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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of 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.
Schedule of Change in Asset Retirement Obligation
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