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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 37,644	$ 40,097
Goods transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	20,284	16,086
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	17,360	24,011
Operating segments | Coal Mining
Disaggregation of Revenue [Line Items]
Revenues	20,928	16,750
Operating segments | NAMining
Disaggregation of Revenue [Line Items]
Revenues	11,624	10,775
Operating segments | Minerals Management
Disaggregation of Revenue [Line Items]
Revenues	5,241	12,686
Unallocated Items
Disaggregation of Revenue [Line Items]
Revenues	26	543
Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ (175)	$ (657)

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ 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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