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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted stock compensation footnote | During the nine months ended September 30, 2016, the Company made the following awards of restricted stock:
Date |  | Shares Granted |  | Plan |  | Grant Date Fair Value Per Share |  | Vesting Period
2/11/2016 |  | 51,475 |  |  | 2005 Employee Stock Plan |  | $ | 41.96 |  |  | Ratably over 5 years from grant date
3/1/2016 |  | 600 |  |  | 2005 Employee Stock Plan |  | $ | 44.37 |  |  | Ratably over 5 years from grant date
5/24/2016 |  | 8,700 |  |  | 2010 NonEmployee Director Stock Plan |  | $ | 48.34 |  |  | Cliff vest 5 years from grant date
9/19/2016 |  | 800 |  |  | 2005 Employee Stock Plan |  | $ | 52.92 |  |  | Ratably over 5 years from grant date
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The Company has made the following awards of nonqualified options to purchase shares of common stock during the nine months ended September 30, 2016:
| Nine Months Ended
| September 30, 2016
Date of grant | 7/14/2016 |  | 2/20/2016 |
Plan | 2010 |  | 2010 |
Options granted | 5,000 |  | 5,000 |
Vesting period (beginning on grant date) | 18 months |  | 22 months |
Expiration date | 7/14/2026 |  | 2/20/2026 |
Expected volatility | 32.28 | % | 32.44 | %
Expected life (years) | 5.5 |  | 5.5 |
Expected dividend yield | 2.37 | % | 2.28 | %
Risk free interest rate | 1.14 | % | 1.29 | %
Fair value per option | $ | 11.46 |  | $ | 10.59 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -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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