Hedging Transactions and Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional values of outstanding derivative positions

Notional Value of Copper Derivatives
January 2016- March 2016	150 metric tons per month
April 2016 - June 2016	130 metric tons per month
July 2016 - September 2016	127 metric tons per month
October 2016 - December 2016	117 metric tons per month
January 2017 - March 2017	16 metric tons per month

Notional Values of Foreign Currency Derivatives
YEN/USD	¥	155,000,000
USD/KRW	₩	7,580,028,000
CNY/EUR	¥	14,000,000
EUR/GBP	€	408,291
CNY/USD	¥	45,000,000
USD/EUR	$	400,000
YEN/EUR	¥	160,000,000
EUR/CNH	€	363,029

Gain (loss) on derivative instruments

(Dollars in thousands)	The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2015				Fair Values of Derivative Instruments as of December 31, 2015
Foreign Exchange Contracts	Location of gain (loss)	Amount of gain (loss)			Other Assets (Liabilities)
Contracts not designated as hedging instruments	Other income (expense), net	$	(78	)	$	(78	)
Copper Derivative Instruments
Contracts not designated as hedging instruments	Other income (expense), net	(666		)	193
Interest Rate Swap Instrument
Contracts designated as hedging instruments	Other comprehensive income (loss)	126			(18		)

(Dollars in thousands)	The Effect of Current Derivative Instruments on the Financial Statements for the year ended December 31, 2014				Fair Values of Derivative Instruments as of December 31, 2014
Foreign Exchange Contracts	Location of gain (loss)	Amount of gain (loss)			Other Assets (Liabilities)
Contracts not designated as hedging instruments	Other income (expense), net	$	(18	)	$	(18	)
Copper Derivative Instruments
Contracts not designated as hedging instruments	Other income (expense), net	(605		)	355
Interest Rate Swap Instrument
Contracts designated as hedging instruments	Other comprehensive income (loss)	152			(144		)