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Equity Incentive Plans (Summary Of Outstanding Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Exercise price range, lower limit | $ 61.79 | $ 61.79 |  |
Exercise price range, upper limit | $ 76.63 | $ 76.63 | $ 61.79 |
Options outstanding | 234,875 | 257,606 | 285,986 | 516,305
Weighted avg. life remaining | 4 years 7 months |  |  |
Weighted avg. exercise price | $ 51.98 | $ 51.81 | $ 51.93 | $ 48.42
Aggregate intrinsic value | $ 2,857 |  |  |
$ 19.02 - 19.99 |  |  |  |
Exercise price range, lower limit | $ 19.02 |  |  |
Exercise price range, upper limit | $ 19.99 |  |  |
Options outstanding | 11,097 |  |  |
Weighted avg. life remaining | 5 months |  |  |
20.00 - 29.99 [Member] |  |  |  |
Exercise price range, lower limit | $ 20.00 |  |  |
Exercise price range, upper limit | $ 29.99 |  |  |
Options outstanding | 0 |  |  |
30.00 - 39.99 [Member] |  |  |  |
Exercise price range, lower limit | $ 30.00 |  |  |
Exercise price range, upper limit | $ 39.99 |  |  |
Options outstanding | 1,428 |  |  |
Weighted avg. life remaining | 1 year |  |  |
40.00 - 49.99 [Member] |  |  |  |
Exercise price range, lower limit | $ 40.00 |  |  |
Exercise price range, upper limit | $ 49.99 |  |  |
Options outstanding | 72,342 |  |  |
Weighted avg. life remaining | 3 years 1 month |  |  |
50.00 - 59.99 [Member] |  |  |  |
Exercise price range, lower limit | $ 50.00 |  |  |
Exercise price range, upper limit | $ 59.99 |  |  |
Options outstanding | 71,868 |  |  |
Weighted avg. life remaining | 5 years 2 months |  |  |
60.00 - 69.99 [Member] |  |  |  |
Exercise price range, lower limit | $ 60.00 |  |  |
Exercise price range, upper limit | $ 61.79 |  |  |
Options outstanding | 75,925 |  |  |
Weighted avg. life remaining | 6 years 1 month |  |  |
70.00 - 76.63 [Member] |  |  |  |
Exercise price range, lower limit | $ 70.00 |  |  |
Exercise price range, upper limit | $ 76.63 |  |  |
Options outstanding | 2,215 |  |  |
Weighted avg. life remaining | 8 years 1 month |  |  |

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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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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