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Financial Instruments, Fair Value, and Concentrations of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2020
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Summary of Fair Value Measurements and Financial Statement Presentation | The fair values of our assets, liabilities, and derivative positions recorded at fair value and their respective levels in the fair value hierarchy as of December 31, 2020 and December 31, 2019, were as follows:
|  | December 31, 2020 |  |  | December 31, 2020 |
|  | Fair Values of Assets |  |  | Fair Values of Liabilities |
In Thousands |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Other items reported at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  | $ | 11,698 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,698 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commodity derivative contracts |  |  | 467 |  |  |  | — |  |  |  | — |  |  |  | 467 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 12,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,165 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | December 31, 2019 |  |  | December 31, 2019 |
|  | Fair Values of Assets |  |  | Fair Values of Liabilities |
In Thousands |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Other items reported at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Composition of Short-term Investments | The composition of our short-term investments as of December 31, 2020, and December 31, 2019 were as follows:
| As of December 31, |
In Thousands | 2020 |  |  | 2019 |
Corporate debt securities | $ | 11,698 |  |  | $ | — |
Summary of Certain Amounts Related to Hedging Activities | Certain amounts related to our hedging activities are as follows:
|  | Amount of Gain (Loss) |  | Amount of Gain (Loss) Reclassified to Earnings |
|  | Recognized in AOCI |  | Year ended |
|  | December 31, |  | December 31, |
In thousands |  | 2020 |  |  | 2019 |  |  |  | 2020 |  |  | 2019 |  |  | 2018 |
Cash flow hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | — |  |  | $ | 17 |  |  |  | $ | 17 |  |  | $ | (81 | ) |  | $ | — |
Total |  | $ | — |  |  | $ | 17 |  |  |  | $ | 17 |  |  | $ | (81 | ) |  | $ | — |

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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=121590274&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=121590274&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=121590274&loc=SL5624171-113959 + Details
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