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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of derivative instruments 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, include:
| Derivative Instruments at Fair Value as of December 31, 2019
(Dollars in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total(1)
Foreign currency contracts | $ | — |  |  | $ | (6 | ) |  | $ | — |  |  | $ | (6 | )
Copper derivative contracts | $ | — |  |  | $ | 1,147 |  |  | $ | — |  |  | $ | 1,147 |
Interest rate swap contract | $ | — |  |  | $ | (1,254 | ) |  | $ | — |  |  | $ | (1,254 | )
| Derivative Instruments at Fair Value as of December 31, 2018
(Dollars in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total(1)
Foreign currency contracts | $ | — |  |  | $ | 522 |  |  | $ | — |  |  | $ | 522 |
Copper derivative contracts | $ | — |  |  | $ | 583 |  |  | $ | — |  |  | $ | 583 |
Interest rate swap contract | $ | — |  |  | $ | 461 |  |  | $ | — |  |  | $ | 461 |
(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 2019 and 2018 interest rate swap balance, which was recorded in the “Other long-term liabilities” and “Other long-term assets” line items, respectively, in the consolidated statements of financial position.

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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=117815213&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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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