Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 3,688	$ 310
Derivative Asset, Fair Value, Gross Liability	(1,622)	(310)
Asset Derivatives	2,066	0
Derivative Liability, Fair Value, Gross Liability	(1,622)	(2,380)
Derivative Liability, Fair Value, Gross Asset	1,622	2,380
Liability Derivatives	0	0
Not qualifying or not designated as hedges under accounting rules | Swaps | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	221	1,867
Not qualifying or not designated as hedges under accounting rules | Swaps | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(808)	(608)
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,599	49
Derivative Asset, Fair Value, Gross Liability	(557)	(49)
Asset Derivatives	1,042	0
Derivative Liability, Fair Value, Gross Liability	(557)	(209)
Derivative Liability, Fair Value, Gross Asset	557	209
Liability Derivatives	$ 0	$ 0