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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | $ 30,500,000 | $ 30,900,000
Derivatives, net | (8,900,000) | 6,800,000
Total Financial Liabilities | (8,900,000) |
Total Financial Assets | 30,500,000 | 37,700,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | 30,500,000 | 30,900,000
Derivatives, net | 0 | 0
Total Financial Liabilities | 0 |
Total Financial Assets | 30,500,000 | 30,900,000
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | 0 | 0
Derivatives, net | (8,900,000) | 6,800,000
Total Financial Liabilities | (8,900,000) |
Total Financial Assets | 0 | 6,800,000
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Supplemental executive retirement plan assets | 0 | 0
Derivatives, net | 0 | 0
Total Financial Liabilities | 0.0 |
Total Financial Assets | $ 0.0 | $ 0

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- Definition Total Financial Assets + References No definition available. + Details
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- Definition Total Financial Liabilities + References No definition available. + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + 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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