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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 1,961 $ 2,250
Tax benefit 781 895
Stock-based compensation expense, net of income tax 1,180 1,355
Instruction and educational support [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense 434 1,097
Marketing [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense      
Admissions advisory [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense      
General and administration [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 1,527 $ 1,153