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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense and Related Tax Benefit
Total stock-based compensation expense and the related tax benefit were as follows:
Three Months Ended March 31,
In thousands20212020
Stock options$340 $467 
Restricted stock units5,931 7,809 
Unrestricted stock awards227 206 
Phantom stock units1,117 433 
Total stock-based compensation$7,615 $8,915 
Related tax benefit$1,363 $1,767 
Employee Stock Options Activity
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 thousands)(years)(in thousands)
Outstanding, January 1, 2020458 $56.38 7.0$12,641 
Granted73 87.27 $26.72 
Exercised(40)54.03 934 
Forfeited— 
Expired— 
Outstanding, March 31, 2020491 $61.13 7.5$3,106 
Outstanding, January 1, 2021433 $61.95 6.9$14,697 
Granted— 
Exercised(24)67.04 926 
Forfeited(4)80.90 
Outstanding, March 31, 2021405 $61.48 6.7$11,012 
Exercisable, March 31, 2021295 $55.03 5.9$9,930 
Stock Options, Valuation Assumptions
The weighted average assumptions used to estimate the fair value of stock options granted and the resulting weighted average fair value are as follows:
Three Months Ended March 31,
20212020
Expected volatility— %31.0 %
Risk-free interest rate— %1.4 %
Expected term (years)N/A5.3
Restricted Stock Units Award Activity
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, 2020684 
Granted182 $87.17 
Released (1)
(192)$12,454 
Forfeited(7)
Outstanding, March 31, 2020667 
Outstanding, January 1, 2021544 $71.79 
Granted186 100.28 
Released (1)
(177)74.10 $18,007 
Forfeited(10)74.41 
Outstanding, March 31, 2021543 81.03 
Vested but not released, March 31, 202110 $845 
(1)     Shares released is presented as gross shares and does not reflect shares withheld by us for employee payroll tax obligations.
Restricted Stock Units, Valuation Assumptions
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:
Three Months Ended March 31,
20212020
Expected volatility50.5 %37.6 %
Risk-free interest rate0.2 %1.5 %
Expected term (years)2.91.8
Weighted average fair value$113.75 $94.28