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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | $ (312) | $ 943 | $ (291) | $ 908
Fair Values of Derivative Instruments | (312) | 908 | (312) | 908
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | 71 | (79) | 205 | (103)
Fair Values of Derivative Instruments | 1,331 | $ 315 | 1,331 | $ 315
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest rate swap |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | (335) |  | (515) |
Fair Values of Derivative Instruments | $ (622) |  | $ (622) |

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