v3.26.1
Fixed Assets and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 5,392,151,000 $ 5,374,060,000
Less: Accumulated depreciation (1,990,293,000) (1,908,737,000)
Net fixed assets 3,401,858,000 3,465,323,000
Crude oil and natural gas pipelines and related assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 3,844,017,000 3,845,631,000
Onshore facilities, machinery and equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 295,229,000 291,896,000
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 24,281,000 24,026,000
Marine vessels    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 1,076,826,000 1,073,262,000
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 88,899,000 88,629,000
Office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 12,471,000 10,317,000
Construction in progress    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 24,531,000 13,634,000
Other    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 25,897,000 $ 26,665,000