Fair Value Measurements And Derivative Instruments (Narrative) (Details 3) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Commodity derivative contracts
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 19,500,000	$ 61,300,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0
Derivative Instruments Not Designated as Hedging Instruments, Gain		400,000
Asset Derivatives	$ 8,500,000
Liability Derivatives		$ (2,200,000)
Minimum [Member]
Derivatives, Fair Value [Line Items]
Term Of Contract	3 years
Maximum [Member]
Derivatives, Fair Value [Line Items]
Term Of Contract	5 years