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Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Schedule of Shares Purchased in the Open Market For Employees

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​	​	​	​	​	​
​		Shares		Average price
​	​	purchased	​	per share
2017		4,718	​	$	77.05
2018		4,647	​	$	100.34
2019		4,918	​	$	126.83

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- References

No definition available.

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- Definition

Tabular disclosure of employee stock purchase plan activity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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