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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Restricted Cash Deposits
Amounts included in restricted cash provide collateral to secure the following obligations:
 March 31, 2024December 31, 2023
Workers’ compensation and black lung obligations$107,208 $104,998 
Reclamation-related obligations3,922 685 
Financial payments and other performance obligations10,797 10,235 
Total restricted cash$121,927 $115,918 
Schedule of Restricted Investments and Deposit Assets
Amounts included in restricted investments provide collateral to secure the following obligations:
 March 31, 2024December 31, 2023
Workers’ compensation obligations$3,279 $2,514 
Reclamation-related obligations30,305 33,173 
Financial payments and other performance obligations4,471 4,910 
Total restricted investments (1)
$38,055 $40,597 
(1) Classified as long-term trading securities as of March 31, 2024 and December 31, 2023.

Amounts included in deposits provide collateral to secure the following obligations:
 March 31, 2024December 31, 2023
Workers’ compensation obligations$4,500 $4,500 
Financial payments and other performance obligations— 32 
Other operating agreements847 850 
Total deposits 5,347 5,382 
Less current portion — (32)
Total deposits, net of current portion (1)
$5,347 $5,350 
(1) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets.