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Business Segments
 6 Months Ended
Jun. 30, 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 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 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 ENDEDSIX MONTHS ENDED
 JUNE 30JUNE 30
 2021 20202021 2020
Revenues
Coal Mining$23,063  $21,573 $46,802 $42,501 
NAMining17,486  12,048 33,628 23,672 
Minerals Management5,608 1,987 11,108 7,228 
Unallocated Items910 327 1,053 353 
Eliminations(1,171)(580)(1,590)(755)
Total$45,896  $35,355 $91,001 $72,999 
Operating profit (loss)   
Coal Mining$8,542  $7,498 $17,226 $14,683 
NAMining783  544 913 1,275 
Minerals Management4,173 510 8,408 4,777 
Unallocated Items(4,795)(4,158)(9,568)(8,718)
Eliminations(33)88 21 45 
Total$8,670  $4,482 $17,000 $12,062 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$3,115 $3,844 $4,732 $4,667 
NAMining2,952 3,163 5,818 7,186 
Minerals Management5,105 276 5,498 739 
Unallocated Items79 158 79 207 
Total$11,251  $7,441 $16,127 $12,799 
Depreciation, depletion and amortization
Coal Mining$4,127 $3,615 $8,334 $7,158 
NAMining930 652 1,829 1,298 
Minerals Management522 327 969 654 
Unallocated Items38 30 70 58 
Total$5,617 $4,624 $11,202 $9,168