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Stock Options And Restricted Stock (Schedule Of Stock-Based Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in operating expense $ 13,234 $ 11,987 $ 10,954
Tax benefit 5,245 4,735 4,329
Stock-based compensation expense, net of tax 7,989 7,252 6,625
Instruction And Educational Support [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in operating expense 3,635 2,400 1,840
Marketing [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in operating expense 65 80 127
Admissions Advisory [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in operating expense         
General And Administration [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in operating expense $ 9,534 $ 9,507 $ 8,987