Regulatory Matters - Regulatory Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Regulatory assets, net not earning a return	$ 52,066	$ 84,887
Total regulatory assets, net	143,343	154,621
Less: current regulatory asset, net	16,068	2,629
Net regulatory assets, less current portion	$ 127,275	151,992
Minimum
Regulatory Assets [Line Items]
Estimated service lives of assets	5 years
Maximum
Regulatory Assets [Line Items]
Estimated service lives of assets	75 years
Income tax temporary differences, net
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 43,434	22,420
Postretirement pensions and other medical benefits
Regulatory Assets [Line Items]
Total regulatory assets, net	31,493	62,197
Business combinations debt premium
Regulatory Assets [Line Items]
Total regulatory assets, net	17,396	19,937
Balancing and memorandum accounts, net
Regulatory Assets [Line Items]
Total regulatory assets, net	45,769	38,334
WRA
Regulatory Assets [Line Items]
Total regulatory assets, net	(4,488)	2,588
Other
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 9,739	$ 9,145