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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 41,352	$ 33,681	$ 81,449	$ 64,881
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	21,879	20,174	37,964	37,195
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	19,473	13,507	43,485	27,686
Operating segments | Coal Mining
Disaggregation of Revenue [Line Items]
Revenues	22,570	20,860	39,320	38,457
Operating segments | NAMining
Disaggregation of Revenue [Line Items]
Revenues	10,728	9,067	21,503	19,280
Operating segments | Minerals Management
Disaggregation of Revenue [Line Items]
Revenues	8,242	3,866	20,928	7,342
Unallocated Items
Disaggregation of Revenue [Line Items]
Revenues	131	0	674	0
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (319)	$ (112)	$ (976)	$ (198)

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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