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Stock Plans and Management Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Non-Vested Stock Award Activity | The weighted average price per Non-vested stock award at grant date was $49.12, $59.05 and $60.30 for awards granted in 2019, 2018 and 2017, respectively. Non-vested stock award activity for the year ended December 31, 2019 was as follows:
(in thousands, except grant date fair value) | Non-vested Stock Award Activity |  | Weighted Average Grant Date Fair Value ($)
Non-vested awards, unvested at January 1, 2019 | 574 |  |  | 54.82 |
Awarded | 374 |  |  | 49.12 |
Forfeited | (183 | ) |  | 41.45 |
Vested | (321 | ) |  | 57.74 |
Non-vested awards, unvested at December 31, 2019 | 444 |  |  | 53.42 |
SARs and Stock Option Activity | SARs activity for all plans for the years ended December 31, 2019, 2018 and 2017, was as follows:
| 2019 |  | 2018 |  | 2017
(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 | 343 |  |  | $ | 16.04 |  |  |  |  |  |  | 594 |  |  | $ | 14.40 |  |  |  |  | 978 |  |  | $ | 14.43 |  |  |
Exercised | (224 | ) |  | $ | 13.13 |  |  |  |  | $ | 10,494 |  |  | (248 | ) |  | $ | 12.10 |  |  | $ | 12,636 |  |  | (352 | ) |  | $ | 14.37 |  |  | $ | 16,071 |
Forfeited | 0 |  |  | $ | 5.86 |  |  |  |  |  |  | (3 | ) |  | $ | 17.06 |  |  |  |  | (32 | ) |  | $ | 15.76 |  |  |
Outstanding on December 31 | 119 |  |  | $ | 21.57 |  |  | 1.4 years |  | $ | 4,571 |  |  | 343 |  |  | $ | 16.04 |  |  | $ | 10,439 |  |  | 594 |  |  | $ | 14.40 |  |  | $ | 24,261 |
Exercisable and Vested on December 31 | 119 |  |  | $ | 21.57 |  |  | 1.4 years |  | $ | 4,571 |  |  | 343 |  |  | $ | 16.04 |  |  | $ | 10,439 |  |  | 594 |  |  | $ | 14.40 |  |  | $ | 24,261 |
SARs and Stock Options Outstanding | The following table summarizes information about SARs outstanding as of December 31, 2019:
|  | Outstanding and Exercisable
Exercise Price |  | Number (in thousands) |  | Weighted Average Remaining Years of Contractual Life
$11.08 |  | 2.8 |  |  | 0.1 | years
$14.68 |  | 7.4 |  |  | 1.7 | years
$21.52 |  | 71.1 |  |  | 1.1 | years
$23.79 |  | 37.6 |  |  | 2.1 | 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 2019, 2018 and 2017 were $49.64, $61.59 and $64.82, respectively, which were estimated using the Monte Carlo valuation model, and incorporated the following assumptions:
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.9 | % |  | 2.4 | % |  | 1.5 | %
Dividend yield | 1.7 | % |  | 1.3 | % |  | 1.1 | %
Volatility factor | 41.0 | % |  | 38.9 | % |  | 38.3 | %
Expected life of award | 2.9 years |  |  | 2.9 years |  |  | 2.9 years |
Performance Award Activity | Performance award activity for the year ended December 31, 2019 was as follows:
(in thousands, except grant date fair value) | Performance Awards |  | Weighted Average Grant Date Fair Value ($)
Performance awards, unvested at January 1 | 91 |  |  | 61.32 |
Awarded | 137 |  |  | 48.92 |
Forfeited | (59 | ) |  | 49.30 |
Vested and earned | (81 | ) |  | 57.49 |
Performance awards, unvested at December 31 | 88 |  |  | 53.55 |

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