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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 2,891 $ 2,451
Tax benefit 1,099 956
Stock-based compensation expense, net of tax 1,792 1,495
Instruction and educational support [Member]    
Schedule of stock-based compensation expense    
Stock-based compensation expense included in operating expense $ 651 $ 367
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 $ 2,240 $ 2,084