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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2019
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:
 
 
June 30,
2019
 
December 31,
2018
Crude oil pipelines and natural gas pipelines and related assets
$
2,919,237

 
$
2,918,285

Alkali facilities, machinery, and equipment
542,919

 
533,924

Onshore facilities, machinery, and equipment
640,129

 
639,023

Transportation equipment
19,573

 
20,102

Marine vessels
960,947

 
951,597

Land, buildings and improvements
223,341

 
222,242

Office equipment, furniture and fixtures
20,560

 
20,505

Construction in progress
136,763

 
94,025

Other
41,891

 
41,155

Fixed assets, at cost
5,505,360

 
5,440,858

Less: Accumulated depreciation
(1,160,353
)
 
(1,023,825
)
Net fixed assets
$
4,345,007

 
$
4,417,033



Mineral Leaseholds
Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
 
June 30,
2019
 
December 31,
2018
Mineral leaseholds
$
566,019

 
$
566,019

Less: Accumulated depletion
(7,822
)
 
(5,538
)
Mineral leaseholds, net
$
558,197

 
$
560,481



Our depreciation and depletion expense for the periods presented was as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Depreciation expense
$
73,206

 
$
70,836

 
$
144,878

 
$
139,264

Depletion expense
965

 
1,054

 
2,284

 
2,191



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, 2018:
ARO liability balance, December 31, 2018
$
239,865

Accretion expense
4,576

Changes in estimate
(15,711
)
Settlements
(20,277
)
ARO liability balance, June 30, 2019
$
208,453


Of the ARO balances disclosed above, $62.2 million and $67.5 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of June 30, 2019 and December 31, 2018, respectively. The remainder of the ARO liability as of June 30, 2019 and December 31, 2018 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet. During 2019, we recorded a change in estimate of $15.7 million related to revisions in our estimated abandonment costs for certain of our non-operating offshore gas assets.
With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of
2019
$
5,136

 
2020
$
9,053

 
2021
$
9,297

 
2022
$
9,892

 
2023
$
10,586


Certain of our unconsolidated affiliates have AROs recorded at June 30, 2019 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.