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Equity Incentive Plans (Summary Of Exercisable Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Exercise price range, lower limit | $ 61.79 | $ 61.79 |
Exercise price range, upper limit | $ 76.63 | $ 76.63 | $ 61.79
Options outstanding | 208,841 |  |
Weighted avg. life remaining | 4 years 5 months |  |
Weighted avg. exercise price | $ 50.73 |  |
Aggregate intrinsic value | $ 2,784 |  |
$ 19.02 - 19.99 [Member] |  |  |
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 | 68,033 |  |
Weighted avg. life remaining | 5 years |  |
60.00 - 69.99 [Member] |  |  |
Exercise price range, lower limit | $ 60.00 |  |
Exercise price range, upper limit | $ 61.79 |  |
Options outstanding | 55,387 |  |
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 | 554 |  |
Weighted avg. life remaining | 8 years 1 month |  |

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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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -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 The ceiling 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 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. + 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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