Description of Business and Summary of Significant Accounting Policies - Contract Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Deferred revenue included in accounts receivables	$ 7,400	$ 7,200
Change in Contract Liabilities
Balance, beginning of period	40,930	37,253
Revenue recognized from beginning balance	(20,866)	(32,783)
Additions from business acquisitions	0	0
Additions, net of revenue recognized and currency translation	22,982	36,460
Balance, end of period	$ 43,046	$ 40,930