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Derivatives Hedges and Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Assets and Liabilities Measured at Fair Value on Recurring Basis | The following details our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2018 and 2017:
|  |  |  |  |  | Fair Value Measurements at December 31, 2018 Using |  |  |  |  |
Description |  | Total Fair Value at December 31, 2018 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total Fair Value at December 31, 2017 |
|  | (In Thousands) |
Assets - Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | $ | 533 |  |  | $ | — |  |  | $ | — |  |  | $ | 533 |  |  | $ | — |
Total |  | $ | 533 |  |  | $ | — |  |  | $ | — |  |  | $ | 533 |  |  | $ | — |
Liabilities - Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivative |  | $ | (1,642 | ) |  | $ | — |  |  | $ | — |  |  | $ | (1,642 | ) |  | $ | (2,660 | )
Other |  |  | (533 | ) |  |  | — |  |  |  | — |  |  |  | (533 | ) |  |  | — |
Total |  | $ | (2,175 | ) |  | $ | — |  |  | $ | — |  |  | $ | (2,175 | ) |  | $ | (2,660 | )
Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis | The following is a reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
|  | Assets |  |  | Liabilities |
|  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (In Thousands) |
Beginning balance |  | $ | — |  |  | $ | — |  |  | $ | 1,154 |  |  | $ | (2,660 | ) |  | $ | (2,557 | ) |  | $ | (1,154 | )
Transfers into Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,817 | )
Transfers out of Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total realized and unrealized gains (losses) included in operating results |  |  | 2,214 |  |  |  | 2,031 |  |  |  | 1,256 |  |  |  | (606 | ) |  |  | (1,690 | ) |  |  | 802 |
Purchases |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Issuances |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (229 | ) |  |  | — |  |  |  | — |
Sales |  |  | (1,681 | ) |  |  | (2,031 | ) |  |  | (2,410 | ) |  |  | — |  |  |  | — |  |  |  | — |
Settlements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,320 |  |  |  | 1,587 |  |  |  | 3,612 |
Ending balance |  | $ | 533 |  |  | $ | — |  |  | $ | — |  |  | $ | (2,175 | ) |  | $ | (2,660 | ) |  | $ | (2,557 | )
Total gains (losses) for the period included in operating results attributed to the change in unrealized gains or losses on assets and liabilities still held at the reporting date |  | $ | 533 |  |  | $ | — |  |  | $ | — |  |  | $ | (1,780 | ) |  | $ | (103 | ) |  | $ | (983 | )
Net Gains (Losses) Included in Operating Results and Statement of Operations Classifications | Net gains (losses) included in operating results and the statement of operations classifications are as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (In Thousands) |
Total net gains (losses) included in operating results: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales - Undesignated commodities contracts |  | $ | — |  |  | $ | — |  |  | $ | 140 |
Cost of sales - Undesignated foreign exchange contracts |  |  | — |  |  |  | — |  |  |  | 5 |
Other income, net - Other |  |  | 361 |  |  |  | 444 |  |  |  | 532 |
Non-operating other income (expense) - embedded derivative |  |  | 1,247 |  |  |  | (103 | ) |  |  | (983 | )
Total net gains (losses) included in operating results |  | $ | 1,608 |  |  | $ | 341 |  |  | $ | (306 | )

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- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs). + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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