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Business Segments
 6 Months Ended
Jun. 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, which include primarily 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 profit (loss), expenditures for property, plant and equipment and acquisition of mineral interests and depreciation, depletion and amortization expense:
 THREE MONTHS ENDEDSIX MONTHS ENDED
 JUNE 30JUNE 30
 2023 20222023 2022
Revenues
Coal Mining$26,343  $26,602 $46,996 $47,564 
NAMining21,716  22,814 42,349 44,218 
Minerals Management9,171 11,962 17,456 24,716 
Unallocated Items4,628 617 5,819 809 
Eliminations(508)(626)(1,129)(915)
Total$61,350  $61,369 $111,491 $116,392 
Operating profit (loss)   
Coal Mining$(4,675) $21,175 $(4,362)$28,527 
NAMining2,214  1,257 3,044 2,528 
Minerals Management7,289 13,073 13,333 24,701 
Unallocated Items(3,065)(5,952)(8,418)(11,391)
Eliminations(13)130 (33)262 
Total$1,750  $29,683 $3,564 $44,627 
THREE MONTHS ENDEDSIX MONTHS ENDED
JUNE 30JUNE 30
2023202220232022
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,032 $6,280 $3,718 $8,000 
NAMining4,507 6,561 8,930 8,381 
Minerals Management638 116 982 949 
Unallocated Items79 7,312 505 7,588 
Total$6,256  $20,269 $14,135 $24,918 
Depreciation, depletion and amortization
Coal Mining$4,348 $4,388 $8,588 $8,426 
NAMining1,855 1,493 3,741 2,960 
Minerals Management749 543 1,560 1,121 
Unallocated Items138 64 220 108 
Total$7,090 $6,488 $14,109 $12,615