Business Segments 2 (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting [Abstract]
Total utility plant	$ 1,892,280	$ 1,753,766	$ 1,626,004
Other assets	353,842	280,608
Total Assets	$ 2,246,122	$ 2,034,374