Segment and Geographic Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Revenues	$ 1,065,480	$ 1,131,686	$ 1,027,653
Income (loss) from operations
Income (loss) from operations	70,760	73,912	109,384
Amortization of intangible assets	(14,350)	(51,495)	(64,225)
Merger and integration costs	(1,117)	(11,201)	(13,770)
Restructuring costs	(2,115)	(25,472)	(12,382)
Segment Reconciling Items
Income (loss) from operations
Amortization of intangible assets	(14,350)	(51,495)	(64,225)
Merger and integration costs	(1,117)	(11,201)	(13,770)
Restructuring costs	(2,115)	(25,472)	(12,382)
U.S. Higher Education
Revenues
Revenues	770,979	829,270	966,579
Income (loss) from operations
Income (loss) from operations	38,605	104,914	193,393
Australia / New Zealand
Revenues
Revenues	230,747	250,124	23,381
Income (loss) from operations
Income (loss) from operations	30,473	35,855	(13,275)
Education Technology Services
Revenues
Revenues	63,754	52,292	37,693
Income (loss) from operations
Income (loss) from operations	$ 19,264	$ 21,311	$ 19,643