UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 239,026	$ 241,747	$ 760,159	$ 733,365
Costs and expenses:
Instructional and support costs	127,174	132,527	385,654	397,281
General and administration	74,069	72,303	210,596	204,816
Amortization of intangible assets	15,417	15,417	46,251	46,251
Merger and integration costs	2,920	1,500	7,858	11,698
Restructuring costs	4,024	0	4,024	0
Total costs and expenses	223,604	221,747	654,383	660,046
Income from operations	15,422	20,000	105,776	73,319
Other income	912	3,243	4,674	10,695
Income before income taxes	16,334	23,243	110,450	84,014
Provision for income taxes	5,374	6,551	30,099	31,413
Net income	$ 10,960	$ 16,692	$ 80,351	$ 52,601
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.77	$ 3.62	$ 2.42
Diluted (in dollars per share)	$ 0.47	$ 0.75	$ 3.58	$ 2.38
Weighted average shares outstanding:
Basic (in shares)	23,004	21,806	22,193	21,694
Diluted (in shares)	23,214	22,129	22,432	22,096