Business Segments (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Segment Reporting Information

The following tables present revenue, operating profit, depreciation expense and capital expenditures:

	THREE MONTHS ENDED				NINE MONTHS ENDED
	SEPTEMBER 30				SEPTEMBER 30
	2020		2019		2020		2019
Revenues
Coal Mining	$	20,395	$	18,799	$	62,896	$	58,119
NAMining	9,443		8,993		33,115		30,496
Minerals Management	2,722		5,022		9,950		25,950
Unallocated Items	904		52		1,257		726
Eliminations	(1,169)		(263)		(1,924)		(1,239)
Total	$	32,295	$	32,603	$	105,294	$	114,052
Operating profit (loss)
Coal Mining	$	11,174	$	10,492	$	25,857	$	27,761
NAMining	244		(358)		1,519		(743)
Minerals Management	1,673		3,900		6,450		22,358
Unallocated Items	(3,623)		(5,470)		(12,341)		(15,336)
Eliminations	(70)		99		(25)		157
Total	$	9,398	$	8,663	$	21,460	$	34,197

Expenditures for property, plant and equipment
Coal Mining	$	3,150	$	2,291	$	7,817	$	6,542
NAMining	3,220		4,971		10,406		6,213
Minerals Management	633		—		1,372		291
Unallocated Items	—		35		207		218
Total	$	7,003	$	7,297	$	19,802	$	13,264
Depreciation, depletion and amortization
Coal Mining	$	3,793	$	3,102	$	10,951	$	9,252
NAMining	723		588		2,021		1,699
Minerals Management	327		324		981		1,057
Unallocated Items	33		30		91		87
Total	$	4,876	$	4,044	$	14,044	$	12,095