Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension cost	$ 200	$ (700)	$ (800)
Regulatory liabilities	252,272	271,706
Regulatory Liabilities	273,646	416,949
Defined contribution plan matching contributions expense	3,000	2,800	2,700
Salary and Wage, Excluding Cost of Good and Service Sold [Abstract]
Stock-based compensation expense	1,500	1,300	1,200
Retiree health care and life insurance benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory liabilities	200	1,200	$ 1,600
Other Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
Regulatory liabilities	$ 42,400	$ 42,200