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Share-Based Compensation (Schedule Of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Options outstanding, January 1 | 541,679 | 741,676 | 871,671
Options outstanding, December 31 | 859,182 | 541,679 | 741,676
Options exercisable, December 31 | 465,831 |  |
Weighted Average Exercise Price, Options outstanding, January 1 | $ 65.84 | $ 60.43 | $ 60.43
Weighted Average Exercise Price, Options outstanding, December 31 | 70.11 | $ 65.84 | $ 60.43
Weighted Average Exercise Price, Options exercisable, December 31 | $ 69.85 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 3 years 4 months 22 days |  |
Weighted Average Remaining Contractual Life (Years), Options exercisable, December 31 | 3 years 4 days |  |
Aggregate Intrinsic Value, Options outstanding, December 31 | $ 4,531 |  |
Aggregate Intrinsic Value, Options exercisable, December 31 | $ 2,578 |  |
2005 Plan [Member] |  |  |
Options granted |  |  | 20,000
Options exercised | (15,000) | (61,666) | (66,670)
Weighted Average Exercise Price, Options granted |  |  | $ 72.11
Weighted Average Exercise Price, Options exercised | $ 47.52 | $ 52.36 | $ 46.87
2012 Plan [Member] |  |  |
Options granted | 495,000 | 470,000 | 450,000
Options exercised | (155,829) | (608,331) | (421,657)
Options forfeited | (6,668) |  | (111,668)
Weighted Average Exercise Price, Options granted | $ 74.90 | $ 60.78 | $ 72.11
Weighted Average Exercise Price, Options exercised | 65.73 | $ 65.18 | 63.03
Weighted Average Exercise Price, Options forfeited | $ 60.52 |  | $ 71.95
Grant Date 2-25-2013 |  |  |
Options outstanding, December 31 | 15,000 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 64.49 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 1 month 26 days |  |
Grant Date 2-25-2014 |  |  |
Options outstanding, December 31 | 48,334 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 61.31 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 1 year 1 month 26 days |  |
Grant Date 2-20-2015 |  |  |
Options outstanding, December 31 | 120,004 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 72.11 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 2 years 1 month 21 days |  |
Grant Date 2-22-2016 |  |  |
Options outstanding, December 31 | 185,842 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 60.52 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 3 years 1 month 24 days |  |
Grant Date 3-8-2016 |  |  |
Options outstanding, December 31 | 26,667 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 63.63 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 3 years 2 months 8 days |  |
Grant Date 2-22-2017 |  |  |
Options outstanding, December 31 | 453,335 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 74.78 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 4 years 1 month 24 days |  |
Grant Date 9-1-2017 |  |  |
Options outstanding, December 31 | 10,000 |  |
Weighted Average Exercise Price, Options outstanding, December 31 | $ 80.55 |  |
Weighted Average Remaining Contractual Life (Years), Options outstanding, December 31 | 4 years 8 months 5 days |  |

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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 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. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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=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 could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + 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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- 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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