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Stockholders' Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 3,166 $ 3,527 $ 8,398 $ 9,358
Tax benefit 1,260 1,393 3,342 3,696
Stock-based compensation expense, net of income tax 1,906 2,134 5,056 5,662
Instruction and educational support [Member]
       
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 815 976 2,756 2,538
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 $ 2,351 $ 2,551 $ 5,642 $ 6,820