Assets Held for Sale and Dispositions (Schedule Of Disposal Groups Including Discontinued Operations) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Discontinued Operations And Other Dispositions [Line Items]
Current assets held for sale	$ 7,461	$ 11,167
Non-current assets held for sale	37,327	32,124
Current liabilities related to assets held for sale	2,669	3,263
Non-current liabilities related to assets held for sale	758	974
Regulated Natural Gas Utility Assets [Member]
Discontinued Operations And Other Dispositions [Line Items]
Inventory - gas stored	1,197	2,807
Other current assets	1,334	3,284
Regulatory assets	4,930	5,076
Current assets held for sale	7,461	11,167
Property, plant and equipment, net	35,232	30,267
Regulatory assets and other	2,095	1,857
Non-current assets held for sale	37,327	32,124
Current liabilities related to assets held for sale	2,669	3,263
Regulatory liabilities	509	649
Other long-term liabilities	249	325
Non-current liabilities related to assets held for sale	$ 758	$ 974