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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 5,188,913 $ 5,540,596
Less: Accumulated depreciation (1,238,006) (1,246,121)
Net fixed assets 3,950,907 4,294,475
Crude oil pipelines and natural gas pipelines and related assets    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 2,883,553 2,891,489
Onshore facilities, machinery, and equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 264,208 640,376
Onshore facilities, machinery, and equipment | Alkali Business    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 600,325 591,547
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 18,728 19,864
Marine vessels    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 991,623 979,171
Land, buildings and improvements    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 217,719 238,451
Office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 22,001 22,645
Construction in progress    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost 148,865 115,162
Other    
Property, Plant and Equipment [Line Items]    
Fixed assets, at cost $ 41,891 $ 41,891