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Stockholders' Equity (Schedule Of Stock-Based Compensation Expense) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stockholders' Equity [Line Items]    
Stock-based compensation expense included in operating expense$ 3,470$ 2,887$ 9,798$ 8,984
Tax benefit1,3711,1403,8703,548
Stock-based compensation expense, net of tax2,0991,7475,9285,436
Instruction And Educational Support [Member]
    
Stockholders' Equity [Line Items]    
Stock-based compensation expense included in operating expense9045752,7281,753
Marketing [Member]
    
Stockholders' Equity [Line Items]    
Stock-based compensation expense included in operating expense164151150
General And Administration [Member]
    
Stockholders' Equity [Line Items]    
Stock-based compensation expense included in operating expense$ 2,550$ 2,271$ 7,019$ 7,081