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Financial Instruments Measured at Fair Value and Concentrations of Credit Risk (Tables) | 3 Months Ended
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Mar. 31, 2021
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Summary of Fair Value Measurements and Financial Statement Presentation | The fair values of our financial instruments measured at fair value and their respective levels in the fair value hierarchy as of March 31, 2021, and December 31, 2020, were as follows:
| March 31, 2021 |  | March 31, 2021 |
| 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 | $ | 3,045 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,045 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Commodity derivative contracts |  | 266 |  |  |  | — |  |  |  | — |  |  |  | 266 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total | $ | 3,311 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,311 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
| 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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Composition of Short-term Investments | The composition of our short-term investments as of March 31, 2021, and December 31, 2020 were as follows:
| As of March 31, |  |  | As of December 31, |
In Thousands | 2021 |  |  | 2020 |
Corporate debt securities | $ | 3,045 |  |  | $ | 11,698 |

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- Definition Tabular disclosure of the components of short-term investments. + References No definition available. + Details
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- Definition Summary of fair value measurements and financial instrument. + References No definition available. + Details
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