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Stock Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Stock-Based Compensation Expense | Stock-based compensation expense was as follows:
(In thousands) | 2015 |  | 2014 |  | 2013
Restricted stock | $ | 3,035 |  |  | $ | 4,026 |  |  | $ | 4,129 |
Stock options | 2,454 |  |  | 2,355 |  |  | 2,825 |
Performance stock | 2,110 |  |  | 2,672 |  |  | 3,383 |
Total compensation expense before income taxes | 7,599 |  |  | 9,053 |  |  | 10,337 |
Income tax benefit | 2,896 |  |  | 3,293 |  |  | 3,810 |
Total compensation expense, net of income tax benefit | $ | 4,703 |  |  | $ | 5,760 |  |  | $ | 6,527 |
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 2015, 2014 and 2013.
| 2015 |  | 2014 |  | 2013
Fair value per option | $ | 15.63 |  |  | $ | 17.26 |  |  | $ | 14.17 |
Risk-free interest rate | 1.8 | % |  | 2.1 | % |  | 1.2 | %
Expected dividend yield | 2.3 | % |  | 2.4 | % |  | 2.8 | %
Expected volatility | 39 | % |  | 41 | % |  | 39 | %
Expected life (years) | 6.7 |  |  | 6.6 |  |  | 6.1 |
Summary Of Option Activity | A summary of option activity follows:
| Shares |  | Weighted Average Exercise Price |  | Exercisable at Year-end
Outstanding January 1, 2013 | 1,784,660 |  |  | $ | 33.05 |  |  |
Granted | 188,407 |  |  | 49.03 |  |  |
Exercised | (277,687 | ) |  | 34.72 |  |  |
Outstanding December 31, 2013 | 1,695,380 |  |  | 34.55 |  |  | 1,178,657 |
Granted | 138,519 |  |  | 51.69 |  |  |
Exercised | (190,743 | ) |  | 36.31 |  |  |
Expired | (1,071 | ) |  | 45.68 |  |  |
Forfeited | (23,524 | ) |  | 38.82 |  |  |
Outstanding December 31, 2014 | 1,618,561 |  |  | 35.74 |  |  | 1,147,712 |
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 |
Characteristics of Outstanding and Exercisable Stock Options | For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2015 were as follows:
| Stock Options Outstanding
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $29.33 | 533,382 |  |  | $ | 21.67 |  |  | 3.52
$33.55 – $40.88 | 461,108 |  |  | 36.88 |  |  | 3.92
$41.26 – $51.69 | 700,185 |  |  | 47.99 |  |  | 5.94
$17.83 – $51.69 | 1,694,675 |  |  | 36.69 |  |  | 4.62
| Stock Options Exercisable
Range of Exercise Prices | Shares |  | Weighted-Average
Exercise Price |  | Remaining Life
$17.83 – $29.33 | 533,382 |  |  | $ | 21.67 |  |  | 3.52
$33.55 – $40.88 | 461,108 |  |  | 36.88 |  |  | 3.92
$41.26 – $48.95 | 286,175 |  |  | 45.63 |  |  | 2.62
$17.83 – $48.95 | 1,280,665 |  |  | $ | 32.50 |  |  | 3.46
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, 2013 | 417,843 |  |  | $ | 31.92 |
Granted | 92,448 |  |  | 48.98 |
Vested | (197,465 | ) |  | 27.42 |
Forfeited | (9,407 | ) |  | 40.23 |
Unvested at December 31, 2013 | 303,419 |  |  | 39.79 |
Granted | 83,543 |  |  | 51.91 |
Vested | (108,245 | ) |  | 34.94 |
Forfeited | (9,974 | ) |  | 44.42 |
Unvested at December 31, 2014 | 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 |
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, 2013 | 137,672 |  |  | $ | 35.85 |
Granted | 53,357 |  |  | 57.58 |
Vested | (45,809 | ) |  | 26.08 |
Performance adjustments | 4,169 |  |  | 25.84 |
Unvested at December 31, 2013 | 149,389 |  |  | 46.32 |
Granted | 46,242 |  |  | 57.42 |
Vested | (91,696 | ) |  | 39.19 |
Performance adjustments | 41,428 |  |  | 39.42 |
Forfeited | (1,402 | ) |  | 48.85 |
Unvested at December 31, 2014 | 143,961 |  |  | 52.42 |
Granted | 87,256 |  |  | 41.99 |
Vested | (66,200 | ) |  | 41.75 |
Performance adjustments | 16,447 |  |  | 41.45 |
Forfeited | (9,820 | ) |  | 51.51 |
Unvested at December 31, 2015 | 171,644 |  |  | $ | 50.24 |

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