Summary Of Significant Accounting Policies (Schedule Of Reduction In Revenues Utilizing Margin Stabilization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Margin Stabilization adjustment	$ 11,614	$ 13,227	$ 7,175