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Significant Accounting Policies (Schedule Of Operating Expenses, Reported And Reclassified On Consolidated Statements Of Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Instruction and educational support $ 292,003 $ 269,557 $ 218,551
Marketing 74,293 70,270 54,967
Admissions advisory 26,531 25,277 23,017
General and administration 55,464 55,857 43,072
As Reported [Member]
      
Instruction and educational support   205,212 166,604
Marketing   114,164 [1] 93,336 [1]
Admissions advisory        
General and administration   101,585 79,667
Operating expenses   420,961 339,607
As Reclassified [Member]
      
Instruction and educational support   269,557 218,551
Marketing   70,270 [1] 54,967 [1]
Admissions advisory   25,277 23,017
General and administration   55,857 43,072
Operating expenses   $ 420,961 $ 339,607
[1] This line item was labeled Marketing and admissions expense on an "as reported" basis in 2009 and 2010. Marketing and admissions expenses related to student support services were reclassified to Instruction and educational support expense, those related to admissions to Admissions advisory, and those related to corporate overhead were reclassified to General and administration expense in 2009 and 2010.