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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 2,653 $ 2,551 $ 7,576 $ 7,058
Tax benefit 1,048 1,015 2,990 2,809
Stock-based compensation expense, net of income tax 1,605 1,536 4,586 4,249
Instruction and educational support [Member]        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 619 $ 406 $ 1,532 $ 1,314
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 $ 2,034 $ 2,145 $ 6,044 $ 5,744