Equity Incentive Plans (Summary Of Share Option Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 09, 2007
Maximum term of options granted, years	10 years
Exercisable rate for employees options, per year	25.00%
Share based compensation, future vesting period minimum (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Outstanding at Beginning of Period	840,665	881,338	1,002,833
Number of Shares, Exercised	(35,963)	(143,272)	(224,181)
Number of Shares, Granted	172,178	115,257	103,082
Number of Shares, Forfeited	(26,666)	(12,658)	(396)
Number of Shares, Outstanding at End of Period	950,214	840,665	881,338
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Average Exercise Price, Outstanding at Beginning of Period	$ 40.85	$ 38.51	$ 34.41
Average Exercise Price, Exercised	$ 42.63	$ 30.64	$ 23.42
Average Exercise Price, Granted	$ 51.64	$ 47.86	$ 45.60
Average Exercise Price, Forfeited	$ 50.11	$ 56.90	$ 40.03
Average Exercise Price, Outstanding at End of Period	$ 42.48	$ 40.85	$ 38.51
Weighted average fair value of options granted	$ 13.87	$ 12.35	$ 12.08
Intrinsic value of stock options exercised	$ 400,000	$ 2,900,000	$ 5,100,000
option exercise period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Shares	27,250
Share-based Compensation Arrangement by Share-based Payment Award, Repurchase of Treasury Value	1,500,000
Minimum [Member]
Share based compensation, future vesting period minimum (in years)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Option Price Per Share [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	$ 18.18	$ 18.18	$ 18.18
Option Price Per Share, Exercised	$ 32.50	$ 18.18	$ 18.18
Option Price Per Share, Granted	$ 51.64	$ 46.86	$ 44.62
Option Price Per Share, Forfeited	$ 45.20	$ 36.56	$ 18.18
Option Price Per Share, Outstanding at End of Period	$ 18.18	$ 18.18	$ 18.18
Maximum [Member]
Share based compensation, future vesting period minimum (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Option Price Per Share [Roll Forward]
Option Price Per Share, Outstanding at Beginning of Period	$ 65.50	$ 65.50	$ 65.50
Option Price Per Share, Exercised	$ 52.72	$ 47.20	$ 36.56
Option Price Per Share, Granted	$ 51.64	$ 58.09	$ 47.99
Option Price Per Share, Forfeited	$ 51.64	$ 60.42	$ 46.69
Option Price Per Share, Outstanding at End of Period	$ 65.50	$ 65.50	$ 65.50
2007 Equity Incentive Plan [Member]
Common shares, options to purchase common shares and restricted share units, expected to granted				3,650,000
Number of shares available for grant	1,389,685
Stock Options [Member]
Share based compensation, future vesting period minimum (in years)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock or Unit Option Plan Expense	$ 1,400,000	$ 856,000	$ 937,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	2.20%	1.00%	1.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum			1.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	6.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum			51.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum			51.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	50.30%	50.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate	0.28%		0.25%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years		6 years
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		5.40%	6.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate		0.23%
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		6.50%	6.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate		0.29%

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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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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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 estimated measure of the maximum 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 estimated measure of the minimum 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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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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