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Commitments and Contingencies (Tables) | 12 Months Ended
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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,
| 2021 |  | 2020 |  | 2019
Balance, beginning of year | $ | 45,771 |  |  | $ | 42,592 |  |  | $ | 49,569 |
Expenditures | (2,752) |  |  | (3,290) |  |  | (6,037) |
Accretion of discount | 960 |  |  | 925 |  |  | 1,030 |
Additions and changes in estimates | 4,063 |  |  | 3,815 |  |  | 1,129 |
Foreign currency translation adjustments and other | (1,425) |  |  | 1,729 |  |  | (3,099) |
Balance, end of year | 46,617 |  |  | 45,771 |  |  | 42,592 |
Less amounts reported in Accrued expenses | 9,077 |  |  | 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,
| 2021 |  | 2020
Balance, beginning of year | $ | 75,872 |  |  | $ | 60,246 |
Acquisitions(a) | — |  |  | 1,222 |
Additions and changes in estimates(b) | 4,832 |  |  | 15,750 |
Accretion of discount | 2,098 |  |  | 2,531 |
Liabilities settled | (3,605) |  |  | (3,980) |
Foreign currency translation adjustments and other | 16 |  |  | 103 |
Balance, end of year | $ | 79,213 |  |  | $ | 75,872 |
Less amounts reported in Accrued expenses | 3,017 |  |  | 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):
| 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Thereafter
Letters of credit and other guarantees | $ | 62,715 |  |  | $ | 7,127 |  |  | $ | 987 |  |  | $ | 68 |  |  | $ | 118 |  |  | $ | 10,154 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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