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Business Segments
 3 Months Ended
Mar. 31, 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, depreciation expense and capital expenditures:
 THREE MONTHS ENDED
 MARCH 31
 2022 2021
Revenues
Coal Mining$20,962  $21,942 
NAMining21,404  17,939 
Minerals Management12,754 5,500 
Unallocated Items192 143 
Eliminations(289)(419)
Total$55,023  $45,105 
Operating profit (loss)   
Coal Mining$7,352  $8,157 
NAMining1,271  657 
Minerals Management11,628 4,235 
Unallocated Items(5,439)(4,773)
Eliminations132 54 
Total$14,944  $8,330 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,720 $1,617 
NAMining1,820 2,866 
Minerals Management833 393 
Unallocated Items276 — 
Total$4,649  $4,876 
Depreciation, depletion and amortization
Coal Mining$4,038 $4,155 
NAMining1,467 951 
Minerals Management578 447 
Unallocated Items44 32 
Total$6,127 $5,585