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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Stock-Based Compensation Expense and Related Tax Benefit
Total stock-based compensation expense and the related tax benefit were as follows:
Year Ended December 31,
In thousands201920182017
Stock options$1,770  $3,675  $2,695  
Restricted stock units24,560  26,859  17,738  
Unrestricted stock awards630  729  974  
Phantom stock units3,301  2,165  1,747  
Total stock-based compensation$30,261  $33,428  $23,154  
Related tax benefit$5,390  $6,019  $5,034  
Employee Stock Options Activity
A summary of our stock option activity is as follows:
SharesWeighted Average Exercise Price per ShareWeighted Average Remaining Contractual LifeAggregate Intrinsic ValueWeighted Average Grant Date Fair Value
In thousandsYearsIn thousands
Outstanding, January 1, 2017959  $45.64  6.6$19,125  
Granted135  65.94  $21.99  
Exercised(41) 39.92  $1,071  
Forfeited(35) 47.38  
Expired(62) 70.12  
Outstanding, December 31, 2017956  $47.10  6.3$21,965  
Converted upon acquisition42  $51.86  $14.86  
Granted122  68.21  $24.29  
Exercised(152) 38.99  $4,520  
Forfeited(7) 60.03  
Expired(66) 95.31  
Outstanding, December 31, 2018895  $47.93  6.2$4,806  
Granted76  $76.55  $26.20  
Exercised(489) 43.55  $15,759  
Forfeited(13) 67.34  
Expired(11) 66.24  
Outstanding, December 31, 2019458  $56.38  7.0$12,641  
Exercisable, December 31, 2019272  $46.37  5.8$10,223  
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:
Year Ended December 31,
201920182017
Expected volatility31.7 %30.5 %32.5 %
Risk-free interest rate1.7 %2.8 %2.0 %
Expected term (years)6.16.15.5
Restricted Stock Units Award Activity
The following table summarizes restricted stock unit activity:
Number of Restricted Stock UnitsWeighted Average Grant Date Fair ValueAggregate Intrinsic Value
In thousandsIn thousands
Outstanding, January 1, 2017701  
Granted273  $50.95  
Released(372) $14,219  
Forfeited(46) 
Outstanding, December 31, 2017556  $47.68  
Converted upon acquisition579  $69.40  
Granted387  $57.48  
Released(593) $32,567  
Forfeited(112) 
Outstanding, December 31, 2018817  $59.70  
Granted404  $62.97  
Released(471) $62.28  $29,304  
Forfeited(66) $66.12  
Outstanding, December 31, 2019684  $64.38  
Vested but not released, December 31, 201972  $6,037  
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:
Year Ended December 31,
201920182017
Expected volatility31.4 %28.0 %28.0 %
Risk-free interest rate2.5 %2.2 %1.0 %
Expected term (years)1.62.11.7
Weighted average grant date fair value$61.25  $78.56  $77.75  
Schedule of Other Share-based Compensation, Activity
The following table summarizes phantom stock unit activity:

Number of Phantom Stock UnitsWeighted
Average Grant
Date Fair Value		Aggregate Intrinsic Value
In thousandsIn thousands
Outstanding, January 1, 201762  
Granted32  $65.55  
Released(20) $1,310  
Forfeited(11) 
Outstanding, December 31, 201763  
Outstanding, January 1, 201863  
Converted upon acquisition21  
Granted41  $66.67  
Released(35) $2,409  
Forfeited(7) 
Outstanding, December 31, 201883  
Outstanding, January 1, 201983  $61.80  
Granted55  $60.49  
Released(42) $57.13  $2,625  
Forfeited(7) $66.09  
Outstanding, December 31, 201989  $62.85