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ASSET RETIREMENT OBLIGATIONS
 12 Months Ended
Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATIONS ASSET RETIREMENT OBLIGATIONS
AROs at December 31, 2023 and 2022 were (in thousands): 
 20232022
Asset retirement obligations  $16,215 $18,113 
Less: Asset retirement obligations due within one year (1)  
2,576 4,550 
Long-term asset retirement obligations $13,639 $13,563 
(1)
Classified as a current liability on the consolidated balance sheets, under the caption “Other current liabilities.” Balance at December 31, 2023 related to remediation work planned for 2024.
 
Total accretion expense related to AROs was $1.1 million, $1.8 million and $1.4 million during the years ended December 31, 2023, 2022 and 2021, respectively.
 
During the years ended December 31, 2023, 2022 and 2021, our ARO changed as follows (in thousands): 
 202320222021
Balance as of January 1$18,113 $13,745 $14,993 
Accretion of discount1,104 1,830 1,429 
Change in estimates of existing obligations 1,366 4,138 (763)
Settlement of obligations(4,756)(455)(1,943)
Foreign currency translation 388 (1,145)29 
Balance as of December 31$16,215 $18,113 $13,745