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Business Segments
 3 Months Ended
Mar. 31, 2021
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 which are not included as part of the measurement of segment operating profit, which are primarily administrative costs related to public company reporting requirements at the parent company and the financial results of Mitigation Resources of North America® (“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.
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
 2021 2020
Revenues
Coal Mining$23,739  $20,928 
NAMining16,142  11,624 
Minerals Management5,500 5,241 
Unallocated Items143 26 
Eliminations(419)(175)
Total$45,105  $37,644 
Operating profit (loss)   
Coal Mining$8,684  $7,185 
NAMining130  731 
Minerals Management4,235 4,267 
Unallocated Items(4,773)(4,560)
Eliminations54 (43)
Total$8,330  $7,580 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$1,617 $823 
NAMining2,866 4,023 
Minerals Management393 463 
Unallocated Items— 49 
Total$4,876  $5,358 
Depreciation, depletion and amortization
Coal Mining$4,207 $3,543 
NAMining899 646 
Minerals Management447 327 
Unallocated Items32 28 
Total$5,585 $4,544