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)