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Equity Incentive Plans (Summary Of Outstanding Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 46.86	$ 46.86	$ 51.64	$ 45.20
Exercise price range, upper limit	$ 65.50	$ 65.50	$ 65.50	$ 65.50
Options outstanding (in shares)	554,469		554,469		950,214
Weighted avg. life remaining (in years)			5 years 7 months
Weighted avg. exercise price	$ 47.90		$ 47.90		$ 42.48
Aggregate intrinsic value	$ 3,557		$ 3,557
$18.18 - 19.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 19.02
Exercise price range, upper limit			$ 19.99
Options outstanding (in shares)	61,097		61,097
Weighted avg. life remaining (in years)			3 years 7 months
20.00 - 29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 20.00
Exercise price range, upper limit			29.99
30.00 - 39.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			30.00
Exercise price range, upper limit			$ 39.99
Options outstanding (in shares)	12,196		12,196
Weighted avg. life remaining (in years)			4 years 5 months
40.00 - 49.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 40.00
Exercise price range, upper limit			$ 49.99
Options outstanding (in shares)	235,593		235,593
Weighted avg. life remaining (in years)			4 years 7 months
50.00 - 59.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 50.00
Exercise price range, upper limit			$ 59.99
Options outstanding (in shares)	111,917		111,917
Weighted avg. life remaining (in years)			7 years 9 months
60.00 - 65.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 60.00
Exercise price range, upper limit			$ 65.50
Options outstanding (in shares)	133,666		133,666
Weighted avg. life remaining (in years)			6 years 8 months
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			5.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			48.00%	50.30%
Minimum [Member] | Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				6.40%

X

- 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.

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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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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 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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