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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenues $ 1,065,480 $ 1,131,686 $ 1,027,653
U.S. Higher Education      
Disaggregation of Revenue [Line Items]      
Revenues 770,979 829,270 966,579
U.S. Higher Education | Tuition, net of discounts, grants and scholarships      
Disaggregation of Revenue [Line Items]      
Revenues 738,050 795,266 928,476
U.S. Higher Education | Other      
Disaggregation of Revenue [Line Items]      
Revenues 32,929 34,004 38,103
Australia / New Zealand      
Disaggregation of Revenue [Line Items]      
Revenues 230,747 250,124 23,381
Australia / New Zealand | Tuition, net of discounts, grants and scholarships      
Disaggregation of Revenue [Line Items]      
Revenues 224,400 245,791 22,431
Australia / New Zealand | Other      
Disaggregation of Revenue [Line Items]      
Revenues 6,347 4,333 950
Education Technology Services      
Disaggregation of Revenue [Line Items]      
Revenues $ 63,754 $ 52,292 $ 37,693