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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 5,209,403 $ 5,540,596
Less: Accumulated depreciation (1,295,654) (1,246,121)
Net fixed assets 3,913,749 4,294,475
Crude oil pipelines and natural gas pipelines and related assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 2,880,802 2,891,489
Onshore facilities, machinery, and equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 264,763 640,376
Onshore facilities, machinery, and equipment | Alkali Business    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 614,403 591,547
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 19,336 19,864
Marine vessels    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 993,346 979,171
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 217,770 238,451
Office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 21,993 22,645
Construction in progress    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 155,099 115,162
Other    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 41,891 $ 41,891