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Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]
Revenues	$ 149,532	$ 171,956
Costs and expenses:
Instruction and educational support	73,764	74,976
Marketing	15,469	16,042
Admissions advisory	6,793	7,191
General and administration	12,648	14,522
Income from operations	40,858	59,225
Investment income	1	118
Interest expense	1,208	183
Income before income taxes	39,651	59,160
Provision for income taxes	15,662	23,369
Net income	$ 23,989	$ 35,791
Earnings per share:
Basic	$ 2.10	$ 2.81
Diluted	$ 2.09	$ 2.80
Weighted average shares outstanding:
Basic	11,419	12,744
Diluted	11,477	12,794

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration