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Consolidated Income Statements (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statements [Abstract]
Net revenue	$ 108,909	$ 98,946	$ 313,736	$ 285,594
Costs and expenses:
Instructional costs and services	48,933	45,717	144,162	133,409
Selling and promotional, including $151 and $2,702 for the three months ended September 30, 2011 and 2010, respectively, and $612 and $7,694 for the nine months ended September 30, 2011 and 2010, respectively, to related parties	31,248	28,103	88,789	83,955
General and administrative	7,145	6,608	21,015	18,888
Lease termination fee	922		922
Exit costs		27		232
Total costs and expenses	88,248	80,455	254,888	236,484
Operating income	20,661	18,491	58,848	49,110
Interest expense	(170)	(176)	(306)	(682)
Interest income	20	33	78	131
Income before income taxes	20,511	18,348	58,620	48,559
Income tax expense	7,643	7,606	23,398	19,603
Net income	$ 12,868	$ 10,742	$ 35,222	$ 28,956
Net income per common share:
Basic	$ 0.29	$ 0.23	$ 0.79	$ 0.63
Diluted	$ 0.29	$ 0.23	$ 0.78	$ 0.62
Shares used in computing net income per common share:
Basic	44,302	45,746	44,845	45,715
Diluted	44,787	46,351	45,293	46,413

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