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Business Segments
 6 Months Ended
Jun. 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, depreciation expense and capital expenditures:
 THREE MONTHS ENDEDSIX MONTHS ENDED
 JUNE 30JUNE 30
 2022 20212022 2021
Revenues
Coal Mining$26,602  $20,689 $47,564 $42,631 
NAMining22,814  19,860 44,218 37,799 
Minerals Management11,962 5,608 24,716 11,108 
Unallocated Items617 910 809 1,053 
Eliminations(626)(1,171)(915)(1,590)
Total$61,369  $45,896 $116,392 $91,001 
Operating profit (loss)   
Coal Mining$21,175  $7,627 $28,527 $15,784 
NAMining1,257  1,698 2,528 2,355 
Minerals Management13,073 4,173 24,701 8,408 
Unallocated Items(5,952)(4,795)(11,391)(9,568)
Eliminations130 (33)262 21 
Total$29,683  $8,670 $44,627 $17,000 
THREE MONTHS ENDEDSIX MONTHS ENDED
JUNE 30JUNE 30
2022202120222021
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$6,280 $3,115 $8,000 $4,732 
NAMining6,561 2,952 8,381 5,818 
Minerals Management116 5,105 949 5,498 
Unallocated Items7,312 79 7,588 79 
Total$20,269  $11,251 $24,918 $16,127 
Depreciation, depletion and amortization
Coal Mining$4,388 $4,073 $8,426 $8,228 
NAMining1,493 984 2,960 1,935 
Minerals Management543 522 1,121 969 
Unallocated Items64 38 108 70 
Total$6,488 $5,617 $12,615 $11,202