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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 2,546 $ 2,982 $ 4,507 $ 5,232
Tax benefit 1,013 1,187 1,794 2,082
Stock-based compensation expense, net of income tax 1,533 1,795 2,713 3,150
Instruction and educational support [Member]
       
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 475 844 909 1,941
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 $ 2,071 $ 2,138 $ 3,598 $ 3,291