Asset Retirement Obligations Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at January 1,	$ 40,631	$ 45,355	$ 42,449
Accretion expense	1,853	2,233	2,070
Liabilities incurred	0	0	0
Liabilities settled	(4,004)	(2,906)	(4,061)
Revision to cash flows	2,414	(4,051)	4,897
Liability at December 31,	$ 40,894	$ 40,631	$ 45,355