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Stock Options (Schedule of Restricted Stock Award Activity) (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Outstanding at beginning of year (in shares)	75,636	63,052	45,621
Granted (in shares)	36,060	35,300	33,620
Exercised (in shares)	(32,466)	(22,266)	(16,189)
Canceled (in shares)	(525)	(450)	0
Outstanding at end of year (in shares)	78,705	75,636	63,052
Grant-Date Fair Value
Outstanding at beginning of year (in dollars per share)	$ 81.39	$ 70.08	$ 54.58
Granted (in dollars per share)	105.69	92.50	84.34
Exercised (in dollars per share)	69.94	66.91	56.03
Canceled (in dollars per share)	99.96	83.99	0
Outstanding at end of year (in dollars per share)	$ 94.34	$ 81.39	$ 70.08

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
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Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options.

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- Definition

Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Per share or unit weighted-average intrinsic value of award vested under share-based payment arrangement. Excludes share and unit options.

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