UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 299,173	$ 255,831	$ 589,509	$ 521,133
Costs and expenses:
Instructional and support costs	152,938	125,544	305,743	258,480
General and administration	93,395	67,301	180,240	136,527
Amortization of intangible assets	19,392	15,417	38,799	30,834
Merger and integration costs	1,937	1,174	2,949	4,938
Restructuring costs	4,811	0	23,078	0
Total costs and expenses	272,473	209,436	550,809	430,779
Income from operations	26,700	46,395	38,700	90,354
Other income	757	1,639	2,924	3,762
Income before income taxes	27,457	48,034	41,624	94,116
Provision for income taxes	7,481	13,882	12,071	24,725
Net income	$ 19,976	$ 34,152	$ 29,553	$ 69,391
Earnings per share:
Basic (in dollars per share)	$ 0.83	$ 1.57	$ 1.23	$ 3.18
Diluted (in dollars per share)	$ 0.83	$ 1.55	$ 1.22	$ 3.15
Weighted average shares outstanding:
Basic (in shares)	23,975	21,764	23,974	21,787
Diluted (in shares)	24,126	22,012	24,139	22,041