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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Doubtful Accounts |  |  |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period | [1] | $ 4,001 | $ 5,497 |  | $ 4,722 |
Additions |  | 8 | 1,201 | [1] | 775 | [1]
Deductions |  | (54) | (2,697) | [1] |  |
Balance at end of period |  | 3,955 | 4,001 | [1] | 5,497 | [1]
Valuation Allowance on Deferred Tax Assets |  |  |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | 23,878 | 17,359 |  | 6,668 |
Additions |  | 4,873 | 7,655 |  | 10,817 |
Deductions |  | (878) | (596) |  | (32) |
Other and foreign exchange impact |  | (525) | (540) |  | (94) |
Balance at end of period |  | $ 27,348 | $ 23,878 |  | $ 17,359 |
[1] | In connection with the adoption of ASU 2016-13, we have modified the historical presentation of gross receivables and the allowance for doubtful accounts to reflect only expected credit losses in the allowance in conformity with the current period presentation.

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