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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Parenthetical] - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Dividends per share (in dollars per shares) | [1] | $ 0.60 | $ 0.54
Exercise of stock options (in shares) |  | 117,919 | 7,941
Excess tax benefit related to stock option plans (in dollars) |  | $ 266 | $ 5
[1] | Per share amounts for the periods ended September 30, 2015 have been adjusted to give effect to the 5% stock dividend paid during December 2015.

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11283-113907 + Details
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