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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted stock compensation footnote | During the nine months ended September 30, 2017, the Company made the following awards of restricted stock:
Date |  | Shares Granted |  | Plan |  | Grant Date Fair Value Per Share |  | Vesting Period
2/13/2017 |  | 1,200 |  |  | 2005 Employee Stock Plan |  | $ | 62.53 |  |  | Ratably over 5 years from grant date
2/16/2017 |  | 34,150 |  |  | 2005 Employee Stock Plan |  | $ | 63.10 |  |  | Ratably over 5 years from grant date
3/31/2017 |  | 500 |  |  | 2005 Employee Stock Plan |  | $ | 65.63 |  |  | Ratably over 5 years from grant date
4/3/2017 |  | 1,500 |  |  | 2005 Employee Stock Plan |  | $ | 64.14 |  |  | Ratably over 5 years from grant date
5/15/2017 |  | 1,000 |  |  | 2005 Employee Stock Plan |  | $ | 64.03 |  |  | Ratably over 5 years from grant date
5/23/2017 |  | 7,000 |  |  | 2010 Non-Employee Director Stock Plan |  | $ | 61.95 |  |  | At the end of 5 years from grant date (1)
6/15/2017 |  | 950 |  |  | 2005 Employee Stock Plan |  | $ | 66.18 |  |  | Ratably over 5 years from grant date
(1) | These restricted stock grants will vest at the end of a five year period, or earlier if the director ceases to be a director for any reason other than cause, such as, for example, by retirement.

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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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