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Stock Plans and Management Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
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 $64.13, $49.12 and $59.05 for units granted in 2020, 2019 and 2018, respectively. Non-vested stock unit activity for the year ended December 31, 2020 was as follows:
(in thousands, except grant date fair value) | Non-vested Stock Unit Activity |  | Weighted Average Grant Date Fair Value ($) |  |  |  |  |  |  |  |
Non-vested units, unvested at January 1, 2020 | 444 |  |  | 53.42 |  |  |  |  |  |  |  |  |
Awarded | 272 |  |  | 64.13 |  |  |  |  |  |  |  |  |
Forfeited | (58) |  |  | 57.72 |  |  |  |  |  |  |  |  |
Vested | (87) |  |  | 58.58 |  |  |  |  |  |  |  |  |
Non-vested units, unvested at December 31, 2020 | 571 |  |  | 57.31 |  |  |  |  |  |  |  |  |
SARs and Stock Option Activity | SARs activity for all plans for the years ended December 31, 2020, 2019 and 2018, was as follows:
| 2020 |  | 2019 |  | 2018
(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 |  | SARs Outstanding |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding on January 1 | 119 |  |  | $ | 21.57 |  |  |  |  |  |  | 343 |  |  | $ | 16.04 |  |  |  |  | 594 |  |  | $ | 14.40 |  |  |
Exercised | (97) |  |  | $ | 21.16 |  |  |  |  | $ | 5,353 |  |  | (224) |  |  | $ | 13.13 |  |  | $ | 10,494 |  |  | (248) |  |  | $ | 12.10 |  |  | $ | 12,636 |
Forfeited | — |  |  | $ | 11.08 |  |  |  |  |  |  | 0 |  |  | $ | 5.86 |  |  |  |  | (3) |  |  | $ | 17.06 |  |  |
Outstanding on December 31 | 22 |  |  | $ | 23.41 |  |  | 1.1 years |  | $ | 6,276 |  |  | 119 |  |  | $ | 21.57 |  |  | $ | 4,571 |  |  | 343 |  |  | $ | 16.04 |  |  | $ | 10,439 |
Exercisable and Vested on December 31 | 22 |  |  | $ | 23.41 |  |  | 1.1 years |  | $ | 6,276 |  |  | 119 |  |  | $ | 21.57 |  |  | $ | 4,571 |  |  | 343 |  |  | $ | 16.04 |  |  | $ | 10,439 |
SARs and Stock Options Outstanding | The following table summarizes information about SARs outstanding as of December 31, 2020:
|  | Outstanding and Exercisable
Exercise Price |  | Number (in thousands) |  | Weighted Average Remaining Years of Contractual Life
$14.68 |  | 0.6 |  |  | 0.7 | years
$21.52 |  | 1.4 |  |  | 0.1 | years
$23.79 |  | 19.7 |  |  | 1.1 | years
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 2020, 2019 and 2018 were $64.72, $49.64 and $61.59, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
| 2020 |  | 2019 |  | 2018 |  |  |
Risk-free interest rate | 1.4 | % |  | 2.9 | % |  | 2.4 | % |  |  |
Dividend yield | 1.5 | % |  | 1.7 | % |  | 1.3 | % |  |  |
Volatility factor | 46.6 | % |  | 41.0 | % |  | 38.9 | % |  |  |
Expected life of award | 2.9 years |  | 2.9 years |  | 2.9 years |  |  |
Performance Award Activity | Performance award activity for the year ended December 31, 2020 was as follows:
(in thousands, except grant date fair value) | Performance Awards |  | Weighted Average Grant Date Fair Value ($) |  |
Performance awards, unvested at January 1 | 88 |  |  | 53.55 |  |  |
Awarded | 116 |  |  | 63.13 |  |  |
Forfeited | (37) |  |  | 57.71 |  |  |
Vested and earned | 45 |  |  | 42.34 |  |  |
Performance awards, unvested at December 31 | 212 |  |  | 55.71 |  |  |

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