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ASSET RETIREMENT OBLIGATIONS
 12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATIONS ASSET RETIREMENT OBLIGATIONS
AROs at December 31, 2024 and 2023 were (in thousands): 
 20242023
Asset retirement obligations  $14,109 $16,215 
Less: Asset retirement obligations due within one year (1)  
747 2,576 
Long-term asset retirement obligations (2)
$13,362 $13,639 
(1)
Classified as a current liability on the consolidated balance sheets, under the caption “Other current liabilities.” Balance at December 31, 2024 related to remediation work planned for 2025.
(2)
Classified as a long-term liability on the consolidated balance sheets, under the caption “Other noncurrent liabilities.” Balance at December 31, 2024.
 
Total accretion expense related to AROs was $1.1 million, $1.1 million and $1.8 million during the years ended December 31, 2024, 2023 and 2022, respectively.
 
During the years ended December 31, 2024, 2023 and 2022, our ARO changed as follows (in thousands): 
 202420232022
Balance as of January 1$16,215 $18,113 $13,745 
Accretion of discount1,112 1,104 1,830 
Change in estimates of existing obligations 20 1,366 4,138 
Settlement of obligations(1,936)(4,756)(455)
Foreign currency translation (1,302)388 (1,145)
Balance as of December 31$14,109 $16,215 $18,113