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Supplemental Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2021
Balance Sheet Related Disclosures [Abstract]  
Schedule of Intangible and Other Assets, Net Components of "Intangibles and other assets, net" at December 31, 2021 and 2020 were as follows:
 20212020
Catalyst and turnaround costs$687 $803 
Other intangible assets358 586 
Other1,153 1,416 
 $2,198 $2,805 
Schedule of Other Accrued Liabilities
Components of "Other accrued liabilities" at December 31, 2021 and 2020 were as follows:
 20212020
Accrued interest$15,135 $16,104 
Asset retirement obligations261 1,692 
Property and other taxes payable4,631 4,869 
Accrued payroll2,973 3,244 
Operating lease liabilities6,600 7,529 
Other250 969 
 $29,850 $34,407 
Schedule of Asset Retirement Obligations
The schedule below summarizes the changes in our asset retirement obligations:
 Year Ended December 31,
 20212020
 (In thousands)
Beginning asset retirement obligations$8,759 $8,936 
Revisions to existing liabilities 1
— 918 
Accretion expense375 410 
Liabilities settled(62)(1,505)
Ending asset retirement obligations9,072 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.