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Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 588
Fair Value, Inputs, Level 2 [Member] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 1,332 | 159
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | $ 0 | $ 747

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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