Description of Business and Summary of Significant Accounting Policies (Contract Liabilities) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Deferred revenue included in accounts receivables	$ 6,200	$ 6,400
Change in Contract Liabilities
Balance, beginning of period	37,253	44,660
Revenue recognized from beginning balance	(28,164)	(31,507)
Additions from business acquisitions	0	769
Additions, net of revenue recognized and currency translation	26,192	23,331
Balance, end of period	$ 35,281	$ 37,253