Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2021

Fixed Assets And Asset Retirement Obligations [Abstract]

Schedule of Fixed Assets

Fixed assets, net consisted of the following:

	March 31, 2021		December 31, 2020
Crude oil pipelines and natural gas pipelines and related assets	$	2,810,931	$	2,811,030
Alkali facilities, machinery, and equipment	635,446		622,598
Onshore facilities, machinery, and equipment	268,571		267,810
Transportation equipment	19,520		19,470
Marine vessels	1,002,601		998,553
Land, buildings and improvements	220,454		219,382
Office equipment, furniture and fixtures	22,096		22,001
Construction in progress	183,628		170,740
Other	43,261		41,891
Fixed assets, at cost	5,206,508		5,173,475
Less: Accumulated depreciation	(1,381,384)		(1,322,141)
Net fixed assets	$	3,825,124	$	3,851,334

Schedule of Mineral Leaseholds

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

	March 31, 2021		December 31, 2020
Mineral leaseholds	$	566,019	$	566,019
Less: Accumulated depletion	(14,356)		(13,444)
Mineral leaseholds, net of accumulated depletion	$	551,663	$	552,575

Schedule of Depreciation and Depletion Expense

Our depreciation and depletion expense for the periods presented was as follows:

	Three Months Ended March 31,
	2021		2020
Depreciation expense	$	62,702	$	69,242
Depletion expense	912		963

Schedule of Change in Asset Retirement Obligation

The following table presents information regarding our AROs since December 31, 2020:

ARO liability balance, December 31, 2020	$	176,852
Accretion expense	2,584
Changes in estimate	797
Settlements	(2,017)
ARO liability balance, March 31, 2021	$	178,216

Schedule of Forecast of Accretion Expense of Asset Retirement Obligations

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

Remainder of	2021	$	7,532
	2022	$	9,384
	2023	$	9,128
	2024	$	9,783
	2025	$	10,487