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Business Segments
 12 Months Ended
Dec. 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 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-K on a consolidated basis.

See Note 1 for additional discussion of the Company's reportable segments. All current operations reside in the U.S. The accounting policies of the reportable segments are described in Note 2 and Note 20.

In 2021 and 2020, two customers individually accounted for more than 10% of consolidated revenue. The following represents the revenue attributable to each of these entities as a percentage of consolidated revenue for those years:
Percentage of Consolidated Revenue
Segment20212020
Coal Mining customer43 %55 %
NAMining customer19 %19 %

In addition, for the year ended December 31, 2021, the Coal Mining segment derived approximately 68% of the Earnings of Unconsolidated Operations from two customers, Basin Electric and GRE.
The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
 20212020
Revenues
Coal Mining$91,851 $72,088 
NAMining69,924 42,392 
Minerals Management31,003 14,721 
Unallocated Items4,695 2,133 
Eliminations(5,627)(2,902)
Total$191,846 $128,432 
Operating profit (loss)
Coal Mining$49,059  $25,436 
NAMining109  1,872 
Minerals Management26,080  3,493 
Unallocated Items(19,553)(17,256)
Eliminations(285)(97)
Total$55,410  $13,448 
Expenditures for property, plant and equipment and acquisition of mineral interests
Coal Mining$16,830 $14,825 
NAMining21,100 13,862 
Minerals Management6,423 15,474 
Unallocated Items208 207 
Total$44,561 $44,368 
Depreciation, depletion and amortization
Coal Mining$16,649 $14,213 
NAMining4,435 2,470 
Minerals Management1,858 1,308 
Unallocated Items143 123 
Total$23,085 $18,114 

Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.