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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
We grant stock-based compensation awards, including restricted stock units, phantom stock, and unrestricted stock units, under the Second Amended and Restated 2010 Stock Incentive Plan (Stock Incentive Plan). Prior to December 31, 2020, stock options were also granted as part of the stock-based compensation awards. In the Stock Incentive Plan, we have 13,991,273 shares of common stock authorized for issuance subject to stock splits, dividends, and other similar events, and at September 30, 2024, 4,590,911 shares were available for grant. We issue new shares of common stock upon the exercise of stock options or when vesting conditions on restricted stock units are fully satisfied. These shares are subject to a fungible share provision such that the authorized share available for grant under the Plan is reduced by (i) one share for every one share subject to a stock option or share appreciation right granted and (ii) 1.7 shares for every one share of common stock that was subject to an award other than an option or share appreciation right.

We also award phantom stock units, which are settled in cash upon vesting and accounted for as liability-based awards, with no impact to the shares available for grant.

In addition, we maintain the Employee Stock Purchase Plan (ESPP), for which 486,098 shares of common stock were available for future issuance at September 30, 2024.

ESPP activity and stock-based grants other than stock options and restricted stock units were not significant for the three and nine months ended September 30, 2024 and 2023.

Stock-Based Compensation Expense
Total stock-based compensation expense and the related tax benefit were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
In thousands2024202320242023
Stock options$— $18 $— $98 
Restricted stock units9,886 6,581 31,059 19,680 
Unrestricted stock awards336 238 1,008 753 
Phantom stock units1,616 1,190 4,378 3,114 
Total stock-based compensation$11,838 $8,027 $36,445 $23,645 
Related tax benefit$2,503 $1,686 $7,853 $5,059 
Stock Options
A summary of our stock option activity is as follows:
SharesWeighted
Average Exercise
Price per Share		Weighted Average
Remaining
Contractual Life		Aggregate
Intrinsic Value		Weighted
Average Grant
Date Fair Value
In thousandsYearsIn thousands
Outstanding, January 1, 2023381 $60.63 4.8$1,892 
Granted— — $— 
Exercised(6)56.83 88 
Forfeited— — 
Canceled— — 
Outstanding, September 30, 2023375 $60.69 4.1$3,316 
Outstanding, January 1, 2024363 $61.36 4.0$5,886 
Granted— — $— 
Exercised(26)54.19 935 
Forfeited— — 
Canceled— — 
Outstanding, September 30, 2024337 $61.92 3.2$15,111 
Exercisable, September 30, 2024337 $61.92 3.2$15,111 

At September 30, 2024, all stock-based compensation expense related to nonvested stock options has been recognized.

Restricted Stock Units
The following table summarizes restricted stock unit activity:
In thousands, except fair valueNumber of
Restricted Stock Units		Weighted
Average Grant
Date Fair Value		Aggregate
Intrinsic Value
Outstanding, January 1, 2023528 
Granted459 $56.62 
Released (1)
(235)$739 
Forfeited(25)
Outstanding, September 30, 2023727 
Outstanding, January 1, 2024751 $58.89 
Granted415 76.24 
Released (1)
(405)62.51 $33,372 
Forfeited(21)64.45 
Outstanding, September 30, 2024740 67.13 
Vested but not released, September 30, 202417 $1,841 

(1) Shares released is presented as gross shares and does not reflect shares withheld by us for employee payroll tax obligations.

At September 30, 2024, total unrecognized compensation expense on restricted stock units was $51.9 million, which is expected to be recognized over a weighted average period of approximately 1.7 years.
The weighted average assumptions used to estimate the fair value of performance-based restricted stock units granted with a service and market condition and the resulting weighted average fair value are as follows:
Nine Months Ended September 30,
20242023
Expected volatility45.7 %50.0 %
Risk-free interest rate4.4 %4.6 %
Expected term (years)2.92.2
Weighted average fair value$83.26 $59.52