Maximum Term of Options Granted

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Range of settlement date for shares for non-employee trustee from grant date, minimum

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable Rate

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Price Per Share

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-employee Trustee Length of Period Subsequent to Grant Date Options Not Exercisable

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Price Per Share

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Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value

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stock option expense including severance costs

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- 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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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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- Definition

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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

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- Definition

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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No definition available.

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- Definition

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

+ References

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- Definition

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

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No definition available.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Expected term of share-based compensation awards, 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 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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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No definition available.

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

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Equity Incentive Plans (Summary Of Share Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	May 12, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit		$ 46.86		$ 51.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-employee Trustee Length of Period Subsequent to Grant Date Options Not Exercisable			1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			5 years 8 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			4 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	255,872		255,872
Range of settlement date for shares for non-employee trustee from grant date, minimum			1 year
Maximum term of options granted (in years)			10 years
Exercisable rate for employees options, per year			25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at Beginning of Period			516,305
Number of Shares, Exercised			(128,027)
Number of Shares, Granted			0
Number of Shares, Outstanding at End of Period	388,278		388,278
Average Exercise Price, Outstanding at Beginning of Period	$ 51.81		$ 51.81			$ 48.42
Average Exercise Price, Exercised			38.13
Average Exercise Price, Outstanding at End of Period	$ 51.81		$ 51.81			48.42
Weighted average fair value of options granted				$ 16.35
Intrinsic value of stock options exercised			$ 3,400	$ 6,700
Repurchase of treasury stock (in shares)			86,337
Repurchase of treasury stock, value			$ 5,600
Share based compensation expenses recognized in future periods			1,200
Retirement severance expense	$ 0	$ 0	$ 0	18,578
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	$ 19.02		$ 19.02			19.02
Option Price Per Share, Exercised			19.41
Option Price Per Share, Outstanding at End of Period	19.02		19.02			19.02
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	65.50		65.50			65.50
Option Price Per Share, Exercised			65.50
Option Price Per Share, Outstanding at End of Period	$ 65.50		$ 65.50			$ 65.50
Restricted Stock Units (RSUs) [Member]
Range of settlement date for shares for non-employee trustee from grant date, minimum			1 year
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock-option expense			$ 684	830
stock option expense including severance costs				$ 2,200
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum				1.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				48.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate				0.78%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term				6 years
Share Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				5.90%
2016 Equity Incentive Plan [Member]
Common shares, options to purchase common shares and restricted share units, expected to granted (in shares)					1,950,000
Number of shares available for grant (in shares)	1,950,000		1,950,000
Chief Executive Officer [Member] \| Accelerated Vesting of Shares [Member] \| Employee Severance [Member] \| Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Retirement severance expense				$ 1,400
Exercise Price Range Nineteen Point Two to Nineteen Point Nine Nine [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 19.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			2 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			2 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	11,097		11,097
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	11,097		11,097
Thirty To Thirty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 30.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			3 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			3 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,428		1,428
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	1,428		1,428
Forty To Forty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 40.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			4 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			4 years 4 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	145,971		145,971
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	160,251		160,251
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 50.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			6 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			6 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	48,679		48,679
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	100,820		100,820
Sixty To Sixty Five Point Five Zero Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 60.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			6 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term			3 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	48,697		48,697
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at End of Period	114,682		114,682