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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2026
Segment Reporting [Abstract]  
Schedule of Segment Operating Results and Capital Expenditures
Met reportable segment results for the three and six months ended June 30, 2026 and 2025 are as follows:

Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
Coal revenues$491,505 $548,675 $1,015,038 $1,078,342 
Other revenues1,351 1,599 2,805 3,889 
Total revenues$492,856 $550,274 $1,017,843 $1,082,231 
Non-GAAP cost of coal sales$365,789 $388,844 $754,092 $803,513 
Freight and handling costs70,220 84,589 146,434 168,513 
Idled and closed mine costs7,654 6,520 17,526 12,511 
Cost of coal sales (exclusive of items shown separately below)$443,663 $479,953 $918,052 $984,537 
Depreciation, depletion and amortization$36,044 $44,822 $75,970 $88,732 
Accretion on asset retirement obligations5,214 5,508 10,429 11,122 
Amortization of acquired intangibles876 1,357 1,752 2,714 
Selling, general and administrative expenses17,257 15,216 33,855 30,640 
Interest expense962 761 1,803 1,524 
Interest income(2,919)(4,199)(7,125)(8,245)
Equity loss in affiliates6,717 8,736 12,450 13,696 
Other segment items (1)
3,889 4,322 5,862 9,097 
Income tax benefit(6,595)(1,248)(11,921)(12,685)
Total other expenses$61,445 $75,275 $123,075 $136,595 
Net loss$(12,252)$(4,954)$(23,284)$(38,901)
(1) Other segment items include Other operating loss (income) and Miscellaneous expense, net.
The following tables present additional information on the Company’s revenues and top customers:
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
Total coal revenues$491,505 $548,675 $1,015,038 $1,078,342 
Total revenues$492,856 $550,274 $1,017,843 $1,082,231 
Export coal revenues$353,683 $394,979 $757,104 $790,694 
Export coal revenues as % of total coal revenues72 %72 %75 %73 %
Countries with export coal revenue exceeding 10% of total revenuesIndia, Turkey, BrazilIndia, BrazilIndia, TurkeyIndia
Top customer as % of total revenues15 %16 %13 %14 %
Top 10 customers as % of total revenues73 %80 %76 %80 %
Number of customers exceeding 10% of total revenues2334
As of June 30,
20262025
Number of customers exceeding 10% of total trade accounts receivable, net33