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Share-based Compensation (Summary of Stock Options Activity) (Details) - Stock Options [Member] - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding at beginning of period	61	97
Shares, Exercised	(16)	(24)
Shares, Forfeited		(6)
Shares, Outstanding at end of the period	45	67
Shares, Exercisable at end of the period	35	48
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 48.19	$ 52.53
Weighted-Average Exercise Price, Exercised	49.69	58.80
Weighted-Average Exercise Price, Forfeited		68.84
Weighted-Average Exercise Price, Outstanding at end of the period	47.66	48.71
Weighted-Average Exercise Price, Exercisable at end of the period	$ 42.00	$ 40.83

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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.

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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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