Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
REVENUE:
Total revenue		$ 695,208	$ 693,034	$ 687,314
OPERATING EXPENSES:
Educational services and facilities		116,723	108,743	111,768
General and administrative		426,120	418,509	417,214
Depreciation and amortization		19,734	16,766	14,786
Asset impairment		2,994		612
Total operating expenses		565,571	544,018	544,380
Operating income		129,637	149,016	142,934
OTHER INCOME:
Interest income		6,866	930	3,852
Interest expense		(400)	(920)	(167)
Miscellaneous(expense) income		(1,834)	41	121
Total other income		4,632	51	3,806
PRETAX INCOME		134,269	149,067	146,740
Provision for income taxes		38,402	39,430	22,476
NET INCOME		$ 95,867	$ 109,637	$ 124,264
NET INCOME PER SHARE - BASIC:		$ 1.41	$ 1.57	$ 1.79
NET INCOME PER SHARE - DILUTED:		$ 1.39	$ 1.55	$ 1.74
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic		67,934	70,024	69,414
Diluted		69,031	70,881	71,265
Tuition and Fees, Net [Member]
REVENUE:
Total revenue		$ 687,672	$ 688,415	$ 684,579
Other [Member]
REVENUE:
Total revenue	[1]	$ 7,536	$ 4,619	$ 2,735

[1] Other revenue primarily includes contract training revenue and miscellaneous non-student related revenue.