Fair value of the assets less the liabilities of a derivative or group of derivatives.

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=118260190&loc=d3e13433-108611

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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

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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.

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Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Contracts not designated as hedging instruments \| Other income (expense), net \| Foreign Currency Contracts
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	$ 125	$ (60)	$ (586)	$ (124)
Contracts not designated as hedging instruments \| Other income (expense), net \| Copper Derivative Contracts
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	(775)	(363)	(465)	(1,185)
Contract designated as hedging instrument \| Other comprehensive income (loss) \| Interest rate swap
Derivative [Line Items]
The Effect of Current Derivative Instruments on the Financial Statements, Gain (Loss)	(1,113)	410	(1,745)	1,399
Level 2 \| Fair Value, Measurements, Recurring \| Foreign Currency Contracts
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	(184)	118	(184)	118
Level 2 \| Fair Value, Measurements, Recurring \| Copper Derivative Contracts
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	762	827	762	827
Level 2 \| Fair Value, Measurements, Recurring \| Interest rate swap
Derivative [Line Items]
Fair Value of Derivative Instruments, Other Assets/(Other Liabilities)	$ (1,284)	$ 1,439	$ (1,284)	$ 1,439