Summary Of Significant Accounting Policies - (Schedule of Operating Revenues) (Parenthetical) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Non-members energy revenues	$ 42,818,000	$ 45,255,000	$ 31,431,000
TEC [Member]
Disaggregation of Revenue [Line Items]
Non-members energy revenues	$ 29,400,000	$ 0	$ 0