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Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | $ 29 | $ (198) | $ (95) | $ (382)
Fair Values of Derivative Instruments | 342 | (382) | 342 | (382)
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | (453) | 474 | (1,637) | 578
Fair Values of Derivative Instruments | 631 | 1,534 | 631 | 1,534
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest rate swap |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | 270 | 100 | 1,669 | (415)
Fair Values of Derivative Instruments | $ 1,710 | $ (638) | $ 1,710 | $ (638)

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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