Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Fixed Assets, Net) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 5,521,434	$ 5,440,858
Less: Accumulated depreciation	(1,212,062)	(1,023,825)
Net fixed assets	4,309,372	4,417,033
Crude oil pipelines and natural gas pipelines and related assets
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	2,922,029	2,918,285
Onshore facilities, machinery, and equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	626,492	639,023
Onshore facilities, machinery, and equipment | Alkali Business
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	563,654	533,924
Transportation equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	19,484	20,102
Marine vessels
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	969,432	951,597
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	225,334	222,242
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	20,889	20,505
Construction in progress
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	132,229	94,025
Other
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 41,891	$ 41,155