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Share-Based Payments (Summary of Stock Option Transactions under Share-Based Payment Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Outstanding at December 31, 2019, number of shares	26,823
Granted in 2020, numbers of shares	0
Exercised in 2020, number of shares	26,823
Forfeited or expired in 2020, number of shares	0
Outstanding at December 31, 2020, number of shares	0	26,823
Exercisable at December 31, 2020, number of shares	0
Outstanding at December 31, 2019, weighted average exercise price	$ 16.71
Granted in 2020, weighted average exercise price	0
Exercised in 2020, weighted average exercise price	16.71
Forfeited or expired in 2020, weighted average exercise price	0
Outstanding at December 31, 2020, weighted average exercise price	0	$ 16.71
Exercisable as December 31, 2019, weighted average exercise price	$ 0
Outstanding at December 31, 2020, weighted average remaining contractual life in years	0 years
Exercisable at December 31, 2020, weighted average remaining contractual life in years	0 years
Outstanding at December 31, 2020, aggregate intrinsic value	$ 0
Exerciseable at December 31, 2020, aggregate intrinsic value	0
Total intrinsic value of options exercised	$ 1,300	$ 5,200	$ 4,500

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.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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