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Accrued Expenses and Other Liabilities - Components of Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Payables And Accruals [Abstract] |  |  |
Accrued product related costs | $ 3,430 | $ 4,470 |
Accrued income taxes | 6,213 | 7,320 |
Accrued property and other taxes | 1,892 | 2,478 |
Accrued professional fees | 1,594 | 1,663 |
Accrued customer related liabilities | 4,459 | 3,815 |
Dividends payable | 1,292 | 1,291 |
Remediation reserves | 9,994 | 10,642 | $ 11,444
Derivative liabilities | 684 | 671 |
Other accrued liabilities | 6,115 | 5,821 |
Total accrued expenses and other liabilities | $ 35,673 | $ 38,171 |

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