Hedging Transactions and Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

The notional values of our copper contracts outstanding as of March 31, 2018 were:

Volume of Copper Derivatives
April 2018 - June 2018	153 metric tons per month
July 2018 - September 2018	153 metric tons per month
October 2018 - December 2018	153 metric tons per month
January 2019 - March 2019	162 metric tons per month
April 2019 - June 2019	56 metric tons per month

As of March 31, 2018 the notional values of these foreign currency forward contracts were:

Notional Values of Foreign Currency Derivatives
KRW/USD	₩	2,477,560,000
JPY/EUR	¥	310,000,000
EUR/USD	€	8,081,989
EUR/HUF	€	608,174
USD/CNY	$	10,637,837

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

Effects on Statements of Operations and of Comprehensive Income (Loss):

(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the period ended March 31, 2018			Fair Values of Derivative Instruments as of March 31, 2018
		Gain (Loss)			Other Assets (Liabilities)
Foreign Exchange Contracts	Location	Quarter Ended
Contracts not designated as hedging instruments	Other income (expense), net	$	(64	)	$	(329	)
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	(822	)	$	1,105
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	989		$	1,030

(Dollars in thousands)		The Effect of Current Derivative Instruments on the Financial Statements for the period ended March 31, 2017			Fair Values of Derivative Instruments as of March 31, 2017
		Gain (Loss)			Other Assets (Liabilities)
Foreign Exchange Contracts	Location	Quarter Ended
Contracts not designated as hedging instruments	Other income (expense), net	$	21		$	21
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	215		$	1,342
Interest Rate Swap
Contracts designated as hedging instruments	Other comprehensive income (loss)	$	(180	)	$	(180	)