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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | $ 943 | $ (125) | $ 908 | $ (398)
Fair Values of Derivative Instruments | 908 | (39) | 908 | (39)
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | (79) | (157) | (103) | (449)
Fair Values of Derivative Instruments | 315 | 436 | 315 | 436
Contracts designated as hedging instruments | Other comprehensive income (loss) | Foreign Exchange Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments |  | (335) |  | (100)
Fair Values of Derivative Instruments |  | 274 |  | 274
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Effect of current derivative instruments | 0 | 35 | 0 | 51
Fair Values of Derivative Instruments | $ 0 | $ (93) | $ 0 | $ (93)

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