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Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Other Employee Benefit Plans [Abstract] |
Schedule of shares purchased in the open market for employees |
|  |  |  | Shares purchased |  |  |  | Average price per share
2013 |  |  |  | 8,911 |  |  |  | $ | 42.27
2014 |  |  |  | 5,872 |  |  |  | $ | 44.55
2015 |  |  |  | 5,136 |  |  |  | $ | 49.10

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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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