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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | $ 0 | $ (315) | $ 29 | $ (123)
Fair Values of Derivative Instruments | 29 | (185) | 29 | (185)
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | (94) | (245) | (163) | (694)
Fair Values of Derivative Instruments | $ 490 | 383 | $ 490 | 383
Contracts designated as hedging instruments | Other comprehensive income (loss) | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments |  | 10 |  | (87)
Fair Values of Derivative Instruments |  | 106 |  | 106
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments |  | 36 |  | 85
Fair Values of Derivative Instruments |  | $ (58) |  | $ (58)

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