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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 9 Months Ended
Sep. 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:
 
 
September 30,
2019
 
December 31,
2018
Crude oil pipelines and natural gas pipelines and related assets
$
2,922,029

 
$
2,918,285

Alkali facilities, machinery, and equipment
563,654

 
533,924

Onshore facilities, machinery, and equipment
626,492

 
639,023

Transportation equipment
19,484

 
20,102

Marine vessels
969,432

 
951,597

Land, buildings and improvements
225,334

 
222,242

Office equipment, furniture and fixtures
20,889

 
20,505

Construction in progress
132,229

 
94,025

Other
41,891

 
41,155

Fixed assets, at cost
5,521,434

 
5,440,858

Less: Accumulated depreciation
(1,212,062
)
 
(1,023,825
)
Net fixed assets
$
4,309,372

 
$
4,417,033



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

 
$
566,019

Less: Accumulated depletion
(9,026
)
 
(5,538
)
Mineral leaseholds, net
$
556,993

 
$
560,481



Our depreciation and depletion expense for the periods presented was as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Depreciation expense
$
77,228

 
$
85,282

 
$
222,106

 
$
224,546

Depletion expense
1,204

 
722

 
3,488

 
2,913



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
6,825

Changes in estimate
(14,377
)
Settlements
(36,028
)
ARO liability balance, September 30, 2019
$
196,285


Of the ARO balances disclosed above, $53.0 million and $67.5 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of September 30, 2019 and December 31, 2018, respectively. The remainder of the ARO liability as of September 30, 2019 and December 31, 2018 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet. During 2019, we recorded total changes in estimates of $14.4 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
$
2,763

 
2020
$
8,828

 
2021
$
8,847

 
2022
$
9,414

 
2023
$
10,078


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