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Equity Awards (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Restricted Stock And Restricted Stock Units Activity
Restricted Stock and Restricted Stock Units
The table below sets forth the restricted stock and restricted stock units activity for each of the three years in the period ended December 31, 2020:
 Number of
shares or units		Weighted-
average
grant price
Balance, December 31, 2017716,128 $99.65 
Grants159,005 93.30 
Awards assumed through acquisition of CEC136,324 118.29 
Vested shares(236,164)76.78 
Forfeitures(37,343)83.69 
Balance, December 31, 2018737,950 114.43 
Grants158,748 128.87 
Vested shares(393,588)141.75 
Forfeitures(34,160)79.02 
Balance, December 31, 2019468,950 98.98 
Grants150,107 140.39 
Vested shares(116,724)69.94 
Forfeitures(7,364)130.68 
Balance, December 31, 2020494,969 $117.91 
Schedule of Stock Option Activity and Other Stock Option Information
Stock Options
The table below sets forth the stock option activity and other stock option information for each of the three years in the period ended December 31, 2020:
 Number of
shares		Weighted-
average
exercise price		Weighted-
average
remaining
contractual
life (years)
Aggregate
intrinsic value(1)
(in thousands)
Balance, December 31, 2017100,000 $51.95 3.1$3,763 
Grants— — 
Awards assumed through acquisition of CEC319,846 66.98 
Exercises(162,831)58.11 
Forfeitures/Expirations(769)51.96 
Balance, December 31, 2018256,246 66.80 7.011,947 
Grants— — 
Exercises(208,114)67.61 
Forfeitures/Expirations(2,036)58.38 
Balance, December 31, 201946,096 63.49 5.24,398 
Grants— — 
Exercises(20,522)60.62 
Forfeitures/Expirations— — 
Balance, December 31, 202025,574 $65.80 5.0$755 
Exercisable, December 31, 202020,954 $60.98 4.8$720 
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(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
The following table reflects the amount of stock-based compensation expense recorded in each of the expense line items for the years ended December 31, 2018, 2019, and 2020 (in thousands):
 201820192020
Instructional and support costs$2,588 $3,823 $5,111 
General and administration10,702 7,970 9,499 
Merger and integration costs2,242 367 — 
Stock-based compensation expense included in operating expense15,532 12,160 14,610 
Tax benefit3,922 3,126 3,771 
Stock-based compensation expense, net of tax$11,610 $9,034 $10,839