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Equity Awards (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Restricted Stock And Restricted Stock Units Activity
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, 2023:
 Number of
shares or units		Weighted-
average
grant price
Balance, December 31, 2020494,969 $117.91 
Grants321,965 88.02 
Vested shares(77,586)92.38 
Forfeitures(31,807)121.80 
Balance, December 31, 2021707,541 106.93 
Grants534,652 50.72 
Vested shares(139,375)95.27 
Forfeitures(31,257)62.43 
Balance, December 31, 20221,071,561 81.70 
Grants271,576 93.93 
Vested shares(154,764)124.19 
Forfeitures(97,251)74.03 
Balance, December 31, 20231,091,122 $80.08 
Schedule of Stock Option Activity and Other Stock Option Information
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, 2023:
 Number of
shares		Weighted-
average
exercise price		Weighted-
average
remaining
contractual
life (years)
Aggregate
intrinsic value(1)
(in thousands)
Balance, December 31, 202025,574 $65.80 5.0$755 
Grants— — 
Exercises(1,632)69.44 
Forfeitures/Expirations(266)87.66 
Balance, December 31, 202123,676 65.30 4.093 
Grants— — 
Exercises(377)36.87 
Forfeitures/Expirations— — 
Balance, December 31, 202223,299 65.76 3.0352 
Grants— — 
Exercises(4,138)53.95 
Forfeitures/Expirations— — 
Balance, December 31, 202319,161 $68.32 2.2$461 
Exercisable, December 31, 202319,161 $68.32 2.2$461 
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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, 2021, 2022, and 2023 (in thousands):
 202120222023
Instructional and support costs$5,317 $7,026 $5,804 
General and administration13,535 14,766 13,461 
Restructuring costs(703)— 507 
Stock-based compensation expense included in operating expense18,149 21,792 19,772 
Tax benefit4,809 5,488 5,156 
Stock-based compensation expense, net of tax$13,340 $16,304 $14,616