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Hedging Transactions and Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2018 were:
Volume of Copper Derivatives
October 2018 - December 2018 | 153 metric tons per month
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 | 144 metric tons per month
As of September 30, 2018 the notional values of these foreign currency forward contracts were:
Notional Values of Foreign Currency Derivatives
KRW/USD |  | ₩ | 2,650,560,000 |
JPY/EUR |  | ¥ | 465,000,000 |
EUR/USD |  | € | 12,413,251 |
EUR/HUF |  | € | 1,582,984 |
USD/CNY |  | $ | 10,637,837 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance | Effects on Financial Statements:
(Dollars in thousands) |  |  |  | The Effect of Current Derivative Instruments on the Financial Statements for the period ended September 30, 2018 |  | Fair Values of Derivative Instruments as of September 30, 2018
|  |  |  | Gain (Loss) |  | Other Current Assets/ (Other Accrued Liabilities)
Foreign Exchange Contracts |  | Location |  | Three Months Ended |  | Nine Months Ended |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | 29 |  |  | $ | (95 | ) |  | $ | 342 |
Copper Derivatives |  |  |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (453 | ) |  | $ | (1,637 | ) |  | $ | 631 |
Interest Rate Swap |  |  |  |  |  |  |  |
Contracts designated as hedging instruments |  | Other comprehensive income (loss) |  | $ | 270 |  |  | $ | 1,669 |  |  | $ | 1,710 |
(Dollars in thousands) |  |  |  | The Effect of Current Derivative Instruments on the Financial Statements for the period ended September 30, 2017 |  | Fair Values of Derivative Instruments as of September 30, 2017
|  |  |  | Gain (Loss) |  | Other Current Assets/ (Other Accrued Liabilities)
Foreign Exchange Contracts |  | Location |  | Three Months Ended |  | Nine Months Ended |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | (198 | ) |  | (382 | ) |  | (382 | )
Copper Derivatives |  |  |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | 474 |  |  | 578 |  |  | 1,534 |
Interest Rate Swap |  |  |  |  |  |  |  |
Contracts designated as hedging instruments |  | Other comprehensive income (loss) |  | 100 |  |  | (415 | ) |  | (638 | )

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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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