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Revenue (Tables)
 6 Months Ended
Jun. 30, 2026
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors:
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
Export met coal revenues$325,304 $378,021 $717,715 $754,761 
Export thermal coal revenues28,379 16,958 39,389 35,933 
Total export coal revenues$353,683 $394,979 $757,104 $790,694 
Domestic met coal revenues$128,215 $147,377 $241,986 $276,039 
Domestic thermal coal revenues9,607 6,319 15,948 11,609 
Total domestic coal revenues$137,822 $153,696 $257,934 $287,648 
Total met coal revenues$453,519 $525,398 $959,701 $1,030,800 
Total thermal coal revenues37,986 23,277 55,337 47,542 
Total coal revenues$491,505 $548,675 $1,015,038 $1,078,342 
Schedule of Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of June 30, 2026:
Remainder of 20262027202820292030Total
Estimated coal revenues (1)
$53,203 $54,370 $16,800 $— $— $124,373 
(1) Amounts include only estimated coal revenues associated with customer contracts with fixed pricing and original expected duration of more than one year. Refer to Note 3 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.