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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Summary Of Share Incentive Plans) (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, Number At December 31, 2017 | shares	68,978
Granted, Options Outstanding | shares	9,994
Exercised/Vested, Options Outstanding | shares	(26,114)
Forfeited, Options Outstanding | shares	0
Outstanding Options, Number At June 30, 2018 | shares	52,858
Options outstanding at December 31, 2017, Weighted Average Exercise/Grant Price | $ / shares	$ 61.15
Granted, Weighted Average Exercise/Grant Price | $ / shares	78.55
Exercised/Vested, Weighted Average Exercise/Grant Price | $ / shares	30.06
Forfeited, Weighted Average Exercise/Grant Price | $ / shares	0.00
Options outstanding at June 30, 2018, Weighted Average Exercise/Grant Price | $ / shares	$ 79.79	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested share awards outstanding at December 31, 2017, Share Awards Outstanding | shares	499,898
Granted, Share Awards Outstanding | shares	230,353
Exercised/Vested, Share Awards Outstanding | shares	(315,789)
Forfeited, Share Awards Outstanding | shares	(13,478)
Nonvested share awards outstanding at June 30, 2018, Share Awards Outstanding | shares	400,984
Nonvested share awards outstanding at December 31, 2017, Weighted Average Exercise/Grant Price | $ / shares	$ 75.80
Granted, Weighted Average Exercise/Grant Price | $ / shares	82.73
Exercised/Vested, Weighted Average Exercise/Grant Price | $ / shares	75.65
Forfeited, Weighted Average Exercise/Grant Price | $ / shares	79.26
Nonvested share awards outstanding at June 30, 2018, Weighted Average Exercise/Grant Price | $ / shares	$ 79.77
[1] The aggregate intrinsic value of options outstanding and exercisable at June 30, 2018 was $0.6 million. The aggregate intrinsic value was calculated as the excess, if any, between our closing share price of $91.13 per share on June 30, 2018 and the strike price of the underlying award.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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

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

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

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