Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 150,838	$ 149,535	$ 447,741	$ 453,890
Costs and expenses:
Instructional costs and services	73,228	71,817	222,115	215,604
Selling and promotional	33,315	40,917	106,205	116,082
General and administrative	30,885	29,667	96,907	89,179
Impairment of goodwill and intangible assets (Note 6)	0	0	64,000	144,900
(Gain) loss on disposals of long-lived assets	(16)	178	17	962
Depreciation and amortization	7,026	7,982	22,735	24,249
Total costs and expenses	144,438	150,561	511,979	590,976
Income (loss) from operations before interest and income taxes	6,400	(1,026)	(64,238)	(137,086)
Gain on acquisition (Note 3)	0	0	0	3,828
Interest expense, net	(792)	(3,594)	(3,668)	(10,339)
Income (loss) before income taxes	5,608	(4,620)	(67,906)	(143,597)
Income tax expense (benefit)	3,712	(860)	(12,839)	(35,152)
Equity investment loss, net of tax	(5,224)	(2)	(5,233)	(13)
Net loss	(3,328)	(3,762)	(60,300)	(108,458)
Preferred stock dividends	1,525	0	4,469	0
Net (loss) income available to common stockholders basic	(4,853)	(3,762)	(64,769)	(108,458)
Net (loss) income available to common stockholders diluted	$ (4,853)	$ (3,762)	$ (64,769)	$ (108,458)
Loss per common share:
Basic (in dollars per share)	$ (0.27)	$ (0.20)	$ (3.55)	$ (5.75)
Diluted (in dollars per share)	$ (0.27)	$ (0.20)	$ (3.54)	$ (5.74)
Weighted average number of common shares:
Basic (in shares)	17,778	18,885	18,230	18,854
Diluted (in shares)	17,820	18,927	18,294	18,906