Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenues	$ 1,131,686	$ 1,027,653	$ 997,137
Costs and expenses:
Instructional and support costs	608,261	532,661	530,604
General and administration	361,345	295,231	272,411
Amortization of intangible assets	51,495	64,225	61,667
Merger and integration costs	11,201	13,770	21,923
Restructuring costs	25,472	12,382	0
Total costs and expenses	1,057,774	918,269	886,605
Income from operations	73,912	109,384	110,532
Other income	2,687	4,573	13,192
Income before income taxes	76,599	113,957	123,724
Provision for income taxes	21,512	27,689	42,586
Net income	$ 55,087	$ 86,268	$ 81,138
Earnings per share:
Basic (dollars per share)	$ 2.30	$ 3.81	$ 3.73
Diluted (dollars per share)	$ 2.28	$ 3.77	$ 3.67
Weighted average shares outstanding:
Basic (in shares)	23,955	22,633	21,725
Diluted (in shares)	24,122	22,860	22,097