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Supplemental Balance Sheet Information
 12 Months Ended
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]  
Supplemental Balance Sheet Information SUPPLEMENTAL BALANCE SHEET INFORMATION

Components of "Intangibles and other assets, net" at December 31, 2019 and 2018 were as follows:
 
2019
 
2018
Catalyst and turnaround costs
$
1,655

 
$
926

Other intangible assets
936

 
1,310

Other
976

 
2,348

 
$
3,567

 
$
4,584



Other intangible assets consist of covenants not-to-compete and technology-based assets.

Aggregate amortization expense for customer contracts and other intangible assets included in continuing operations was $5,797, $2,353, and $3,114, for the years ended December 31, 2019, 2018 and 2017, respectively, and accumulated amortization amounted to $6,519 and $5,907 at December 31, 2019 and 2018, respectively.

Estimated amortization expense for intangibles and other assets for the years subsequent to December 31, 2019 are as follows: 2020 - $4,893; 2021 - $1,080; 2022 - $892; 2023 - $214; 2024 - $29; subsequent years - $26.

Components of "Other accrued liabilities" at December 31, 2019 and 2018 were as follows:
 
2019
 
2018
Accrued interest
$
10,761

 
$
10,735

Asset retirement obligations
25

 
2,721

Property and other taxes payable
5,411

 
5,751

Accrued payroll
3,011

 
3,110

Operating lease liabilities
7,722

 
—

Other
1,859

 
2,063

 
$
28,789

 
$
24,380



The schedule below summarizes the changes in our asset retirement obligations:
 
Year Ended December 31,
 
2019
 
2018
 
(In thousands)
 
 
 
 
Beginning asset retirement obligations
$
12,429

 
$
13,512

Revisions to existing liabilities1
—

 
4,041

Accretion expense
407

 
516

Liabilities settled
(3,900
)
 
(5,640
)
Ending asset retirement obligations
8,936

 
12,429

Current portion of asset retirement obligations2
(25
)
 
(2,721
)
Long-term portion of asset retirement obligations3
$
8,911

 
$
9,708


1Several factors are considered in the annual review process, including inflation rates, current estimates for removal cost, discount rates, and the estimated remaining useful life of the assets.

2The current portion of asset retirement obligations is included in "Other current liabilities" on the Partnership's Consolidated Balance Sheets.

3The non-current portion of asset retirement obligations is included in "Other long-term obligations" on the Partnership's Consolidated Balance Sheets.