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Stock-Based Compensation (Tables) | 3 Months Ended
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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 thousands |  |  |  |  | 2021 |  | 2020
Stock options |  |  |  |  | $ | 340 |  |  | $ | 467 |
Restricted stock units |  |  |  |  | 5,931 |  |  | 7,809 |
Unrestricted stock awards |  |  |  |  | 227 |  |  | 206 |
Phantom stock units |  |  |  |  | 1,117 |  |  | 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:
| 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, 2020 | 458 |  |  | $ | 56.38 |  |  | 7.0 |  | $ | 12,641 |  |  |
Granted | 73 |  |  | 87.27 |  |  |  |  |  |  | $ | 26.72 |
Exercised | (40) |  |  | 54.03 |  |  |  |  | 934 |  |  |
Forfeited | — |  |  |  |  |  |  |  |  |
Expired | — |  |  |  |  |  |  |  |  |
Outstanding, March 31, 2020 | 491 |  |  | $ | 61.13 |  |  | 7.5 |  | $ | 3,106 |  |  |
Outstanding, January 1, 2021 | 433 |  |  | $ | 61.95 |  |  | 6.9 |  | $ | 14,697 |  |  |
Granted | — |  |  |  |  |  |  |  |  |
Exercised | (24) |  |  | 67.04 |  |  |  |  | 926 |  |  |
Forfeited | (4) |  |  | 80.90 |  |  |  |  |  |  |
Outstanding, March 31, 2021 | 405 |  |  | $ | 61.48 |  |  | 6.7 |  | $ | 11,012 |  |  |
Exercisable, March 31, 2021 | 295 |  |  | $ | 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,
|  |  |  |  | 2021 |  | 2020
Expected volatility |  |  |  |  | — | % |  | 31.0 | %
Risk-free interest rate |  |  |  |  | — | % |  | 1.4 | %
Expected term (years) |  |  |  |  | N/A |  | 5.3
Restricted Stock Units Award Activity | The following table summarizes restricted stock unit activity:
In thousands, except fair value | Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Outstanding, January 1, 2020 | 684 |  |  |  |  |
Granted | 182 |  |  | $ | 87.17 |  |  |
Released (1) | (192) |  |  |  |  | $ | 12,454 |
Forfeited | (7) |  |  |  |  |
Outstanding, March 31, 2020 | 667 |  |  |  |  |
Outstanding, January 1, 2021 | 544 |  |  | $ | 71.79 |  |  |
Granted | 186 |  |  | 100.28 |  |  |
Released (1) | (177) |  |  | 74.10 |  |  | $ | 18,007 |
Forfeited | (10) |  |  | 74.41 |  |  |
Outstanding, March 31, 2021 | 543 |  |  | 81.03 |  |  |
Vested but not released, March 31, 2021 | 10 |  |  |  |  | $ | 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,
|  |  |  |  | 2021 |  | 2020
Expected volatility |  |  |  |  | 50.5 | % |  | 37.6 | %
Risk-free interest rate |  |  |  |  | 0.2 | % |  | 1.5 | %
Expected term (years) |  |  |  |  | 2.9 |  | 1.8
Weighted average fair value |  |  |  |  | $ | 113.75 |  |  | $ | 94.28 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock units, including, but not limited to: (a) expected term of stock units, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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