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General - Major Streams of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accounting Policies [Abstract]        
Revenue from contracts with customers $ 169,972 $ 163,103 $ 440,406 $ 422,545
Alternative revenue programs, net 3,172 2,216 (1,737) 4,984
Other balancing and memorandum accounts, net 1,857 639 6,719 3,637
Other regulatory mechanisms, net (494) (438) (260) (1,284)
Rental income 1,474 1,403 4,196 4,067
Total revenues $ 175,981 $ 166,923 $ 449,324 $ 433,949