Revenue Recognition - Schedule of Contract Liability Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Contract Liabilities
Beginning balance	$ 12,948	$ 12,997	$ 9,003
Payments in advance of satisfaction of performance obligations	25,614	13,030	12,170
Revenue recognized	(20,687)	(12,072)	(10,542)
Other, including translation adjustments	377	(1,007)	2,366
Ending balance	$ 18,252	$ 12,948	$ 12,997