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Stock Plans and Management Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Non-Vested Stock Award Activity | The weighted average price per Non-vested stock unit at grant date was $91.14, $64.13 and $49.12 for units granted in 2021, 2020 and 2019, respectively. Non-vested stock unit activity for the year ended December 31, 2021 was as follows:
(in thousands, except grant date fair value) | Non-vested Stock Unit Activity |  | Weighted Average Grant Date Fair Value ($) |  |  |  |  |  |  |  |
Non-vested units, unvested as of January 1, 2021 | 571 |  |  | 57.31 |  |  |  |  |  |  |  |  |
Awarded | 190 |  |  | 91.14 |  |  |  |  |  |  |  |  |
Forfeited | (14) |  |  | 66.39 |  |  |  |  |  |  |  |  |
Vested | (112) |  |  | 59.71 |  |  |  |  |  |  |  |  |
Non-vested units, unvested as of December 31, 2021 | 635 |  |  | 66.81 |  |  |  |  |  |  |  |  |
SARs and Stock Option Activity | SARs activity for all plans for the years ended December 31, 2021, 2020 and 2019, was as follows:
| 2021 |  | 2020
(in thousands, except exercise price and terms) | SARs Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value |  | SARs Outstanding |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding on January 1 | 22 |  |  | $ | 23.41 |  |  |  |  |  |  | 119 |  |  | $ | 21.57 |  |  |
Exercised | (16) |  |  | $ | 23.28 |  |  |  |  | $ | 1,255 |  |  | (97) |  |  | $ | 21.16 |  |  | $ | 5,353 |
Forfeited | — |  |  | $ | — |  |  |  |  |  |  | — |  |  | $ | 11.08 |  |  |
Outstanding on December 31 | 6 |  |  | $ | 23.79 |  |  | 0.1 years |  | $ | 1,693 |  |  | 22 |  |  | $ | 23.41 |  |  | $ | 6,276 |
Exercisable and Vested on December 31 | 6 |  |  | $ | 23.79 |  |  | 0.1 years |  | $ | 1,693 |  |  | 22 |  |  | $ | 23.41 |  |  | $ | 6,276 |
| 2019
(in thousands, except exercise price and terms) | SARs Outstanding |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding on January 1 | 343 |  |  | $ | 16.04 |  |  |
Exercised | (224) |  |  | $ | 13.13 |  |  | $ | 10,494 |
Forfeited | — |  |  | $ | 5.86 |  |  |
Outstanding on December 31 | 119 |  |  | $ | 21.57 |  |  | $ | 4,571 |
Exercisable and Vested on December 31 | 119 |  |  | $ | 21.57 |  |  | $ | 4,571 |
Fair Value Assumptions for Performance Awards | The fair values of the senior executives' performance share award grants with a TSR modifier at the grant date in 2021, 2020 and 2019 were $91.44, $64.72 and $49.64, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
| 2021 |  | 2020 |  | 2019 |  |  |
Risk-free interest rate | 0.2 | % |  | 1.4 | % |  | 2.9 | % |  |  |
Dividend yield | 1.2 | % |  | 1.5 | % |  | 1.7 | % |  |  |
Volatility factor | 65.6 | % |  | 46.6 | % |  | 41.0 | % |  |  |
Expected life of award | 2.9 years |  | 2.9 years |  | 2.9 years |  |  |
Performance Award Activity | Performance award activity for the year ended December 31, 2021 was as follows:
(in thousands, except grant date fair value) | Performance Awards |  | Weighted Average Grant Date Fair Value ($) |  |
Performance awards, unvested at January 1 | 212 |  |  | 55.71 |  |  |
Awarded | 166 |  |  | 76.89 |  |  |
Forfeited | (1) |  |  | 87.48 |  |  |
Vested and earned | (185) |  |  | 53.35 |  |  |
Performance awards, unvested at December 31 | 192 |  |  | 76.15 |  |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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