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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 270,078	$ 239,026	$ 859,587	$ 760,159
U.S. Higher Education Segment
Disaggregation of Revenue [Line Items]
Revenues	191,893	230,311	630,647	733,174
U.S. Higher Education Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	184,126	221,235	605,036	704,251
U.S. Higher Education Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	7,767	9,076	25,611	28,923
Australia/New Zealand Segment
Disaggregation of Revenue [Line Items]
Revenues	65,224	0	190,549	0
Australia/New Zealand Segment | Tuition, net of discounts, grants and scholarships
Disaggregation of Revenue [Line Items]
Revenues	64,456	0	187,018	0
Australia/New Zealand Segment | Other
Disaggregation of Revenue [Line Items]
Revenues	768	0	3,531	0
Alternative Learning
Disaggregation of Revenue [Line Items]
Revenues	$ 12,961	$ 8,715	$ 38,391	$ 26,985

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