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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Stock-Based Compensation Expense | Stock-based compensation expense was as follows:
(In thousands) | 2018 |  | 2017 |  | 2016
Restricted stock | $ | 6,221 |  |  | $ | 4,691 |  |  | $ | 3,456 |
Stock options | 217 |  |  | 380 |  |  | 2,459 |
Performance stock | 5,801 |  |  | 6,687 |  |  | 3,296 |
Total compensation expense before income taxes | 12,239 |  |  | 11,758 |  |  | 9,211 |
Income tax benefit | 2,974 |  |  | 4,440 |  |  | 3,375 |
Total compensation expense, net of income tax benefit | $ | 9,265 |  |  | $ | 7,318 |  |  | $ | 5,836 |
Schedule Of Fair Value Weighted Average Assumptions For Options Granted | Stock option expense is based on the fair value of stock option grants estimated on the grant dates using the Black-Scholes option pricing model and the following weighted average assumptions for options granted in 2016. There were no stock options granted in 2018 and 2017.
| 2016
Fair value per option | $ | 11.69 |
Risk-free interest rate | 1.6 | %
Expected dividend yield | 2.8 | %
Expected volatility | 34 | %
Expected life (years) | 7.0 |
Summary Of Option Activity | A summary of option activity follows:
| Shares |  | Weighted Average Exercise Price |  | Exercisable at Year-end
Outstanding January 1, 2016 | 1,694,675 |  |  | $ | 36.69 |  |  |
Granted | 235,233 |  |  | 44.50 |  |  |
Exercised | (341,063 | ) |  | 37.34 |  |  |
Forfeited | (12,753 | ) |  | 46.11 |  |  |
Outstanding December 31, 2016 | 1,576,092 |  |  | 37.63 |  |  | 1,098,615 |
Exercised | (620,646 | ) |  | 29.75 |  |  |
Outstanding December 31, 2017 | 955,446 |  |  | 42.75 |  |  | 614,414 |
Exercised | (215,724 | ) |  | 39.25 |  |  |
Forfeited | (4,721 | ) |  | 44.50 |  |  |
Outstanding December 31, 2018 | 735,001 |  |  | $ | 43.79 |  |  | 638,673 |
Characteristics of Outstanding and Exercisable Stock Options | For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2018 were as follows:
| Stock Options Outstanding
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $33.00 | 39,485 |  |  | $ | 25.01 |  |  | 0.90
$33.01 – $45.00 | 359,713 |  |  | 40.39 |  |  | 4.32
$45.01 – $51.69 | 335,803 |  |  | 49.64 |  |  | 4.65
$17.83 – $51.69 | 735,001 |  |  | $ | 43.79 |  |  | 4.28
| Stock Options Exercisable
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $33.00 | 39,485 |  |  | $ | 25.01 |  |  | 0.90
$33.01 – $45.00 | 263,385 |  |  | 38.89 |  |  | 3.27
$45.01 – $51.69 | 335,803 |  |  | 49.64 |  |  | 4.65
$17.83 – $51.69 | 638,673 |  |  | $ | 43.68 |  |  | 3.85
Summary of Restricted Stock and Unit Activity | A summary of restricted stock and unit activity follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested January 1, 2016 | 217,709 |  |  | $ | 49.70 |
Granted | 107,465 |  |  | 50.65 |
Vested | (76,568 | ) |  | 49.12 |
Forfeited | (14,014 | ) |  | 48.23 |
Unvested at December 31, 2016 | 234,592 |  |  | 49.76 |
Granted | 72,878 |  |  | 75.27 |
Vested | (76,834 | ) |  | 52.74 |
Forfeited | (3,475 | ) |  | 50.46 |
Unvested at December 31, 2017 | 227,161 |  |  | 57.50 |
Granted | 75,430 |  |  | 87.36 |
Vested | (92,401 | ) |  | 58.10 |
Forfeited | (4,741 | ) |  | 59.61 |
Unvested at December 31, 2018 | 205,449 |  |  | $ | 68.97 |
Summary of Performance Stock Unit Activity | A summary of performance stock unit activity follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2016 | 171,644 |  |  | $ | 50.24 |
Granted | 65,355 |  |  | 44.28 |
Vested | (31,093 | ) |  | 58.54 |
Performance adjustments | (15,682 | ) |  | 58.54 |
Forfeited | (3,603 | ) |  | 44.47 |
Unvested at December 31, 2016 | 186,621 |  |  | 46.18 |
Granted | 98,886 |  |  | 72.73 |
Vested | (72,504 | ) |  | 57.19 |
Performance adjustments | 29,183 |  |  | 57.27 |
Forfeited | — |  |  | — |
Unvested at December 31, 2017 | 242,186 |  |  | 55.06 |
Granted | 62,775 |  |  | 84.79 |
Vested | (41,660 | ) |  | 40.23 |
Performance adjustments | (35,756 | ) |  | 45.21 |
Forfeited | (8,659 | ) |  | 44.53 |
Unvested at December 31, 2018 | 218,886 |  |  | $ | 68.43 |

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