Fixed Assets and Asset Retirement Obligations (Schedule of Reconciliation of Liability for Asset Retirement Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning balance	$ 228,573	$ 220,906	$ 176,852
Accretion expense	12,040	13,092	10,038
Revisions in timing and estimated costs of AROs	3,185	11,216	35,735
Acquisitions			3,008
Settlements	(90)	(16,641)	(4,727)
Asset retirement obligations, ending balance	$ 243,708	$ 228,573	$ 220,906