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Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 40,097	$ 31,200
Operating profit (loss)	16,373	9,721
Expenditures for property, plant and equipment	4,252	2,452
Depreciation, depletion and amortization	3,813	3,397
Operating segments | Coal Mining
Segment Reporting Information [Line Items]
Revenues	16,750	17,597
Operating profit (loss)	7,605	8,697
Expenditures for property, plant and equipment	3,870	576
Depreciation, depletion and amortization	2,874	2,841
Operating segments | NAMining
Segment Reporting Information [Line Items]
Revenues	10,775	10,213
Operating profit (loss)	32	634
Expenditures for property, plant and equipment	0	674
Depreciation, depletion and amortization	545	395
Operating segments | Minerals Management
Segment Reporting Information [Line Items]
Revenues	12,686	3,476
Operating profit (loss)	11,669	2,944
Expenditures for property, plant and equipment	241	1,032
Depreciation, depletion and amortization	366	134
Unallocated Items
Segment Reporting Information [Line Items]
Revenues	543	0
Operating profit (loss)	(2,699)	(2,554)
Expenditures for property, plant and equipment	141	170
Depreciation, depletion and amortization	28	27
Eliminations
Segment Reporting Information [Line Items]
Revenues	(657)	(86)
Operating profit (loss)	$ (234)	$ 0

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