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Stock Award Plans, Director Plan Outstanding and Exercisable Options (Details) - Director Plan [Member] - Stock Options [Member]	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
First Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	$ 41.24
Range of Exercise Prices, upper limit (in dollars per share)	$ 56.45
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	25,276
Weighted Average Remaining Contractual Life	9 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 49.23
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	25,276
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 49.23
Second Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	61.89
Range of Exercise Prices, upper limit (in dollars per share)	$ 62.48
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	22,000
Weighted Average Remaining Contractual Life	2 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 62.21
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	22,000
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 62.21
Third Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	70.65
Range of Exercise Prices, upper limit (in dollars per share)	$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	68,480
Weighted Average Remaining Contractual Life	4 years 4 months 24 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 86.39
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	67,817
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 86.41
Full Exercise Price Range [Member]
Outstanding and Exercisable Stock options [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)	41.24
Range of Exercise Prices, upper limit (in dollars per share)	$ 99.52
Options Outstanding [Abstract]
Number Outstanding (in shares) | shares	115,756
Weighted Average Remaining Contractual Life	3 years 3 months 18 days
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 73.68
Aggregate Intrinsic Value, Options Outstanding | $	$ 2,134,000
Options Exercisable [Abstract]
Number Exercisable (in shares) | shares	115,093
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 73.62
Aggregate Intrinsic Value, Options Exercisable | $	$ 2,131,000

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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