Accounts Receivable (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts, beginning of year	$ 6,112	$ 4,284	$ 7,630
Charges to costs and expenses	2,474	3,136	879
Write-offs of uncollectible accounts, net of recoveries	(2,129)	(1,293)	(3,985)
Business acquisitions and disposals	0	0	(593)
Currency translation adjustments	149	(15)	353
Allowance for doubtful accounts, end of year	$ 6,606	$ 6,112	$ 4,284