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Hedging Transactions and Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of notional values of outstanding derivative positions and volume of copper contracts outstanding
As of December 31, 2019, the volume of our copper contracts outstanding were as follows:
Volume of Copper Derivatives
January 2020 - March 2020
202 metric tons per month
April 2020 - June 2020
202 metric tons per month
July 2020 - September 2020
201 metric tons per month
October 2020 - December 2020
201 metric tons per month
January 2021 - March 2021
256 metric tons per month

As of December 31, 2019 the notional values of these foreign currency forward contracts were as follows:
Notional Values of Foreign Currency Derivatives
KRW/USD
₩
10,413,450,000

USD/CNY
$
17,131,000

EUR/USD
€
13,408,000

JPY/EUR
¥
125,000,000
Schedule of gain (loss) on derivative instruments
Effects on Financial Statements
The following table presents the impact from these instruments on the statement of operations and statements of comprehensive income:
 
 
Years Ended December 31,
(Dollars in thousands)
Financial Statement Line Item
2019
 
2018
 
2017
Foreign Currency Contracts
 
 
 
 
 
 
Contracts not designated as hedging instruments
Other income (expense), net
$
(779
)
 
$
(333
)
 
$
(7
)
Copper Derivatives Contracts
 
 
 
 
 
 
Contracts not designated as hedging instruments
Other income (expense), net
$
(716
)
 
$
(2,101
)
 
$
1,928

Interest Rate Swap Contract
 
 
 
 
 
 
Contract designated as hedging instrument
Other comprehensive income (loss)
$
(1,715
)
 
$
420

 
$
41