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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The balance in our accumulated other comprehensive income (loss) is set forth in the following table:
| As of December 31, 2018 |  | As of December 31, 2017
| (Dollars in thousands)
Foreign currency translation adjustments, net of tax | $ | (2,922 | ) |  | $ | 15,468 |
Commodities and foreign currency derivatives, net of tax | (2,878 | ) |  | 4,821 |
Total accumulated comprehensive (loss) income | $ | (5,800 | ) |  | $ | 20,289 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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