v3.26.1
Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Restricted Cash Deposits
Amounts included in restricted cash provide collateral to secure the following obligations:
June 30, 2026December 31, 2025
Workers’ compensation and black lung obligations$118,045 $117,150 
Reclamation-related obligations1,294 959 
Financial payments and other performance obligations8,880 8,802 
Total long-term restricted cash$128,219 $126,911 
Schedule of Restricted Investments and Deposit Assets
Amounts included in restricted investments provide collateral to secure the following obligations:
June 30, 2026December 31, 2025
Workers’ compensation obligations$3,168 $3,172 
Reclamation-related obligations27,268 27,238 
Financial payments and other performance obligations4,017 3,946 
Total long-term restricted investments (1)
$34,453 $34,356 
(1) Classified as long-term trading securities as of June 30, 2026 and December 31, 2025.

Amounts included in deposits provide collateral to secure the following obligations:
June 30, 2026December 31, 2025
Workers’ compensation obligations$4,108 $4,108 
Other operating agreements683 684 
Total deposits 4,791 4,792 
Less current portion (29)— 
Total deposits, net of current portion (1)
$4,762 $4,792 
(1) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets.