Fixed Assets and Asset Retirement Obligations - (Schedule of Fixed Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 5,601,015	$ 4,763,396
Less: Accumulated depreciation	(734,986)	(548,532)
Net fixed assets	4,866,029	4,214,864
Crude oil pipelines and natural gas pipelines and related assets
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	3,028,657	2,901,202
Onshore facilities, machinery, and equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	692,364	427,658
Onshore facilities, machinery, and equipment | Alkali Business [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	497,601	0
Transportation equipment
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	21,483	17,543
Marine vessels
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	918,953	863,199
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	223,186	55,712
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	18,112	9,654
Construction in progress
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	151,768	440,225
Other
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 48,891	$ 48,203