Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUE:
Total revenue		$ 175,539	$ 176,035	$ 359,177	$ 347,029
OPERATING EXPENSES:
Educational services and facilities		28,532	28,676	57,506	55,587
General and administrative		107,132	105,840	217,177	209,369
Depreciation and amortization		3,913	4,151	7,915	6,790
Asset impairment					612
Total operating expenses		139,577	138,667	282,598	272,358
Operating income		35,962	37,368	76,579	74,671
OTHER INCOME:
Interest income		322	1,011	681	2,498
Interest expense		(280)	(43)	(389)	(84)
Miscellaneous (expense) income		(35)	125	107	112
Total other income		7	1,093	399	2,526
PRETAX INCOME		35,969	38,461	76,978	77,197
Provision for income taxes		9,319	10,272	19,564	19,876
INCOME FROM CONTINUING OPERATIONS		26,650	28,189	57,414	57,321
LOSS FROM DISCONTINUED OPERATIONS, net of tax		(1)	(22)	(12)	(48)
NET INCOME		$ 26,649	$ 28,167	$ 57,402	$ 57,273
NET INCOME PER SHARE - BASIC:		$ 0.38	$ 0.41	$ 0.82	$ 0.82
NET INCOME PER SHARE - DILUTED:		$ 0.37	$ 0.40	$ 0.80	$ 0.80
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic		70,299	69,094	70,224	69,467
Diluted		71,679	70,900	71,616	71,350
Tuition and Fees [Member]
REVENUE:
Total revenue		$ 174,804	$ 175,499	$ 357,635	$ 345,893
Other [Member]
REVENUE:
Total revenue	[1]	$ 735	$ 536	$ 1,542	$ 1,136

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