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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

Allowance for Doubtful Accounts Receivable, Write-offs (Recoveries)

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Increase (Decrease) Allowance for Doubtful Accounts Receivable [Abstract]

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

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Amount of fresh-start adjustment to short-term borrowings.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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