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Business Segments
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Business Segments Business Segments
The Company’s operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. The Company determines its reportable segments by first identifying its operating segments, and then by assessing whether any components of these segments constitute a business for which discrete financial information is available and where segment management regularly reviews the operating results of that component. The Company’s Chief Operating Decision Maker utilizes operating profit to evaluate segment performance and allocate resources.

The Company has items not directly attributable to a reportable segment that are not included as part of the measurement of segment operating profit. These items primarily include administrative costs related to public company reporting requirements at the parent company and the financial results of Mitigation Resources and Bellaire. Mitigation Resources generates and sells stream and wetland mitigation credits (known as mitigation banking) and provides services to those engaged in permittee-responsible stream and wetland mitigation. Bellaire manages the Company’s long-term liabilities related to former Eastern U.S. underground mining activities.

All financial statement line items below operating profit (other income including interest expense and interest income, the (benefit) provision for income taxes and net income) are presented and discussed within this Form 10-Q on a consolidated basis.
The following table presents revenues, operating (loss) profit, expenditures for property, plant and equipment and acquisition of mineral interests and depreciation, depletion and amortization expense:
 THREE MONTHS ENDEDNINE MONTHS ENDED
 SEPTEMBER 30SEPTEMBER 30
 2023 20222023 2022
Revenues
Coal Mining$18,665  $22,599 $65,661 $70,163 
NAMining21,722  22,962 64,071 67,180 
Minerals Management5,747 16,172 23,203 40,888 
Unallocated Items966 1,092 6,785 1,901 
Eliminations(554)(1,032)(1,683)(1,947)
Total$46,546  $61,793 $158,037 $178,185 
Operating (loss) profit
   
Coal Mining$(4,697) $6,089 $(9,059)$34,616 
NAMining866  (210)3,910 2,318 
Minerals Management3,610 10,616 16,943 35,317 
Unallocated Items(6,027)(6,780)(14,445)(18,171)
Eliminations(19)103 (52)365 
Total$(6,267) $9,818 $(2,703)$54,445 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,469 $3,141 $5,187 $11,141 
NAMining21,450 604 30,380 8,985 
Minerals Management776 11,397 1,758 12,346 
Unallocated Items64 1,944 569 9,532 
Total$23,759  $17,086 $37,894 $42,004 
Depreciation, depletion and amortization
Coal Mining$4,336 $4,257 $12,924 $12,683 
NAMining2,058 1,585 5,799 4,545 
Minerals Management768 660 2,328 1,781 
Unallocated Items158 67 378 175 
Total$7,320 $6,569 $21,429 $19,184