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Stock Options, Restricted Stock and Restricted Stock Units (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of stock-based compensation expense      
Stock-based compensation expense included in operating expense $ 10,213 $ 9,453 $ 9,291
Tax benefit 4,032 3,734 3,698
Stock-based compensation expense, net of income tax 6,181 5,719 5,593
Instruction and educational support [Member]      
Schedule of stock-based compensation expense      
Stock-based compensation expense included in operating expense $ 2,134 $ 1,736 $ 1,976
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 $ 8,079 $ 7,717 $ 7,315