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Stock-Based Compensation (Schedule Of Stock Option Plans Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shares |  |  |
Options outstanding, December 31, 2016 | 91,000 |  |
Options exercised (in shares) | (28,000) |  |
Options forfeited and expired (in shares) | 0 |  |
Options outstanding, December 31, 2017 | 63,000 | 91,000 |
Options exercisable at end of year (in shares) | 63,000 |  |
Weighted average exercise price |  |  |
Exercised | $ 66.08 |  |
Options outstanding, December 31, 2017 | 62.86 | $ 63.84 |
Options exercisable at end of year (usd per share) | $ 62.86 |  |
Stock Options Plans |  |  |
Shares |  |  |
Options outstanding, December 31, 2016 | 91,000 | 169,000 | 298,000
Options exercised (in shares) | (28,000) | (78,000) | (66,000)
Options forfeited and expired (in shares) | 0 | 0 | (63,000)
Options outstanding, December 31, 2017 | 63,000 | 91,000 | 169,000
Options exercisable at end of year (in shares) | 63,000 | 90,000 | 164,000
Minimum | Stock Options Plans |  |  |
Weighted average exercise price |  |  |
Exercised | $ 57.34 | $ 28.37 | $ 28.37
Options forfeited and expired during the year (usd per share) | 28.37 | 0.00 | 28.37
Options outstanding, December 31, 2017 | 57.34 | 57.34 | 28.37
Options exercisable at end of year (usd per share) | 57.34 | 57.34 | 28.37
Maximum | Stock Options Plans |  |  |
Weighted average exercise price |  |  |
Exercised | 66.14 | 93.65 | 93.65
Options forfeited and expired during the year (usd per share) | 93.65 | 0.00 | 88.33
Options outstanding, December 31, 2017 | 66.14 | 66.14 | 93.65
Options exercisable at end of year (usd per share) | $ 66.14 | $ 66.14 | $ 93.65

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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 For presentations that combine terminations, 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 or that expired. + 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)-(4) -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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