Fixed Assets and Asset Retirement Obligations (Schedule of Reconciliation of Liability for Asset Retirement Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations, beginning balance	$ 254,054	$ 243,370	$ 228,252
Accretion expense	11,311	11,090	12,023
Revisions in timing and estimated costs of AROs	2,581		3,185
Settlements	(2,552)	(406)	(90)
New liabilities incurred	954
Asset retirement obligations, ending balance	$ 266,348	$ 254,054	$ 243,370