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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2020
Fixed Assets And Asset Retirement Obligations [Abstract]  
Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
Fixed Assets
Fixed assets, net consisted of the following:
 
 
March 31,
2020
 
December 31,
2019
Crude oil pipelines and natural gas pipelines and related assets
$
2,892,342

 
$
2,891,489

Alkali facilities, machinery, and equipment
594,263

 
591,547

Onshore facilities, machinery, and equipment
641,135

 
640,376

Transportation equipment
19,662

 
19,864

Marine vessels
994,730

 
979,171

Land, buildings and improvements
238,992

 
238,451

Office equipment, furniture and fixtures
22,659

 
22,645

Construction in progress
122,036

 
115,162

Other
41,891

 
41,891

Fixed assets, at cost
5,567,710

 
5,540,596

Less: Accumulated depreciation
(1,311,219
)
 
(1,246,121
)
Net fixed assets
$
4,256,491

 
$
4,294,475



Mineral Leaseholds
Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
 
March 31,
2020
 
December 31,
2019
Mineral leaseholds
$
566,019

 
$
566,019

Less: Accumulated depletion
(11,157
)
 
(10,194
)
Mineral leaseholds, net of accumulated depletion
$
554,862

 
$
555,825



Our depreciation and depletion expense for the periods presented was as follows:
 
Three Months Ended
March 31,
 
2020
 
2019
Depreciation expense
$
69,242

 
$
71,672

Depletion expense
963

 
1,319



Asset Retirement Obligations
We record asset retirement obligations ("AROs") in connection with legal requirements to perform specified retirement activities under contractual arrangements and/or governmental regulations.
The following table presents information regarding our AROs since December 31, 2019:
ARO liability balance, December 31, 2019
$
175,081

Accretion expense
2,233

Changes in estimate
(800
)
Settlements
(6,986
)
ARO liability balance, March 31, 2020
$
169,528


Of the ARO balances disclosed above, $13.8 million and $26.6 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of March 31, 2020 and December 31, 2019, respectively. The remainder of the ARO liability as of March 31, 2020 and December 31, 2019 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet.
With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of
2020
$
7,029

 
2021
$
9,402

 
2022
$
9,412

 
2023
$
10,075

 
2024
$
10,786


Certain of our unconsolidated affiliates have AROs recorded at March 31, 2020 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.