Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Contracts not designated as hedging instruments | Other income (expense), net | Foreign Exchange Contracts
Derivative [Line Items]
Effect of current derivative instruments	$ 0	$ (114)
Fair Values of Derivative Instruments	21	(114)
Contracts not designated as hedging instruments | Other income (expense), net | Copper Derivatives
Derivative [Line Items]
Effect of current derivative instruments	215	33
Fair Values of Derivative Instruments	1,342	255
Contracts designated as hedging instruments | Other comprehensive income (loss) | Interest Rate Swap
Derivative [Line Items]
Effect of current derivative instruments	(180)	11
Fair Values of Derivative Instruments	$ (180)	$ (7)