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Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Contract assets, allowance for credit loss as a percentage of assets | 1.00% |  |  |
Trade receivables |  |  |  |
Beginning balance | $ 75,966 | $ 76,061 | $ 75,176 | $ 53,412
Charges to cost and expenses, net of recoveries | 4,234 | 11,300 |  |
Write-offs | (2,015) |  |  |
Currency effects and other, net | (1,429) | 4,379 |  |
Ending balance | 75,966 | 76,061 |  |
Contract assets |  |  |  |
Beginning balance | 3,205 | 206 |  |
Charges to cost and expenses, net of recoveries | 0 | 0 |  |
Write-offs | 0 |  |  |
Currency effects and other, net | (427) | 58 |  |
Ending balance | 2,778 | 3,043 |  |
Long-term Receivables |  |  |  |
Beginning balance | 67,842 | 68,555 |  |
Currency effects and other, net | (145) | (730) |  |
Ending balance | 67,697 | 67,146 |  |
ASU No. 2016-13 - Measurement of Credit Losses on Financial Instruments (Topic 326) |  |  |  |
Trade receivables |  |  |  |
Beginning balance |  |  |  | $ 6,970
Contract assets |  |  |  |
Beginning balance |  | 2,779 |  |
Long-term Receivables |  |  |  |
Beginning balance | $ 0 | $ (679) |  |

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