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Fair Value Measurement (Tables)
 9 Months Ended
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, 2024Level 1Level 2Level 3Total
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, 2024December 31, 2023
(in thousands)Fair Value HierarchyCarrying ValueFair
Value		Carrying ValueFair
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.