Contingencies - Litigation (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Potential liabilities related to litigation and environmental matters	$ 22,900	$ 22,500	$ 23,400
Loss contingency, receivable	80	202	2,000
Loss contingency, regulatory asset	$ 21,600	$ 21,600	$ 20,900