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Share-Based Compensation Plans (Company's Shareholder Approved Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-Based Compensation Plans [Abstract]
Outstanding at January 1, Shares	116,871	170,704	279,164
Granted, Shares		0
Exercised, Shares	67,843	53,833	108,460
Forfeited/Cancelled/Expired, Shares
Outstanding at December 31, Shares	49,028	116,871	170,704
Exercisable at December 31, Shares	49,028	116,871	170,704
Outstanding at January 1, Weighted-Average Exercise Price/Share	$ 87.87	$ 87.18	$ 83.84
Granted - Weighted- Average Exercise Price/Share	0
Exercised, Weighted- Average Exercise Price/Share	87.39	85.69	78.58
Forfeited/Cancelled/Expired, Weighted- Average Exercise Price/Share
Outstanding at December 31, Weighted-Average Exercise Price/Share	88.52	87.87	87.18
Exercisable at December 31, Weighted-Average Exercise Price/Share	$ 88.52	$ 87.87	$ 87.18
Outstanding at December 31, Weighted-Average Remaining Contractual Term	2 months 12 days	8 months 12 days	1 year 4 months 24 days
Exercisable at December 31, Weighted-Average Remaining Contractual Term	2 months 12 days	8 months 12 days	1 year 4 months 24 days
Outstanding at December 31, Aggregate Intrinsic Value	$ 9,090	$ 17,089	$ 32,376
Exercisable at December 31, Aggregate Intrinsic Value	$ 9,090	$ 17,089	$ 32,376

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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.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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 vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Number of share options (or share units) exercised during the current period.

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