMBTU) | MMBTU			1,261
Weighted average contract price | $ / MMBTU				0.62
Not qualifying or not designated as hedges under accounting rules | Buy (Long) Contracts | Commodity Option | Natural Gas and Natural Gas Liquids
Derivative [Line Items]
Contract volumes (bbls) | gal							1,050
Weighted average contract price | $ / gal								0.27