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Supplemental Balance Sheet Information
 6 Months Ended
Jun. 30, 2020
Balance Sheet Related Disclosures [Abstract]  
Supplemental Balance Sheet Information SUPPLEMENTAL BALANCE SHEET INFORMATION
        
        Components of "Other accrued liabilities" were as follows:
 June 30,
2020		December 31, 2019
Accrued interest$10,121  $10,761  
Asset retirement obligations—  25  
Property and other taxes payable4,305  5,411  
Accrued payroll2,749  3,011  
Operating lease liabilities7,906  7,722  
Other1,415  1,859  
 $26,496  $28,789  

The schedule below summarizes the changes in our asset retirement obligations:
 June 30, 2020
 
Beginning asset retirement obligations$8,936  
Additions to asset retirement obligations379  
Accretion expense206  
Liabilities settled(510) 
Ending asset retirement obligations9,011  
Current portion of asset retirement obligations1
—  
Long-term portion of asset retirement obligations2
$9,011  

1The current portion of asset retirement obligations is included in "Other accrued liabilities" on the Partnership's Consolidated and Condensed Balance Sheets.

2The non-current portion of asset retirement obligations is included in "Other long-term obligations" on the Partnership's Consolidated and Condensed Balance Sheets.