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Supplemental Balance Sheet Information | 12 Months Ended
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Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract] |
Supplemental Balance Sheet Information | SUPPLEMENTAL BALANCE SHEET INFORMATION Components of "Intangibles and other assets, net" at December 31, 2024 and 2023 were as follows:
| 2024 |  | 2023
Catalyst and turnaround costs | $ | 254 |  |  | $ | 701 |
Other intangible assets | 26 |  |  | 55 |
Other | 1,229 |  |  | 1,283 |
| $ | 1,509 |  |  | $ | 2,039 |
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 was $9,050, $5,006, and $5,713, for the years ended December 31, 2024, 2023 and 2022, respectively. Estimated amortization expense for the years subsequent to December 31, 2024 are as follows: 2025 - $9,181; 2026 - $243; 2027 - $0; 2028 - $0; 2029 - $0; subsequent years - $0. Components of "Other accrued liabilities" at December 31, 2024 and 2023 were as follows:
| 2024 |  | 2023
Accrued interest | $ | 17,899 |  |  | $ | 17,956 |
Asset retirement obligations | — |  |  | 25 |
Property and other taxes payable | 4,043 |  |  | 4,348 |
Accrued payroll | 5,187 |  |  | 4,136 |
Operating lease liabilities | 19,707 |  |  | 14,901 |
Other | 44 |  |  | 133 |
| $ | 46,880 |  |  | $ | 41,499 |
The schedule below summarizes the changes in our asset retirement obligations:
| Year Ended December 31,
| 2024 |  | 2023
| (In thousands)
Beginning asset retirement obligations | $ | 5,182 |  |  | $ | 4,992 |
Revisions to existing liabilities 1 | — |  |  | — |
Accretion expense | 131 |  |  | 191 |
Liabilities settled | — |  |  | (1) |
Ending asset retirement obligations | 5,313 |  |  | 5,182 |
Current portion of asset retirement obligations 2 | — |  |  | (25) |
Long-term portion of asset retirement obligations 3 | $ | 5,313 |  |  | $ | 5,157 |
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 accrued 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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