Stock Compensation Plans and Other Employee Benefit Plans (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Shares
Common shares, outstanding at beginning of the period (in shares)	193,447	520,663	755,332
Common shares, exercised (in shares)	(123,924)	(326,626)	(229,061)
Common shares, forfeited or canceled (in shares)	(1,430)	(590)	(5,608)
Common shares, outstanding at end of the period (in shares)	68,093	193,447	520,663
Common shares, exercisable (in shares)	68,093	191,898	512,762
Common shares, vested or expected to vest (in shares)	68,093
Weighted Average Strike Price
Weighted average strike price, outstanding at beginning of period (usd per share)	$ 41.62	$ 42.47	$ 42.43
Weighted average strike price, exercised (usd per share)	41.89	42.97	42.29
Weighted average strike price, forfeited or canceled (usd per share)	40.87	46.86	44.34
Weighted average strike price, outstanding at end of period (usd per share)	41.14	41.62	42.47
Weighted average strike price, exercisable (in dollars per share)	41.14	$ 41.57	$ 42.46
Weighted average strike price, vested or expected to vest (in dollars per share)	$ 41.14
Stock Options Additional Disclosures
Remaining contractual term, outstanding	1 year 1 month 6 days	1 year 4 months 24 days	1 year 10 months 24 days
Remaining contractual term, exercisable	1 year 1 month 6 days	1 year 3 months 18 days	1 year 9 months 18 days
Remaining contractual term, vested or expected to vest	1 year 1 month 6 days
Intrinsic value, outstanding	$ 2,954	$ 9,518	$ 9,694
Intrinsic value, exercisable	2,954	$ 9,451	$ 9,555
Intrinsic value, vested or expected to vest	$ 2,954

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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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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