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Stock Plans and Stock Based Compensation - Options and SARs Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number Outstanding (in shares) | shares	157,622
Weighted Average Remaining Contractual Life	4 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share)	$ 49.72
Number Exercisable (in shares) | shares	103,927
Weighted Average Exercise Price (in dollars per share)	$ 46.91
$35.71-37.50
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, lower range (in dollars per share)	35.71
Range of exercise prices, upper range (in dollars per share)	$ 37.50
Number Outstanding (in shares) | shares	31,680
Weighted Average Remaining Contractual Life	1 year 7 months 13 days
Weighted Average Exercise Price (in dollars per share)	$ 37.00
Number Exercisable (in shares) | shares	31,680
Weighted Average Exercise Price (in dollars per share)	$ 37.00
$37.51-41.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, lower range (in dollars per share)	37.51
Range of exercise prices, upper range (in dollars per share)	$ 41.0
Number Outstanding (in shares) | shares	28,155
Weighted Average Remaining Contractual Life	3 years 3 months 10 days
Weighted Average Exercise Price (in dollars per share)	$ 40.60
Number Exercisable (in shares) | shares	21,500
Weighted Average Exercise Price (in dollars per share)	$ 40.60
$41.01-50.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, lower range (in dollars per share)	41.01
Range of exercise prices, upper range (in dollars per share)	$ 50.00
Number Outstanding (in shares) | shares	47,195
Weighted Average Remaining Contractual Life	4 years 10 months 9 days
Weighted Average Exercise Price (in dollars per share)	$ 49.22
Number Exercisable (in shares) | shares	28,226
Weighted Average Exercise Price (in dollars per share)	$ 49.22
$50.01-76.90
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, lower range (in dollars per share)	50.01
Range of exercise prices, upper range (in dollars per share)	$ 76.90
Number Outstanding (in shares) | shares	50,370
Weighted Average Remaining Contractual Life	6 years 1 month 24 days
Weighted Average Exercise Price (in dollars per share)	$ 63.12
Number Exercisable (in shares) | shares	22,410
Weighted Average Exercise Price (in dollars per share)	$ 63.87
$76.91-86.18
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Range of exercise prices, lower range (in dollars per share)	76.91
Range of exercise prices, upper range (in dollars per share)	$ 86.18
Number Outstanding (in shares) | shares	222
Weighted Average Remaining Contractual Life	6 years 10 months 20 days
Weighted Average Exercise Price (in dollars per share)	$ 86.18
Number Exercisable (in shares) | shares	111
Weighted Average Exercise Price (in dollars per share)	$ 86.18

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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