Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Income
Revenue	$ 387,877	$ 401,849	$ 771,048	$ 785,806
Costs and expenses:
Cost of educational services	142,272	133,763	280,198	268,145
Student services and administrative expenses	115,626	110,954	220,209	217,914
Total costs and expenses	257,898	244,717	500,407	486,059
Operating income	129,979	157,132	270,641	299,747
Interest income	790	533	1,625	1,242
Interest (expense)	(507)	(514)	(1,064)	(934)
Income before provision for income taxes	130,262	157,151	271,202	300,055
Provision for income taxes	51,262	61,111	106,816	116,564
Net income	$ 79,000	$ 96,040	$ 164,386	$ 183,491
Earnings per share:
Basic	$ 2.88	$ 2.82	$ 5.81	$ 5.31
Diluted	$ 2.85	$ 2.78	$ 5.77	$ 5.24
Weighted average shares outstanding:
Basic	27,474	34,081	28,275	34,552
Diluted	27,719	34,525	28,511	35,010