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Significant Accounting Policies (Schedule Of Company's Operating Expenses As Previously Reported) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
As Reported [Member]
Sep. 30, 2010
As Reported [Member]
Jun. 30, 2010
As Reported [Member]
Mar. 31, 2010
As Reported [Member]
Dec. 31, 2010
As Reclassified [Member]
Sep. 30, 2010
As Reclassified [Member]
Jun. 30, 2010
As Reclassified [Member]
Mar. 31, 2010
As Reclassified [Member]
Percentage of tuition revenue to total revenue     98.00%                  
Instruction and educational support $ 76,373 $ 66,261 $ 151,349 $ 129,645 $ 57,111 $ 49,023 $ 50,101 $ 48,977 $ 74,153 $ 65,759 $ 66,261 $ 63,384
Marketing 16,241 14,461 32,283 28,312 29,802 [1] 34,735 [1] 24,882 [1] 24,745 [1] 18,337 [1] 23,621 [1] 14,461 [1] 13,851 [1]
Admissions advisory 6,450 6,061 13,641 12,110         6,584 6,583 6,061 6,049
General and administrative 14,580 13,809 29,102 28,500 26,133 25,590 25,609 24,253 13,972 13,385 13,809 14,691
Operating expenses         $ 113,046 $ 109,348 $ 100,592 $ 97,975 $ 113,046 $ 109,348 $ 100,592 $ 97,975
[1] This line item was labeled Marketing and admissions expense on an "as reported" basis in 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 2010.