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Stock Options, Restricted Stock and Restricted Stock Units (Tables)
3 Months Ended
Mar. 31, 2015
Stock Options, Restricted Stock and Restricted Stock Units [Abstract]  
Schedule of restricted stock and restricted stock units activity

 

  Number
of shares
or units
  Weighted-
average grant
price
 
Balance, December 31, 2014  524,216  $115.67 
Grants  71,991  $70.15 
Vested shares    $ 
Forfeitures  (1,298) $115.55 
Balance, March 31, 2015  594,909  $109.71 
Schedule of stock option activity and other stock option information

  Number of
shares
  Weighted-average exercise price  Weighted-average remaining
contractual
life (years)
  

Aggregate intrinsic

value(1)

(in thousands)

 
Balance, December 31, 2014  100,000  $51.95   6.0  $2,233 
Grants              
Exercises              
Forfeitures/Expirations              
     Balance, March 31, 2015  100,000  $51.95   5.8  $146 
     Exercisable, March 31, 2015  100,000  $51.95   5.8  $146 

(1)The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the Company’s closing stock price on the respective trading day and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holder had all options been exercised on the respective trading day. The amount of intrinsic value will change based on the fair market value of the Company’s common stock.
Schedule of stock-based compensation expense

  For the three months
ended March 31,
 
  2014  2015 
Instruction and educational support $434  $367 
Marketing      
Admissions advisory      
General and administration  1,527   2,084 
Stock-based compensation expense included in operating expense  1,961   2,451 
Tax benefit  781   956 
Stock-based compensation expense, net of income tax $1,180  $1,495