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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
ASSET RETIREMENT OBLIGATIONS

AROs at December 31, 2019 and 2018 were (in thousands): 
 
2019
 
2018
Asset retirement obligations  
$
18,796

 
$
18,381

Less: Asset retirement obligations due within one year*  
3,197

 
4,443

Long-term asset retirement obligations 
$
15,599

 
$
13,938


                               
*
Classified as a current liability on the consolidated balance sheets, under the caption “Other current liabilities.” Related to remediation work planned for 2020.

 
Total accretion expense related to AROs was $1.5 million, $1.7 million and $1.4 million during the years ended December 31, 2019, 2018 and 2017, respectively.
 
During the years ended December 31, 2019, 2018 and 2017, our ARO changed as follows (in thousands): 
 
2019
 
2018
 
2017
Balance as of January 1
$
18,381

 
$
17,185

 
$
17,584

Accretion of discount
1,538

 
1,689

 
1,353

New obligations
497

 
6,629

 
86

Change in estimates of existing obligations 
(1,989
)
 
(4,336
)
 
(1,901
)
Settlement of obligations
(462
)
 
(1,013
)
 
(816
)
Foreign currency translation 
831

 
(1,773
)
 
879

Balance as of December 31
$
18,796

 
$
18,381

 
$
17,185