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Business Segments
 9 Months Ended
Sep. 30, 2022
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 provision for income taxes and net income) are presented and discussed within this Form 10-Q on a consolidated basis.
As discussed in Note 1, the Company retrospectively changed its computation of segment operating profit to reclassify the results of Caddo Creek and Demery from the Coal Mining segment into the NAMining segment. See Note 1 for additional discussion of the Company's reportable segments. The following tables present revenue, operating profit, capital expenditures and depreciation expense:
 THREE MONTHS ENDEDNINE MONTHS ENDED
 SEPTEMBER 30SEPTEMBER 30
 2022 20212022 2021
Revenues
Coal Mining$22,599  $20,946 $70,163 $63,577 
NAMining22,962  20,429 67,180 58,228 
Minerals Management16,172 10,607 40,888 21,715 
Unallocated Items1,092 1,594 1,901 2,647 
Eliminations(1,032)(1,834)(1,947)(3,424)
Total$61,793  $51,742 $178,185 $142,743 
Operating profit (loss)   
Coal Mining$6,089  $21,985 $34,616 $37,769 
NAMining(210) 1,448 2,318 3,803 
Minerals Management10,616 9,454 35,317 17,862 
Unallocated Items(6,780)(5,170)(18,171)(14,738)
Eliminations103 (125)365 (104)
Total$9,818  $27,592 $54,445 $44,592 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$3,141 $5,646 $11,141 $10,378 
NAMining604 13,309 8,985 19,127 
Minerals Management11,397 450 12,346 5,948 
Unallocated Items1,944 2 9,532 81 
Total$17,086  $19,407 $42,004 $35,534 
Depreciation, depletion and amortization
Coal Mining$4,257 $4,306 $12,683 $12,534 
NAMining1,585 1,031 4,545 2,966 
Minerals Management660 423 1,781 1,392 
Unallocated Items67 36 175 106 
Total$6,569 $5,796 $19,184 $16,998