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Significant Accounting and Reporting Policies - Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
Allowance for expected credit losses, January 1 | $ 9,348 | $ 9,625 | $ 12,588
Add/ (Deduct): |  |  |
Adoption of Topic 326 | (464) |  |
Provision for bad debt expense | 1,504 | 1,588 | 2,709
Write-offs, net of recoveries | (908) | (81) | (3,695)
Adjustments for business acquisitions and dispositions | (111) |  | (1,612)
Currency translation and other changes | 95 | (1,784) | (365)
Allowance for expected credit losses, December 31 | $ 9,464 | $ 9,348 | $ 9,625

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- Definition Increase (Decrease) Allowance for Doubtful Accounts Receivable [Abstract] + References No definition available. + Details
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