Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 1,065,480	$ 1,131,686	$ 1,027,653
Costs and expenses:
Instructional and support costs	597,321	608,261	532,661
General and administration	379,817	361,345	295,231
Amortization of intangible assets	14,350	51,495	64,225
Merger and integration costs	1,117	11,201	13,770
Restructuring costs	2,115	25,472	12,382
Total costs and expenses	994,720	1,057,774	918,269
Income from operations	70,760	73,912	109,384
Other income (expense)	(1,191)	2,687	4,573
Income before income taxes	69,569	76,599	113,957
Provision for income taxes	22,899	21,512	27,689
Net income	$ 46,670	$ 55,087	$ 86,268
Earnings per share:
Basic (dollars per share)	$ 1.97	$ 2.30	$ 3.81
Diluted (dollars per share)	$ 1.94	$ 2.28	$ 3.77
Weighted average shares outstanding:
Basic (in shares)	23,679	23,955	22,633
Diluted (in shares)	23,998	24,122	22,860