Business Combinations Brainjocks (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 23, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Adjustment to fair value of contingent consideration		$ 42	$ 2,061	$ 46	$ 3,793
Goodwill		438,173		438,173		$ 427,928
Brainjocks
Business Acquisition [Line Items]
Date of acquisition	Mar. 23, 2020
Total purchase price	$ 21,200
Cash paid for acquisition	15,800
Company common stock issued at closing	2,400
Net working capital settlement	700
Initial fair value estimate of additional earnings-based contingent consideration	2,300
Fair value of contingent consideration		$ 3,900		3,900
Adjustment to fair value of contingent consideration				$ 300
Transaction costs	1,100
Acquired tangible assets	7,000
Identified intangible assets	8,400
Liabilities assumed	(4,900)
Goodwill	10,700
Tax deductible amount of Goodwill	$ 12,600