Fixed Assets and Asset Retirement Obligations (Schedule of Fixed Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 5,540,596	$ 5,440,858
Less: Accumulated depreciation	(1,246,121)	(1,023,825)
Net fixed assets	4,294,475	4,417,033
Crude oil pipelines and natural gas pipelines and related assets
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	2,891,489	2,918,285
Onshore facilities, machinery, and equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	640,376	639,023
Onshore facilities, machinery, and equipment | Alkali Business
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	591,547	533,924
Transportation equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	19,864	20,102
Marine vessels
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	979,171	951,597
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	238,451	222,242
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	22,645	20,505
Construction in progress
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	115,162	94,025
Other
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 41,891	$ 41,155