Contingencies - Litigation (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Potential liabilities related to litigation and environmental matters	$ 23,600	$ 22,500	$ 20,900
Loss contingency, receivable	975	202	338
Loss contingency, regulatory asset	$ 21,500	$ 21,600	$ 20,500