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Hedging Transactions and Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Notional values of outstanding derivative positions | As of December 31, 2017, the volume of our copper contracts outstanding were:
Volume of Copper Derivatives
January 2018 - March 2018 | 140 metric tons per month
April 2018 - June 2018 | 153 metric tons per month
July 2018 - September 2018 | 153 metric tons per month
October 2018 - December 2018 | 119 metric tons per month
As of December 31, 2017 the notional values of these foreign currency forward contracts were:
Notional Values of Foreign Currency Derivatives
KRW/USD | ₩ | 4,503,980,000 |
EUR/CNY | € | 1,049,585 |
JPY/EUR | ¥ | 325,000,000 |
EUR/USD | € | 7,068,140 |
EUR/HUF | € | 563,119 |
USD/CNY | $ | 12,828,710 |
Gain (loss) on derivative instruments | Effects on Statements of Operations and Statements of Comprehensive Income (Loss):
(Dollars in thousands) |  |  |  | The Effect of Derivative Instruments on the Financial Statements for the year ended December 31, 2017 |  | Fair Values of Derivative Instruments as of December 31, 2017
Foreign Exchange Contracts |  | Location |  | Gain/(Loss) |  | Other Assets (Liabilities)
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (7 | ) |  | $ | (396 | )
Copper Derivative Instruments |  |  |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | 1,928 |  |  | $ | 2,016 |
Interest Rate Swap Instrument |  |  |  |  |  |
Contracts designated as hedging instruments |  | Other comprehensive income (loss) |  | $ | 41 |  |  | $ | 41 |
(Dollars in thousands) |  |  |  | The Effect of Derivative Instruments on the Financial Statements for the year ended December 31, 2016 |  | Fair Values of Derivative Instruments as of December 31, 2016
Foreign Exchange Contracts |  | Location |  | Gain/(Loss) |  | Other Assets (Liabilities)
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | (170 | ) |  | $ | (170 | )
Copper Derivative Instruments |  |  |  |  |  |  |  |
Contracts not designated as hedging instruments |  | Other income (expense), net |  | $ | 625 |  |  | $ | 1,277 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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