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Derivative Financial Instruments (Schedule Of Derivative Instruments Fair Value And Balance Sheet Classification) (Details) - Forward exchange contracts [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Prepaid And Other Current Assets [Member] |  |
Derivative instruments in asset positions, Forward exchange contracts | $ 40 | $ 1,165
Other Long-Term Assets [Member] |  |
Derivative instruments in asset positions, Forward exchange contracts | 6 | $ 116
Accounts Payable And Accrued Liabilities [Member] |  |
Derivative instruments in liability positions, Forward exchange contracts | 919 |
Other Long-Term Liabilities [Member] |  |
Derivative instruments in liability positions, Forward exchange contracts | $ 74 |

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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=64837297&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=64837297&loc=SL5624163-113959 + Details
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