Fixed Assets and Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2017

Fixed Assets And Asset Retirement Obligations [Abstract]

Schedule of Fixed Assets

Fixed assets consisted of the following:

	December 31,
	2017			2016
Crude oil pipelines and natural gas pipelines and related assets	$	3,028,657		$	2,901,202
Alkali facilities, machinery, and equipment	497,601			—
Onshore facilities, machinery, and equipment	692,364			427,658
Transportation equipment	21,483			17,543
Marine vessels	918,953			863,199
Land, buildings and improvements	223,186			55,712
Office equipment, furniture and fixtures	18,112			9,654
Construction in progress	151,768			440,225
Other	48,891			48,203
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

Schedule of Mineral Leaseholds

Mineral Leaseholds

Our Mineral Leaseholds, as relating to our recently acquired Alkali Business, consist of the following:

	December 31, 2017
Mineral leaseholds	566,019
Less: Accumulated depletion	(1,513		)
Mineral leaseholds, net	$	564,506

Schedule of Change in Asset Retirement Obligation

A reconciliation of our liability for asset retirement obligations is as follows:

December 31, 2015	$	188,662
AROs arising from the acquisition and consolidation of a previously held equity method investment	20,940
Accretion expense	10,800
Revisions in timing and estimated costs of AROs	(2,254		)
Settlements	(4,422		)
December 31, 2016	213,726
Accretion expense	11,008
Revisions in timing and estimated costs of AROs	7,146
Acquisitions	131
Divestitures	(7,649		)
Settlements	(26,415		)
Other	240
December 31, 2017	$	198,187

Schedule of Asset Retirement Obligations

With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:

2018	$	10,799
2019	$	9,760
2020	$	9,429
2021	$	10,069
2022	$	10,753