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Supplemental Balance Sheet Information
 6 Months Ended
Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]  
Supplemental Balance Sheet Information SUPPLEMENTAL BALANCE SHEET INFORMATION
    
Components of "Other accrued liabilities" were as follows:
 
June 30, 2019
 
December 31, 2018
Accrued interest
$
10,467

 
$
10,735

Asset retirement obligations
—

 
2,721

Property and other taxes payable
4,523

 
5,751

Accrued payroll
3,703

 
3,110

Operating lease liabilities
8,141

 
—

Other
2,326

 
2,063

 
$
29,160

 
$
24,380



The schedule below summarizes the changes in our asset retirement obligations:
 
June 30, 2019
 
 
Beginning asset retirement obligations
$
12,429

Accretion expense
218

Liabilities settled
(3,900
)
Ending asset retirement obligations
8,747

Current portion of asset retirement obligations1
—

Long-term portion of asset retirement obligations2
$
8,747


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.