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Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 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
March 31, 2024Level 1Level 2Level 3Total
Cash equivalents
Money market funds$30,484 $— $— $30,484 
Other current assets
Interest rate swap$— $972 $— $972 
Commodity swaps— 1 — 1 
Total assets$30,484 $973 $— $31,457 
Accrued and other current liabilities
Diesel collars$— $208 $— $208 
Total liabilities$— $208 $— $208 
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 $— $126 
Commodity swaps— 153 — 153 
Diesel collars— 802 — 802 
Total liabilities$— $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:
March 31, 2024December 31, 2023
(in thousands)Fair Value HierarchyCarrying ValueFair
Value		Carrying ValueFair
Value
Assets:
Held-to-maturity marketable securities (1)Level 1$15,500 $15,176 $35,863 $35,357 
Liabilities (including current maturities):
3.75% Convertible Notes (2)
Level 2$373,750 $513,873 $373,750 $475,601 
2.75% Convertible Notes (2)
Level 2$31,338 $56,710 $31,338 $51,045 
Fourth Amended and Restated Credit Agreement - Term Loan (2)Level 3$148,125 $151,314 $150,000 $153,585 
Fourth Amended and Restated Credit Agreement - Revolver (2)Level 3$— $— $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 March 31, 2024 and December 31, 2023.
(2) The fair values of our 2.75% Convertible Notes and 3.75% Convertible Notes are based on the median price of the notes in an active market. The fair value of the Fourth Amended and Restated Credit Agreement, as amended (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 the 2.75% Convertible Notes, 3.75% Convertible Notes and the Credit Agreement.