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Supplemental Balance Sheet Information | 12 Months Ended
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Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract] |
Supplemental Balance Sheet Information | SUPPLEMENTAL BALANCE SHEET INFORMATION Components of "Intangibles and other assets, net" at December 31, 2021 and 2020 were as follows:
| 2021 |  | 2020
Catalyst and turnaround costs | $ | 687 |  |  | $ | 803 |
Other intangible assets | 358 |  |  | 586 |
Other | 1,153 |  |  | 1,416 |
| $ | 2,198 |  |  | $ | 2,805 |
Other intangible assets consist of technology-based assets. Amortization expense, included in "Depreciation and amortization" on the Partnership's Consolidated Statements of Operations includes amortization of intangible assets, turnaround expenses, and deferred charges. Aggregate amortization expense included in continuing operations was $4,085, $5,235, and $5,797, for the years ended December 31, 2021, 2020 and 2019, respectively. Estimated amortization expense for the years subsequent to December 31, 2021 are as follows: 2022 - $4,403; 2023 - $661; 2024 - $266; 2025 - $84; 2026 - $1; subsequent years - $0. Components of "Other accrued liabilities" at December 31, 2021 and 2020 were as follows:
| 2021 |  | 2020
Accrued interest | $ | 15,135 |  |  | $ | 16,104 |
Asset retirement obligations | 261 |  |  | 1,692 |
Property and other taxes payable | 4,631 |  |  | 4,869 |
Accrued payroll | 2,973 |  |  | 3,244 |
Operating lease liabilities | 6,600 |  |  | 7,529 |
Other | 250 |  |  | 969 |
| $ | 29,850 |  |  | $ | 34,407 |
The schedule below summarizes the changes in our asset retirement obligations:
| Year Ended December 31,
| 2021 |  | 2020
| (In thousands)
Beginning asset retirement obligations | $ | 8,759 |  |  | $ | 8,936 |
Revisions to existing liabilities 1 | — |  |  | 918 |
Accretion expense | 375 |  |  | 410 |
Liabilities settled | (62) |  |  | (1,505) |
Ending asset retirement obligations | 9,072 |  |  | 8,759 |
Current portion of asset retirement obligations 2 | (261) |  |  | (1,692) |
Long-term portion of asset retirement obligations 3 | $ | 8,811 |  |  | $ | 7,067 |
1 Several 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. 2 The current portion of asset retirement obligations is included in "Other current liabilities" on the Partnership's Consolidated Balance Sheets. 3 The non-current portion of asset retirement obligations is included in "Other long-term obligations" on the Partnership's Consolidated Balance Sheets.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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