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Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables summarize significant assets and liabilities measured at fair value in the condensed consolidated balance sheets on a recurring basis for each of the fair value levels (in thousands):
| Fair Value Measurement at Reporting Date Using
September 30, 2024 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 56,314 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,314 |
Total assets | $ | 56,314 |  |  | $ | — |  |  | $ | — |  |  | $ | 56,314 |
Accrued and other current liabilities: |  |  |  |  |  |  |
Crude oil swaps | $ | — |  |  | $ | 363 |  |  | $ | — |  |  | $ | 363 |
Heating oil swaps | — |  |  | 801 |  |  | — |  |  | 801 |
Diesel collars | — |  |  | 267 |  |  | — |  |  | 267 |
Total liabilities | $ | — |  |  | $ | 1,431 |  |  | $ | — |  |  | $ | 1,431 |
December 31, 2023 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 101,275 |  |  | $ | — |  |  | $ | — |  |  | $ | 101,275 |
Total assets | $ | 101,275 |  |  | $ | — |  |  | $ | — |  |  | $ | 101,275 |
Accrued and other current liabilities: |  |  |  |  |  |  |
Interest rate swap | $ | — |  |  | $ | 126 |  |  | $ | — |  |  | $ | 126 |
Heating oil swaps | — |  |  | 153 |  |  | — |  |  | 153 |
Diesel collars | — |  |  | 802 |  |  | — |  |  | 802 |
Total liabilities | $ | — |  |  | $ | 1,081 |  |  | $ | — |  |  | $ | 1,081 |
Carrying Values and Estimated Fair Values of Financial Instruments Not Required to be Recorded at Fair Value | The carrying values and estimated fair values of financial instruments that are not required to be recorded at fair value in the condensed consolidated balance sheets were as follows:
|  |  | September 30, 2024 |  | December 31, 2023
(in thousands) | Fair Value Hierarchy |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Assets: |  |  |  |  |  |  |  |  |
Held-to-maturity marketable securities (1) | Level 1 |  | $ | 10,147 |  |  | $ | 10,119 |  |  | $ | 35,863 |  |  | $ | 35,357 |
Liabilities (including current maturities): |  |  |  |  |  |  |  |  |
3.25% Convertible Notes (2) | Level 2 |  | $ | 373,750 |  |  | $ | 458,074 |  |  | $ | — |  |  | $ | — |
3.75% Convertible Notes (2) | Level 2 |  | $ | 373,750 |  |  | $ | 674,301 |  |  | $ | 373,750 |  |  | $ | 475,601 |
2.75% Convertible Notes (2) | Level 2 |  | $ | — |  |  | $ | — |  |  | $ | 31,338 |  |  | $ | 51,045 |
Credit Agreement - Term Loan (2) | Level 3 |  | $ | — |  |  | $ | — |  |  | $ | 150,000 |  |  | $ | 153,585 |
Credit Agreement - Revolver (2) | Level 3 |  | $ | — |  |  | $ | — |  |  | $ | 100,000 |  |  | $ | 102,317 |
(1) All marketable securities were classified as held-to-maturity and consisted of U.S. Government and agency obligations as of September 30, 2024 and December 31, 2023. (2) The fair values of our our 3.25% convertible senior notes due 2030 (the "3.25% Convertible Notes"), our 3.75% convertible senior notes due 2028 (the "3.75% Convertible Notes") and our 2.75% convertible senior notes due 2024 (the "2.75% Convertible Notes") are based on the median price of the notes in an active market. The fair value of the Credit Agreement is based on borrowing rates available to us for long-term loans with similar terms, average maturities, and credit risk. See Note 14 for more information about our convertible notes and the Credit Agreement.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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