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Accounts Receivable (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Receivables [Abstract] |  |
Accounts Receivable, Allowance for Credit Loss Roll Forward | The activity in our accounts receivable allowance consists of the following for the nine months ended September 30, 2021 and year ended December 31, 2020, respectively:
| September 30, |  | December 31, |  |
| 2021 |  | 2020 |  |
Balance at beginning of year | $ | 8,745 |  |  | $ | 16,511 |  |  |
Additional provisions | 6,532 |  |  | 4,339 |  |  |
Write-offs | (6,405) |  |  | (22,205) |  |  |
Opening balance sheet adjustment related to ASU 2016 -13 adoption | — |  |  | 10,097 |  |  |
Exchange differences | (230) |  |  | 3 |  |  |
Balance at the end of year | $ | 8,642 |  |  | $ | 8,745 |  |  |
Accounts Receivable, Allowance for Credit Loss, Current | $ 8,745 | $ 16,511
Additional provisions | 6,532 | 4,339
Write-offs | 6,405 | 22,205
Opening balance sheet adjustment related to ASU 2016 -13 adoption | 0 | 10,097
Exchange differences | (230) | 3
Accounts Receivable, Allowance for Credit Loss, Current | $ 8,642 | $ 8,745

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- Definition Accounts Receivable Allowance For Credit Loss Additional Provisions + References No definition available. + Details
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- Definition Accounts Receivable Allowance For Credit Loss Increase Decrease From Exchange Differences + References No definition available. + Details
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- Definition Accounts Receivable, Allowance for Credit Loss, Accounting Change + References No definition available. + Details
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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- References No definition available. + Details
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