CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenues	$ 1,132,924	$ 1,065,480	$ 1,131,686
Costs and expenses:
Instructional and support costs	623,903	597,321	608,261
General and administration	384,443	379,817	361,345
Amortization of intangible assets	11,457	14,350	51,495
Merger and integration costs	1,544	1,117	11,201
Restructuring costs	16,256	2,115	25,472
Total costs and expenses	1,037,603	994,720	1,057,774
Income from operations	95,321	70,760	73,912
Other income (expense)	5,405	(1,191)	2,687
Income before income taxes	100,726	69,569	76,599
Provision for income taxes	30,935	22,899	21,512
Net income	$ 69,791	$ 46,670	$ 55,087
Earnings per share:
Basic (dollars per share)	$ 2.98	$ 1.97	$ 2.30
Diluted (dollars per share)	$ 2.91	$ 1.94	$ 2.28
Weighted average shares outstanding:
Basic (in shares)	23,403	23,679	23,955
Diluted (in shares)	23,956	23,998	24,122