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Stock Options and Restricted Stock (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of stock-based compensation expense      
Stock-based compensation expense included in operating expense $ 5,464 $ 13,234 $ 11,987
Tax benefit 2,158 5,245 4,735
Stock-based compensation expense, net of tax 3,306 7,989 7,252
Instruction and educational support [Member]
      
Schedule of stock-based compensation expense      
Stock-based compensation expense included in operating expense 3,273 3,635 2,400
Marketing [Member]
      
Schedule of stock-based compensation expense      
Stock-based compensation expense included in operating expense    65 80
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 $ 2,191 $ 9,534 $ 9,507