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Equity Awards - Stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 4,646 $ 3,875 $ 12,714 $ 10,759
Tax benefit 1,228 997 3,359 2,767
Stock-based compensation expense, net of tax 3,418 2,878 9,355 7,992
Instructional and support costs        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 1,365 1,390 3,871 3,776
General and administration        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 3,503 2,485 9,546 6,983
Restructuring costs        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ (222) $ 0 $ (703) $ 0