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Share Based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses $ 1,694 $ 1,430
Tax effect of share-based compensation    
Tax effect of share-based compensation (678) (572)
Share-based compensation expense, net of tax 1,016 858
Instructional Costs and Services [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses 825 620
Selling and Promotional [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses 62 64
General and Administrative [Member]
   
Share-based Compensation Expense    
Share-based compensation expense included in operating expenses $ 807 $ 746