Accounts Receivable - Accounts Receivable, Expected Credit Loss (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses as of January 1,	$ (6,632)	$ (5,081)
Credit loss expense	(3,725)	(1,530)
Credit loss income and utilization	2,295	968
Foreign currency translation effects	106	295
Allowance for credit losses as of September 30,	$ (7,955)	$ (5,348)