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General - Major Streams of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Revenue from contracts with customers $ 147,204 $ 142,163 $ 259,442 $ 247,299
Alternative revenue programs, net 2,656 3,049 2,768 3,553
Other balancing and memorandum accounts, net 1,477 1,629 2,998 10,211
Other regulatory mechanisms, net (416) (1,076) (846) (914)
Rental income 1,320 1,444 2,664 2,814
Total revenues $ 152,241 $ 147,209 $ 267,026 $ 262,963