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Consolidated Statements of Stockholders' Equity [Parenthetical] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends per share (in dollars per share)	$ 0.72	$ 0.69	$ 0.66
Exercise of stock options (in shares)	30,543	34,394	69,062
Excess tax benefit related to stock option plans (in dollars)	$ 83	$ 26	$ 29
Stock Dividend Percentage	5.00%	5.00%	5.00%
Stock Dividends (in shares)	167,250	158,444	149,240

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- Definition

The percentage rate used to calculate stock dividend payments.

+ References

No definition available.

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Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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-Publisher FASB
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 20
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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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