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Fair Value Measurement | 12 Months Ended
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Dec. 31, 2024
Fair Value Measurements, Nonrecurring Value Measurement [Abstract] |
Fair Value Measurement | 8. Fair Value Measurement The following tables summarize significant assets and liabilities measured at fair value in the consolidated balance sheets on a recurring basis for each of the fair value levels (in thousands):
| Fair Value Measurement at Reporting Date Using
December 31, 2024 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 73,031 |  |  | $ | — |  |  | $ | — |  |  | $ | 73,031 |
Total assets | $ | 73,031 |  |  | $ | — |  |  | $ | — |  |  | $ | 73,031 |
Accrued and other current liabilities: |  |  |  |  |  |  |
Heating oil swaps | $ | — |  |  | $ | 531 |  |  | $ | — |  |  | $ | 531 |
Diesel collars | — |  |  | 177 |  |  | — |  |  | 177 |
Total liabilities | $ | — |  |  | $ | 708 |  |  | $ | — |  |  | $ | 708 |
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 |
Interest Rate Swap In connection with entering into Amendment No. 2 of the Fourth Amended and Restated Credit Agreement in November 2023, we entered into an interest rate swap designated as a cash flow hedge with an initial notional amount of $75.0 million and an effective date of December 2023 and a maturity date of June 2027. In conjunction with the payoff of our term loan in June 2024, the interest rate swap was terminated resulting in an immaterial gain. Commodity Derivatives In 2023 and 2024, we entered into collar contracts and commodity swaps to reduce our price exposure on diesel consumption and heating oil consumption, respectively. The collars and swaps were not designated as hedges and will be treated as a mark-to-market derivative instruments through their maturity dates. The financial statement impact of the collar contracts and commodity swaps was immaterial for the years ended December 31, 2024 and 2023. In April 2024 and December 2022, we entered into commodity swaps designated as cash flow hedges to reduce our price exposure on crude oil with maturity dates of October 31, 2024 and October 31, 2023, respectively. The financial statement impact of these swaps was immaterial during the years ended December 31, 2024, 2023 and 2022. Other Assets and Liabilities The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in the consolidated balance sheets were as follows (in thousands):
(in thousands) |  |  | December 31, 2024 |  | December 31, 2023
| Fair Value Hierarchy |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Assets: |  |  |  |  |  |  |  |  |
Held-to-maturity marketable securities (1) | Level 1 |  | $ | 7,311 |  |  | $ | 7,312 |  |  | $ | 35,863 |  |  | $ | 35,357 |
Liabilities (including current maturities): |  |  |  |  |  |  |  |  |
3.75% Convertible Notes (2) | Level 2 |  | $ | 373,750 |  |  | $ | 738,724 |  |  | $ | 373,750 |  |  | $ | 475,601 |
3.25% Convertible Notes (2) | Level 2 |  | $ | 373,750 |  |  | $ | 491,582 |  |  | $ | — |  |  | $ | — |
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 December 31, 2024 and 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. The carrying value of marketable securities approximates their fair value as determined by market quotes. Rates currently available to us for debt with similar terms and remaining maturities are used to estimate the fair value of existing debt. The carrying value of receivables and other amounts arising out of normal contract activities, including retentions, which may be settled beyond one year, is estimated to approximate fair value. At least annually, we measure certain nonfinancial assets and liabilities at fair value on a nonrecurring basis. As of December 31, 2024 and 2023, the nonfinancial assets and liabilities included our asset retirement and reclamation obligations, as well as assets and corresponding liabilities associated with performance guarantees. Asset retirement and reclamation obligations were measured using Level 3 inputs and performance guarantees were measured using Level 2 inputs. Asset retirement and reclamation obligations were initially measured using internal discounted cash flow calculations based upon our estimates of future retirement costs. To determine the fair value of the obligation, we estimate the cost for a third-party to perform the legally required reclamation including a reasonable profit margin. This cost is then increased for future estimated inflation based on the estimated years to complete and discounted to fair value using present value techniques with a credit-adjusted, risk-free rate. In estimating the settlement date, we evaluate the current facts and conditions to determine the most likely settlement date. We review reclamation obligations at least annually for a revision to the cost or a change in the estimated settlement date. Additionally, reclamation obligations are reviewed in the period that a triggering event occurs that would result in either a revision to the cost or a change in the estimated settlement date. See Note 11 for details of the asset retirement obligation balances. We estimate our liability for performance guarantees for our unconsolidated construction joint ventures and line item joint ventures using estimated partner bond rates, which are Level 2 inputs, and include them in accrued expenses and other current liabilities (see Note 13) with a corresponding increase in equity in construction joint ventures in the consolidated balance sheets. See Note 1 for further discussion of performance guarantees. During the years ended December 31, 2024 and 2023, we had no material nonfinancial asset and liability fair value adjustments.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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