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

6 Months Ended

Jun. 30, 2021

Fixed Assets And Asset Retirement Obligations [Abstract]

Fixed assets, net consisted of the following:


	June 30, 2021		December 31, 2020
Crude oil pipelines and natural gas pipelines and related assets	$	2,821,996	$	2,811,030
Alkali facilities, machinery, and equipment	641,619		622,598
Onshore facilities, machinery, and equipment	268,689		267,810
Transportation equipment	21,348		19,470
Marine vessels	1,011,171		998,553
Land, buildings and improvements	221,146		219,382
Office equipment, furniture and fixtures	22,185		22,001
Construction in progress	260,742		170,740
Other	43,261		41,891
Fixed assets, at cost	5,312,157		5,173,475
Less: Accumulated depreciation	(1,437,510)		(1,322,141)
Net fixed assets	$	3,874,647	$	3,851,334

Schedule of Mineral Leaseholds

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


	June 30, 2021		December 31, 2020
Mineral leaseholds	$	566,019	$	566,019
Less: Accumulated depletion	(15,060)		(13,444)
Mineral leaseholds, net of accumulated depletion	$	550,959	$	552,575

Schedule of Depreciation and Depletion Expense

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Depreciation expense	$	64,148	$	75,089	$	126,850	$	144,331
Depletion expense	704		841		1,616		1,804

During the second quarter of 2020, due to the challenging economic environment from the decline in commodity prices (including the collapse in the differential of Western Canadian Select to the Gulf Coast) and Covid-19, crude-by-rail transportation became uneconomic for producers and the demand and outlook for our rail logistics assets declined. As a result, we recognized impairment expense of $277.5 million associated with the rail logistics assets in our onshore facilities and transportation segment, including $272.7 million of net fixed assets and $4.8 million of right of use assets, net on the Unaudited Condensed Consolidated Balance Sheet. The fair value was calculated utilizing the income approach and assumptions were primarily based on level 3 inputs of the fair value hierarchy.

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	5,177
Changes in estimate	97


Settlements	(2,824)

ARO liability balance, June 30, 2021	$	179,302

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	$	4,975
	2022	$	9,384
	2023	$	9,128
	2024	$	9,783
	2025	$	10,487