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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
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 thousands | 2020 |  | 2019 |  | 2018
Stock options | $ | 1,944 |  |  | $ | 1,770 |  |  | $ | 3,675 |
Restricted stock units | 22,285 |  |  | 24,560 |  |  | 26,859 |
Unrestricted stock awards | 824 |  |  | 630 |  |  | 729 |
Phantom stock units | 3,720 |  |  | 3,301 |  |  | 2,165 |
Total stock-based compensation | $ | 28,773 |  |  | $ | 30,261 |  |  | $ | 33,428 |
Related tax benefit | $ | 5,086 |  |  | $ | 5,390 |  |  | $ | 6,019 |
Employee Stock Options Activity | A summary of our stock option activity is as follows:
| Shares |  | Weighted 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, 2018 | 956 |  |  | $ | 47.10 |  |  | 6.3 |  | $ | 21,965 |  |  |
Converted upon acquisition | 42 |  |  | 51.86 |  |  |  |  |  |  | $ | 14.86 |
Granted | 122 |  |  | 68.21 |  |  |  |  |  |  | 24.29 |
Exercised | (152) |  |  | 38.99 |  |  |  |  | 4,520 |  |  |
Forfeited | (7) |  |  | 60.03 |  |  |  |  |  |  |
Expired | (66) |  |  | 95.31 |  |  |  |  |  |  |
Outstanding, December 31, 2018 | 895 |  |  | $ | 47.93 |  |  | 6.2 |  | $ | 4,806 |  |  |
Granted | 76 |  |  | 76.55 |  |  |  |  |  |  | $ | 26.20 |
Exercised | (489) |  |  | 43.55 |  |  |  |  | 15,759 |  |  |
Forfeited | (13) |  |  | 67.34 |  |  |  |  |  |  |
Expired | (11) |  |  | 66.24 |  |  |  |  |  |  |
Outstanding, December 31, 2019 | 458 |  |  | $ | 56.38 |  |  | 7.0 |  | $ | 12,641 |  |  |
Granted | 83 |  |  | 84.39 |  |  |  |  |  |  | $ | 26.37 |
Exercised | (103) |  |  | 53.99 |  |  |  |  | 2,061 |  |  |
Forfeited | (5) |  |  | 83.94 |  |  |  |  |  |  |
Outstanding, December 31, 2020 | 433 |  |  | $ | 61.95 |  |  | 6.9 |  | $ | 14,697 |  |  |
Exercisable, December 31, 2020 | 268 |  |  | $ | 51.85 |  |  | 5.8 |  | $ | 11,810 |  |  |
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,
| 2020 |  | 2019 |  | 2018
Expected volatility | 32.3 | % |  | 31.7 | % |  | 30.5 | %
Risk-free interest rate | 1.3 | % |  | 1.7 | % |  | 2.8 | %
Expected term (years) | 5.3 |  | 6.1 |  | 6.1
Restricted Stock Units Award Activity | The following table summarizes restricted stock unit activity:
| Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
| In thousands |  |  |  | In thousands
Outstanding, January 1, 2018 | 556 |  |  | $ | 47.68 |  |  |
Converted upon acquisition | 579 |  |  | 69.40 |  |  |
Granted | 387 |  |  | 57.48 |  |  |
Released (1) | (593) |  |  |  |  | $ | 32,567 |
Forfeited | (112) |  |  |  |  |
Outstanding, December 31, 2018 | 817 |  |  | $ | 59.70 |  |  |
Granted | 404 |  |  | 62.97 |  |  |
Released (1) | (471) |  |  |  |  | $ | 29,304 |
Forfeited | (66) |  |  |  |  |
Outstanding, December 31, 2019 | 684 |  |  | $ | 64.38 |  |  |
Granted | 262 |  |  | 83.42 |  |  |
Released (1) | (363) |  |  | 65.25 |  |  | $ | 23,702 |
Forfeited | (39) |  |  | 71.96 |  |  |
Outstanding, December 31, 2020 | 544 |  |  | $ | 71.79 |  |  |
Vested but not released, December 31, 2020 | 50 |  |  |  |  | $ | 4,836 |
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,
| 2020 |  | 2019 |  | 2018
Expected volatility | 44.9 | % |  | 31.4 | % |  | 28.0 | %
Risk-free interest rate | 1.0 | % |  | 2.5 | % |  | 2.2 | %
Expected term (years) | 1.8 |  | 1.6 |  | 2.1
Weighted average fair value | $ | 93.97 |  |  | $ | 61.25 |  |  | $ | 78.56 |
Schedule of Other Share-based Compensation, Activity | The following table summarizes phantom stock unit activity:
| Number of Phantom Stock Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
| In thousands |  |  |  | In thousands
Outstanding, January 1, 2018 | 63 |  |  | $ | 62.53 |  |  |
Converted upon acquisition | 21 |  |  |  |  |
Granted | 41 |  |  | 66.67 |  |  |
Released | (35) |  |  |  |  | $ | 2,409 |
Forfeited | (7) |  |  |  |  |
Outstanding, December 31, 2018 | 83 |  |  | $ | 61.80 |  |  |
Converted upon acquisition | — |  |  |  |  |
Granted | 55 |  |  | 60.49 |  |  |
Released | (42) |  |  |  |  | $ | 2,625 |
Forfeited | (7) |  |  |  |  |
Outstanding, December 31, 2019 | 89 |  |  | $ | 62.85 |  |  |
Granted | 38 |  |  | 87.27 |  |  |
Released | (40) |  |  | 63.87 |  |  | $ | 2,971 |
Forfeited | (5) |  |  | 70.99 |  |  |
Outstanding, December 31, 2020 | 82 |  |  | $ | 73.13 |  |  |

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