Fixed Assets and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 5,382,525,000	$ 5,374,060,000
Less: Accumulated depreciation	(1,951,203,000)	(1,908,737,000)
Net fixed assets	3,431,322,000	3,465,323,000
Crude oil and natural gas pipelines and related assets
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	3,850,816,000	3,845,631,000
Onshore facilities, machinery and equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	291,756,000	291,896,000
Transportation equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	23,937,000	24,026,000
Marine vessels
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	1,069,577,000	1,073,262,000
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	88,629,000	88,629,000
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	10,403,000	10,317,000
Construction in progress
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	21,510,000	13,634,000
Other
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 25,897,000	$ 26,665,000