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Stock Plans and Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock options and stock appreciation rights | The following table presents the activity related to stock options and SARs under all plans for the year ended December 31, 2016.
| Number of Shares/Rights |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at January 1, 2016 | 441,016 |  |  | $ | 42.46 |  |  |  |  |
Granted | 19,946 |  |  | 77.00 |  |  |  |  |
Exercised | (107,528 | ) |  | 38.77 |  |  |  |  |
Forfeited | (14,918 | ) |  | 45.00 |  |  |  |  |
Outstanding at December 31, 2016 | 338,516 |  |  | $ | 45.56 |  |  | 5.56 |  | $ | 16,582,002 |
Exercisable at December 31, 2016 | 155,046 |  |  | $ | 39.43 |  |  | 3.17 |  | $ | 8,544,305 |
Schedule of total stock options exercised | ash proceeds, tax benefits and intrinsic value related to total stock options, SARs, and restricted stock exercised is as follows:
(in thousands) | 2016 |  | 2015 |  | 2014
Net proceeds from stock option exercises | $ | (806 | ) |  | $ | 1,382 |  |  | $ | 1,512 |
Tax benefits related to stock option and SAR exercises and vesting of restricted shares | 1,433 |  |  | 358 |  |  | 234 |
Intrinsic value of stock option exercises | 3,718 |  |  | 3,014 |  |  | 2,112 |
Schedule of valuation model estimates fair value based on the assumptions | The fair values of the grants are expensed over the vesting periods.
| 2016 |  | 2015 |  | 2014
Weighted per share average fair value at grant date | $ | 12.88 |  |  | $ | 8.96 |  |  | $ | 8.32 |
Risk-free interest rate | 1.57 | % |  | 1.80 | % |  | 1.91 | %
Expected dividend yield | 3.00 | % |  | 3.80 | % |  | 5.14 | %
Volatility | 24.58 | % |  | 25.32 | % |  | 30.96 | %
Expected life (years) | 5.50 |  |  | 6.00 |  |  | 6.00 |
Schedule of options outstanding |
December 31, 2016 |  |  |  |  |  |
Options and SARs Outstanding |  | Options and SARs Exercisable
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$13.00-20.00 |  | 626 |  |  | 2.96 |  | $ | 16.47 |  |  | 626 |  |  | $ | 16.47 |
$20.01-29.30 |  | 2,985 |  |  | 4.23 |  | $ | 22.03 |  |  | 2,985 |  |  | $ | 22.03 |
$29.31-35.70 |  | 1,295 |  |  | 1.96 |  | $ | 30.96 |  |  | 1,295 |  |  | $ | 30.96 |
$35.71-37.50 |  | 99,466 |  |  | 3.07 |  | $ | 37.12 |  |  | 71,706 |  |  | $ | 37.16 |
$37.51-41.00 |  | 41,003 |  |  | 6.34 |  | $ | 40.60 |  |  | 9,755 |  |  | $ | 40.60 |
$41.01-50.00 |  | 126,295 |  |  | 5.47 |  | $ | 45.71 |  |  | 68,679 |  |  | $ | 42.76 |
$50.01-60.00 |  | 46,900 |  |  | 8.84 |  | $ | 56.29 |  |  | 0 |  |  | $ | 0 |
$60.01-86.18 |  | 19,946 |  |  | 9.86 |  | $ | 77.00 |  |  | 0 |  |  | $ | 0 |
|  | 338,516 |  |  | 5.56 |  | $ | 45.56 |  |  | 155,046 |  |  | $ | 39.43 |
Schedule of restricted stock awards | The following table presents activity related to restricted stock awards for the twelve months ended December 31, 2016.
| Number of Shares |  | Weighted Average Exercise Price
Unvested at January 1, 2016 | 247,347 |  |  | $ | 47.57 |
Granted | 53,770 |  |  | 76.93 |
Vested | (36,030 | ) |  | 73.99 |
Forfeited | (13,371 | ) |  | 46.88 |
Unvested at December 31, 2016 | 251,716 |  |  | $ | 54.46 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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