Commitments and Contingencies Environmental Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities
Environmental remediation obligations [Member]
Environmental remediation obligation, minimum	$ 21,600
Environmental remediation obligation, maximum	32,700
Accrual for environmental loss contingencies	26,367	$ 26,866	$ 28,895	$ 30,276
Deductions	(2,033)	(2,799)	(2,977)
Charged to costs and expense	1,534	$ 770	$ 1,596
Combined Manufacturing Sites [Member] | Manufactured Gas Plants [Member]
Accrual for environmental loss contingencies	20,500
Aberdeen South Dakota Site [Member] | Manufactured Gas Plants [Member]
Accrual for environmental loss contingencies	7,800
Environmental remediation obligation, to be incurred during next 5 years	$ 2,800