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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Activity in Recorded Environmental Liabilities Activity
We had the following activity in our recorded environmental liabilities for the years ended December 31, 2021, 2020 and 2019 (in thousands):
Year Ended December 31,
202120202019
Balance, beginning of year$45,771 $42,592 $49,569 
Expenditures(2,752)(3,290)(6,037)
Accretion of discount960 925 1,030 
Additions and changes in estimates4,063 3,815 1,129 
Foreign currency translation adjustments and other(1,425)1,729 (3,099)
Balance, end of year46,617 45,771 42,592 
Less amounts reported in Accrued expenses9,077 9,473 9,534 
Amounts reported in Other noncurrent liabilities$37,540 $36,298 $33,058 
Schedule of Change in Asset Retirement Obligation
The following is a reconciliation of our beginning and ending asset retirement obligation balances for 2021 and 2020 (in thousands):
Year Ended December 31,
20212020
Balance, beginning of year$75,872 $60,246 
Acquisitions(a)
— 1,222 
Additions and changes in estimates(b)
4,832 15,750 
Accretion of discount2,098 2,531 
Liabilities settled(3,605)(3,980)
Foreign currency translation adjustments and other16 103 
Balance, end of year$79,213 $75,872 
Less amounts reported in Accrued expenses3,017 1,016 
Amounts reported in Other noncurrent liabilities$76,196 $74,856 
(a)    Represents purchase price adjustments for the Wodgina Project acquisition recorded during the year ended December 31, 2020.
(b)    Additions in 2021 primarily related to the updated of an estimate at a site formerly owned by Albemarle. 2020 additions related to new asset retirement obligations in Chile and Australia.
Letters of Credit and Guarantee Agreements The following table summarizes our letters of credit and guarantee agreements (in thousands):
20222023202420252026Thereafter
Letters of credit and other guarantees$62,715 $7,127 $987 $68 $118 $10,154