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Revenue
 6 Months Ended
Jun. 30, 2026
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue from Contracts with Customers

The Company earns revenues primarily through the sale of coal produced by Company operations and coal purchased from third parties. The Company extracts, processes and markets met and thermal coal from deep and surface mines for sale to steel and coke producers, industrial customers, and electric utilities.

The Company has disaggregated revenue between met coal and thermal coal and export and domestic revenues which depicts the pricing and contract differences between the two. Export revenue generally is derived by spot or short-term contracts with pricing determined at the time of shipment or based on a market index, whereas domestic revenue is characterized by contracts that typically have a term of one year or longer and with fixed pricing terms. 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 

Performance Obligations

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.