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Business Segments (Tables) | 6 Months Ended
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Jun. 30, 2022
Segment Reporting [Abstract] |
Segment Reporting Information | The following tables present revenue, operating profit, depreciation expense and capital expenditures:
| THREE MONTHS ENDED |  | SIX MONTHS ENDED
| JUNE 30 |  | JUNE 30
| 2022 |  | 2021 |  | 2022 |  | 2021
Revenues |  |  |  |  |  |  |
Coal Mining | $ | 26,602 |  |  | $ | 20,689 |  |  | $ | 47,564 |  |  | $ | 42,631 |
NAMining | 22,814 |  |  | 19,860 |  |  | 44,218 |  |  | 37,799 |
Minerals Management | 11,962 |  |  | 5,608 |  |  | 24,716 |  |  | 11,108 |
Unallocated Items | 617 |  |  | 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 |
NAMining | 1,257 |  |  | 1,698 |  |  | 2,528 |  |  | 2,355 |
Minerals Management | 13,073 |  |  | 4,173 |  |  | 24,701 |  |  | 8,408 |
Unallocated Items | (5,952) |  |  | (4,795) |  |  | (11,391) |  |  | (9,568) |
Eliminations | 130 |  |  | (33) |  |  | 262 |  |  | 21 |
Total | $ | 29,683 |  |  | $ | 8,670 |  |  | $ | 44,627 |  |  | $ | 17,000 |
| THREE MONTHS ENDED |  | SIX MONTHS ENDED
| JUNE 30 |  | JUNE 30
| 2022 |  | 2021 |  | 2022 |  | 2021
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  |  |  |  |
Coal Mining | $ | 6,280 |  |  | $ | 3,115 |  |  | $ | 8,000 |  |  | $ | 4,732 |
NAMining | 6,561 |  |  | 2,952 |  |  | 8,381 |  |  | 5,818 |
Minerals Management | 116 |  |  | 5,105 |  |  | 949 |  |  | 5,498 |
Unallocated Items | 7,312 |  |  | 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 |
NAMining | 1,493 |  |  | 984 |  |  | 2,960 |  |  | 1,935 |
Minerals Management | 543 |  |  | 522 |  |  | 1,121 |  |  | 969 |
Unallocated Items | 64 |  |  | 38 |  |  | 108 |  |  | 70 |
Total | $ | 6,488 |  |  | $ | 5,617 |  |  | $ | 12,615 |  |  | $ | 11,202 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 + Details
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