Assets Held for Sale (Schedule Of Disposal Groups Including Discontinued Operations) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets Held for Sale [Abstract]
Inventory - gas stored	$ 592	$ 2,807
Other current assets	1,778	3,284
Regulatory assets	5,008	5,076
Current assets held for sale	7,378	11,167
Property, plant and equipment, net	33,804	30,267
Regulatory assets and other	615	1,857
Non-current assets held for sale	34,419	32,124
Current liabilities related to assets held for sale	3,081	3,263
Regulatory liabilities	529	649
Other long-term liabilities	274	325
Non-current liabilities related to assets held for sale	$ 803	$ 974