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Hedging Transactions and Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Notional values of outstanding derivative positions | As of December 31, 2018, the volume of our copper contracts outstanding were as follows:
Volume of Copper Derivatives
January 2019 - March 2019 | 189 metric tons per month
April 2019 - June 2019 | 188 metric tons per month
July 2019 - September 2019 | 191 metric tons per month
October 2019 - December 2019 | 195 metric tons per month
January 2020 - March 2020 | 202 metric tons per month
As of December 31, 2018 the notional values of these foreign currency forward contracts were as follows:
Notional Values of Foreign Currency Derivatives
KRW/USD | ₩ | 1,325,760,000 |
JPY/EUR | ¥ | 675,000,000 |
EUR/USD | € | 10,449,335 |
USD/CNY | $ | 23,655,942 |
Gain (loss) on derivative instruments | Effects on Financial Statements
|  |  |  | The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2018 |  | Fair Values of Derivative Instruments as of December 31, 2018
(Dollars in thousands) |  | Location |  | Gain (Loss) |  | Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (333 | ) |  | $ | 522 |
Copper Derivatives |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (2,101 | ) |  | $ | 583 |
Interest Rate Swap |  |  |  |  |  |
Contract designated as hedging instrument |  | Other comprehensive income (loss) |  | $ | 420 |  |  | $ | 461 |
|  |  |  | The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2017 |  | Fair Values of Derivative Instruments as of December 31, 2017
(Dollars in thousands) |  | Location |  | Gain (Loss) |  | Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (7 | ) |  | $ | (396 | )
Copper Derivatives |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | 1,928 |  |  | $ | 2,016 |
Interest Rate Swap |  |  |  |  |  |
Contract designated as hedging instrument |  | Other comprehensive income (loss) |  | $ | 41 |  |  | $ | 41 |
(1) All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2018 interest rate swap balance, which was recorded in the “Other long-term assets” line item in the consolidated statements of financial position.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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