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General - Major Streams of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 163,103	$ 167,045	$ 422,545	$ 414,344
Alternative revenue programs, net	2,216	1,324	4,984	4,877
Other balancing and memorandum accounts, net	639	1,532	3,637	11,743
Other regulatory mechanisms, net	(438)	(5,441)	(1,284)	(6,355)
Rental income	1,403	1,403	4,067	4,217
Total revenues	$ 166,923	$ 165,863	$ 433,949	$ 428,826

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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