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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Stock-Based Compensation Expense | Stock-based compensation expense was as follows:
(In thousands) | 2017 |  | 2016 |  | 2015
Restricted stock | $ | 4,691 |  |  | $ | 3,456 |  |  | $ | 3,035 |
Stock options | 380 |  |  | 2,459 |  |  | 2,454 |
Performance stock | 6,687 |  |  | 3,296 |  |  | 2,110 |
Total compensation expense before income taxes | 11,758 |  |  | 9,211 |  |  | 7,599 |
Income tax benefit | 4,440 |  |  | 3,375 |  |  | 2,896 |
Total compensation expense, net of income tax benefit | $ | 7,318 |  |  | $ | 5,836 |  |  | $ | 4,703 |
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 and 2015. There were no stock options granted in 2017.
| 2016 |  | 2015
Fair value per option | $ | 11.69 |  |  | $ | 15.63 |
Risk-free interest rate | 1.6 | % |  | 1.8 | %
Expected dividend yield | 2.8 | % |  | 2.3 | %
Expected volatility | 34 | % |  | 39 | %
Expected life (years) | 7.0 |  |  | 6.7 |
Summary Of Option Activity | A summary of option activity follows:
| Shares |  | Weighted Average Exercise Price |  | Exercisable at Year-end
Outstanding January 1, 2015 | 1,618,561 |  |  | $ | 35.74 |  |  |
Granted | 170,683 |  |  | 48.64 |  |  |
Exercised | (64,752 | ) |  | 38.59 |  |  |
Expired | (1,109 | ) |  | 44.36 |  |  |
Forfeited | (28,708 | ) |  | 49.71 |  |  |
Outstanding December 31, 2015 | 1,694,675 |  |  | 36.69 |  |  | 1,280,665 |
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 |
Characteristics of Outstanding and Exercisable Stock Options | For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2017 were as follows:
| Stock Options Outstanding
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $33.00 | 85,607 |  |  | $ | 23.98 |  |  | 1.82
$33.01 – $45.00 | 464,364 |  |  | 40.23 |  |  | 5.59
$45.01 – $51.69 | 405,475 |  |  | 49.61 |  |  | 5.96
$17.83 – $51.69 | 955,446 |  |  | $ | 42.75 |  |  | 5.41
| Stock Options Exercisable
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $33.00 | 85,607 |  |  | $ | 23.98 |  |  | 1.82
$33.01 – $45.00 | 260,278 |  |  | 36.88 |  |  | 3.57
$45.01 – $51.69 | 268,529 |  |  | 50.10 |  |  | 5.34
$17.83 – $51.69 | 614,414 |  |  | $ | 40.86 |  |  | 4.10
Summary of Restricted Stock and Unit Activity | A summary of restricted stock and unit activity follows:
| Shares |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2015 | 268,743 |  |  | $ | 45.34 |
Granted | 83,725 |  |  | 48.06 |
Vested | (111,834 | ) |  | 39.01 |
Forfeited | (22,925 | ) |  | 45.84 |
Unvested at December 31, 2015 | 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 |
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, 2015 | 143,961 |  |  | $ | 52.42 |
Granted | 87,256 |  |  | 41.99 |
Vested | (52,839 | ) |  | 41.75 |
Performance adjustments | 3,086 |  |  | 41.45 |
Forfeited | (9,820 | ) |  | 51.51 |
Unvested at December 31, 2015 | 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 |
Unvested at December 31, 2017 | 242,186 |  |  | $ | 55.06 |

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