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Equity Incentive Plans (Summary Of Outstanding Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ 76.63 |  | $ 76.63 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ 61.79 | $ 61.79 | $ 61.79 | $ 61.79 |
Options outstanding (in shares) | 258,684 |  | 258,684 |  | 285,986
Weighted avg. life remaining (in years) |  |  | 6 years |  |
Weighted avg. exercise price | $ 51.80 |  | $ 51.80 |  | $ 51.93
Aggregate intrinsic value | $ 5,202 |  | $ 5,202 |  |
Share Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  | 22.00% |  |
Minimum [Member] | Share Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  | 5.40% |  |
Exercise Price Range Nineteen Point Two to Nineteen Point Nine Nine [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 19.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 19.02 |  |
Options outstanding (in shares) | 11,097 |  | 11,097 |  |
Weighted avg. life remaining (in years) |  |  | 1 year 11 months |  |
Twenty To Twenty Nine Point Nine Nine Member |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 29.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | 20.00 |  |
Thirty To Thirty Nine Point Nine Nine Member |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | 39.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 30.00 |  |
Options outstanding (in shares) | 1,428 |  | 1,428 |  |
Weighted avg. life remaining (in years) |  |  | 2 years 6 months |  |
Forty To Forty Nine Point Nine Nine Member |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 49.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 40.00 |  |
Options outstanding (in shares) | 86,913 |  | 86,913 |  |
Weighted avg. life remaining (in years) |  |  | 4 years 7 months |  |
Fifty To Fifty Nine Point Nine Nine Member |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 59.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 50.00 |  |
Options outstanding (in shares) | 75,995 |  | 75,995 |  |
Weighted avg. life remaining (in years) |  |  | 6 years 3 months |  |
Sixty To Sixty Five Point Five Zero Member |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 69.99 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 60.00 |  |
Options outstanding (in shares) | 81,036 |  | 81,036 |  |
Weighted avg. life remaining (in years) |  |  | 7 years 7 months |  |
Seventy To Seventy Six Point Six Three [Member] |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 76.63 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 70.00 |  |
Options outstanding (in shares) | 2,215 |  | 2,215 |  |
Weighted avg. life remaining (in years) |  |  | 9 years 8 months |  |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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