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Segment Reporting - Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Revenues	$ 270,078	$ 239,026	$ 859,587	$ 760,159
Income from operations
Income from operations	7,348	15,422	46,048	105,776
Amortization of intangible assets	(8,932)	(15,417)	(47,731)	(46,251)
Merger and integration costs	(1,111)	(2,920)	(4,060)	(7,858)
Restructuring costs	(3,322)	(4,024)	(26,400)	(4,024)
U.S. Higher Education
Revenues
Revenues	191,893	230,311	630,647	733,174
Income from operations
Income from operations	5,168	33,672	84,981	149,180
Australia / New Zealand
Revenues
Revenues	65,224	0	190,549	0
Income from operations
Income from operations	10,364	0	23,016	0
Alternative Learning
Revenues
Revenues	12,961	8,715	38,391	26,985
Income from operations
Income from operations	$ 5,181	$ 4,111	$ 16,242	$ 14,729

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