Income Taxes Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Unrecognized tax benefit more likely than not percentage threshold	50.00%
Unrecognized tax benefits that would impact effective tax rate	$ 7,400	$ 24,400
Unrecognized Tax Benefits [Roll Forward]
Unrecognized Tax Benefits at January 1	28,074	30,330	$ 32,049
Gross increases - tax positions in prior period	0	0	0
Gross increases - tax positions in current period	0	0	0
Gross decreases - tax positions in current period	(1,574)	(2,256)	(1,719)
Lapse of statute of limitations	(16,888)	0	0
Unrecognized Tax Benefits at December 31	9,612	28,074	$ 30,330
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	3,000	$ 4,500
IRS Revenue Procedure 2023-15 - safe harbor method of accounting for gas repairs expenditures
Unrecognized Tax Benefits [Roll Forward]
Unrecognized Tax Benefits, Period Increase (Decrease)	500
Income Tax Benefit From Decrease in Unrecognized Tax Benefits	3,200
Expiration of statute of limitations
Unrecognized Tax Benefits [Roll Forward]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	9,400
Lapse of Statute of Limitations
Unrecognized Tax Benefits [Roll Forward]
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 16,900