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Stock Incentive Plan (Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives) (Details) - Stock Appreciation Rights (SARs) - $ / shares | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
SSARs Outstanding (in shares) | 1,060,192 | 1,458,611
SSARs Exercisable, Exercisable as of December 31 (in shares) | 348,042 |
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 50.32 |
$43.39 – $52.94 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower limit (in dollars per share) | 43.39 |
Range of Exercise Prices, upper limit (in dollars per share) | $ 52.94 |
SSARs Outstanding (in shares) | 614,600 |
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) | 4 years 1 month 6 days |
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 46.35 |
SSARs Exercisable, Exercisable as of December 31 (in shares) | 248,975 |
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 47.62 |
$55.07 – $70.41 |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Range of Exercise Prices, lower limit (in dollars per share) | 55.07 |
Range of Exercise Prices, upper limit (in dollars per share) | $ 70.41 |
SSARs Outstanding (in shares) | 445,592 |
SSAR Outstanding, Weighted Average Remaining Contractual Life (Years) | 5 years |
SSARs Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 60.94 |
SSARs Exercisable, Exercisable as of December 31 (in shares) | 99,067 |
SSARs Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 57.11 |

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- Definition The number of share-based awards that were exercisable as of the reporting date, excluding options. + References No definition available. + Details
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- Definition The weighted average exercise price of share-based awards that were exercisable as of the reporting date, excluding options. + References No definition available. + Details
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- Definition Weighted average exercise price for equity-based awards excluding options. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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 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)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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