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Derivatives Hedges and Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 and 2019:
|  |  |  |  |  | Fair Value Measurements at December 31, 2020 Using |  |  |  |  |
Description |  | Total Fair Value at December 31, 2020 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) (1) |  |  | Total Fair Value at December 31, 2019 |
|  | (In Thousands) |
Assets - Supplies, prepaid items and other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 80 |  |  | $ | — |  |  | $ | 80 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 80 |  |  | $ | — |  |  | $ | 80 |  |  | $ | — |  |  | $ | — |
Liabilities - Current and noncurrent accrued and other liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 1,285 |  |  | $ | — |  |  | $ | 1,285 |  |  | $ | — |  |  | $ | — |
Embedded derivative |  | $ | 1,029 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,029 |  |  | $ | 1,084 |
Total |  | $ | 2,314 |  |  | $ | — |  |  | $ | 1,285 |  |  | $ | 1,029 |  |  | $ | 1,084 |
| (1) | There was no Level 3 transfer activity during 2020, 2019 or 2018.

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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://www.xbrl.org/2003/role/disclosureRef -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://www.xbrl.org/2003/role/disclosureRef -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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