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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Assets Measured at Fair Value on a Recurring Basis, Categorized by the Level of Inputs Used in the Valuation | Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, consist of:
| Derivative Instruments at Fair Value as of September 30, 2018
(Dollars in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Foreign currency contracts | $ | — |  |  | $ | 342 |  |  | $ | — |  |  | $ | 342 |
Copper derivative contracts | $ | — |  |  | $ | 631 |  |  | $ | — |  |  | $ | 631 |
Interest rate swap | $ | — |  |  | $ | 1,710 |  |  | $ | — |  |  | $ | 1,710 |
| Derivative Instruments at Fair Value as of December 31, 2017
(Dollars in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Foreign currency contracts | $ | — |  |  | $ | (396 | ) |  | $ | — |  |  | $ | (396 | )
Copper derivative contracts | $ | — |  |  | $ | 2,016 |  |  | $ | — |  |  | $ | 2,016 |
Interest rate swap | $ | — |  |  | $ | 41 |  |  | $ | — |  |  | $ | 41 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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