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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 5,519,055 $ 5,464,040
Less: Accumulated depreciation (1,607,285) (1,551,855)
Net fixed assets 3,911,770 3,912,185
Crude oil and natural gas pipelines and related assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 2,840,622 2,839,443
Onshore facilities, machinery and equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 269,107 269,245
Onshore facilities, machinery and equipment | Alkali Business    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 675,940 670,880
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 21,056 21,106
Marine vessels    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 1,018,919 1,018,284
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 228,450 227,540
Office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 26,535 23,965
Construction in progress    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 400,840 350,137
Other    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 37,586 $ 43,440