Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 147,214	$ 149,608	$ 296,903	$ 304,355
Costs and expenses:
Instructional costs and services	74,998	72,089	148,887	143,787
Selling and promotional	32,966	35,846	72,890	75,165
General and administrative	32,533	29,923	66,022	59,512
Impairment of goodwill and intangible assets	64,000	144,900	64,000	144,900
Loss on disposals of long-lived assets	32	(9)	33	784
Depreciation and amortization	7,953	8,119	15,709	16,267
Total costs and expenses	212,482	290,868	367,541	440,415
Loss from operations before interest and income taxes	(65,268)	(141,260)	(70,638)	(136,060)
Gain on acquisition (Note 3)	0	(705)	0	3,828
Interest expense	(1,097)	(3,390)	(2,876)	(6,745)
Loss before income taxes	(66,365)	(145,355)	(73,514)	(138,977)
Income tax benefit	(15,137)	(35,332)	(16,551)	(34,292)
Equity investment loss	(4)	(6)	(9)	(11)
Net loss	(51,232)	(110,029)	(56,972)	(104,696)
Preferred stock dividends	1,487	0	2,944	0
Net (loss) income available to common stockholders basic	(52,719)	(110,029)	(59,916)	(104,696)
Net (loss) income available to common stockholders diluted	$ (52,719)	$ (110,029)	$ (59,916)	$ (104,696)
Loss per common share:
Earnings per common share basic (in dollars per share)	$ (2.94)	$ (5.83)	$ (3.25)	$ (5.56)
Earnings per common share diluted (in dollars per share)	$ (2.93)	$ (5.82)	$ (3.23)	$ (5.54)
Weighted average number of common shares:
Basic (in shares)	17,932	18,865	18,457	18,835
Diluted (in shares)	17,991	18,907	18,531	18,893