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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]                        
Revenues $ 76,327 $ 54,483 $ 82,717 $ 87,234 $ 87,666 $ 79,042 $ 81,746 $ 83,050   $ 300,761 $ 331,504 $ 316,965
Loss from operations 6,153 (13,779) (499) 4,254 5,438 (455) (5,580) (7,205)   (3,871) (7,802) (35,275)
Depreciation and amortization                   11,804 15,904 15,688
Net income (loss) 6,450 $ (13,268) $ 10,142 $ 4,684 5,477 $ (365) $ (5,263) (7,717)   8,008 (7,868) (32,682)
Total assets 441,981       270,526         441,981 270,526  
Depreciation and amortization, assets subject to financing obligation               $ 1,400 $ 1,400 1,300    
Operating Segments | Postsecondary Education                        
Segment Reporting Information [Line Items]                        
Revenues                   287,195 316,589 300,753
Loss from operations                   (3,493) (6,685) (31,707)
Depreciation and amortization                   11,698 15,747 14,978
Net income (loss)                   8,386 (7,149) (29,713)
Total assets 435,144       263,974         435,144 263,974  
Corporate, Non-Segment | Other                        
Segment Reporting Information [Line Items]                        
Revenues                   13,566 14,915 16,212
Loss from operations                   (378) (1,117) (3,568)
Depreciation and amortization                   106 157 710
Net income (loss)                   (378) (719) $ (2,969)
Total assets $ 6,837       $ 6,552         $ 6,837 $ 6,552