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Business Segments | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Business Segments | Business Segments In the first quarter of 2019, the Company changed its reportable segments to reflect changes in the business, including growth at NAMining and Minerals Management. As of January 1, 2019, the Company’s operating segments are: (i) Coal Mining, (ii) NAMining and (iii) Minerals Management. While the Company continues to pursue opportunities to add new coal mining operations to the Coal Mining segment, the NAMining segment will serve as the platform for pursuing non-coal mining projects and the Minerals Management segment will work to capitalize on the Company’s oil, gas and coal reserves. 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. Operating profit for each segment includes an allocation of shared costs based on a reasonable measure of utilization. The Company also has costs not directly attributable to a reportable segment which are not included as part of the measurement of segment operating profit, primarily administrative costs related to public company reporting requirements, the financial results of the Company’s mitigation banking business, Mitigation Resources of North America® (“MRNA”), and Bellaire. MRNA 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. Transactions between segments are accounted for as third-party arrangements for purposes of presenting segment results of operations and are eliminated in consolidation. 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. Included within other income on the line Income from other unconsolidated affiliates within the Consolidated Statements of Operations is the financial results of NoDak Energy Services, LLC ("NoDak"). NoDak operates and maintains a coal drying system at a customer’s power plant. The NoDak contract expired in the first quarter of 2020. 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. In 2019, two customers and an oil and gas lessee individually accounted for more than 10% of consolidated revenue. In 2018, 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
Customer | Segment |  | 2019 |  | 2018 |
Choctaw Generation Limited Partnership, LLLP | Coal Mining |  | 48 | % |  | 60 | % |
CEMEX | NAMining |  | 21 | % |  | 20 | % |
Ascent Resources | Minerals Management |  | 12 | % |  | n/a |  |
In addition, for the year ended December 31, 2019, the Coal Mining segment derived approximately 60% of the Earnings of Unconsolidated Operations from two customers, Basin Electric Power Cooperative and Great River Energy. The following tables present revenue, operating profit, depreciation expense and capital expenditures for the years ended December 31:
| 2019 |  | 2018
Revenues |  |  |
Coal Mining | $ | 68,701 |  |  | $ | 81,549 |
NAMining | 42,823 |  |  | 36,950 |
Minerals Management | 30,119 |  |  | 17,352 |
Unallocated Items | 790 |  |  | 665 |
Eliminations | (1,443 | ) |  | (1,141 | )
Total | $ | 140,990 |  |  | $ | 135,375 |
Operating profit (loss) |  |  |
Coal Mining | $ | 23,268 |  |  | $ | 38,270 |
NAMining | (696 | ) |  | 1,918 |
Minerals Management | 25,721 |  |  | 14,331 |
Unallocated Items | (9,729 | ) |  | (10,473 | )
Eliminations | 256 |  |  | (422 | )
Total | $ | 38,820 |  |  | $ | 43,624 |
| 2019 |  | 2018
Expenditures for property, plant and equipment |  |  |
Coal Mining | $ | 15,092 |  |  | $ | 8,816 |
NAMining | 8,824 |  |  | 9,824 |
Minerals Management | 517 |  |  | 1,406 |
Unallocated Items | 231 |  |  | 884 |
Total | $ | 24,664 |  |  | $ | 20,930 |
Depreciation, depletion and amortization |  |  |
Coal Mining | $ | 12,409 |  |  | $ | 11,874 |
NAMining | 2,223 |  |  | 1,509 |
Minerals Management | 1,362 |  |  | 951 |
Unallocated Items | 246 |  |  | 349 |
Total | $ | 16,240 |  |  | $ | 14,683 |
Asset information by segment is not discretely maintained for internal reporting or used in evaluating performance.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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