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Business Segments (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segment Reporting Information

	THREE MONTHS ENDED
	MARCH 31
	2019				2018
Revenues
Coal Mining	$	16,750			$	17,597
NAMining	10,775				10,213
Minerals Management	12,686				3,476
Unallocated Items	543				—
Eliminations	(657		)		(86		)
Total	$	40,097			$	31,200
Operating profit (loss)
Coal Mining	$	7,605			$	8,697
NAMining	32				634
Minerals Management	11,669				2,944
Unallocated Items	(2,699		)		(2,554		)
Eliminations	(234		)		—
Total	$	16,373			$	9,721

Expenditures for property, plant and equipment
Coal Mining	$	3,870			$	576
NAMining	—				674
Minerals Management	241				1,032
Unallocated Items	141				170
Total	$	4,252			$	2,452
Depreciation, depletion and amortization
Coal Mining	$	2,874			$	2,841
NAMining	545				395
Minerals Management	366				134
Unallocated Items	28				27
Total	$	3,813			$	3,397

X

- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 280
-SubTopic 10
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