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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation | Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:
(Dollars in thousands) | Carrying amount as of December 31, 2015 |  | Level 1 |  | Level 2 |  | Level 3
Foreign currency contracts | $ | (78 | ) |  | $ | — |  |  | $ | (78 | ) |  | $ | — |
Copper derivative contracts | $ | 193 |  |  | $ | — |  |  | $ | 193 |  |  | $ | — |
Interest rate swap | $ | (18 | ) |  | $ | — |  |  | $ | (18 | ) |  | $ | — |
(Dollars in thousands) | Carrying amount as of December 31, 2014 |  | Level 1 |  | Level 2 |  | Level 3
Foreign currency contracts | $ | (18 | ) |  | $ | — |  |  | $ | (18 | ) |  | $ | — |
Copper derivative contracts | $ | 355 |  |  | $ | — |  |  | $ | 355 |  |  | $ | — |
Interest rate swap | $ | (144 | ) |  | $ | — |  |  | $ | (144 | ) |  | $ | — |
Assets measured at fair value on a nonrecurring basis | The following table presents information about our assets and liabilities measured at fair value on a non-recurring basis as of December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall. This Level 3 asset represents the investment in BrightVolt, Inc. (formerly known as Solicore, Inc.) The valuation is based on our evaluation of BrightVolt's financial performance through December 31, 2015 and the most recent round of capital financing that was initiated in the first quarter of 2015. See Note 9, "Investment" for further details.
(Dollars in thousands) | Carrying amount as of December 31, 2015 |  | Level 1 |  | Level 2 |  | Level 3
BrightVolt investment | $ | 341 |  |  | $ | — |  |  | $ | — |  |  | $ | 341 |
There were no changes in the fair value of the BrightVolt investment Level 3 asset for the year ended December 31, 2015.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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