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Acquisition Activity - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Sep. 01, 2021	Aug. 11, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill			$ 243,486	$ 243,486	$ 26,563	$ 26,563
Acquisition-related expenses				6,300
Rasmussen
Business Acquisition [Line Items]
Payments to acquire businesses, net of cash acquired	$ 325,500
Goodwill	$ 216,923		217,200	$ 217,200
Change in goodwill			$ 300
Graduate School USA
Business Acquisition [Line Items]
Asset acquisition, consideration transferred		$ 1,000