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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 2,472 $ 2,546 $ 4,923 $ 4,507
Tax benefit 986 1,013 1,942 1,794
Stock-based compensation expense, net of income tax 1,486 1,533 2,981 2,713
Instruction and educational support [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 546 $ 475 $ 914 $ 909
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 $ 1,926 $ 2,071 $ 4,009 $ 3,598