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Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2017
Successor
Segment Reporting Information [Line Items]
Capital Expenditures	$ 34,408	$ 2,435		$ 8,449	$ 62,671
Successor | Segment Reconciling Items
Segment Reporting Information [Line Items]
Capital Expenditures	283	354		1,025	2,024
Predecessor
Segment Reporting Information [Line Items]
Capital Expenditures			$ 5,422
Predecessor | Segment Reconciling Items
Segment Reporting Information [Line Items]
Capital Expenditures			834
Mining | Successor | Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	$ 34,125	$ 2,081		$ 7,424	$ 60,647
Mining | Predecessor | Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures			$ 4,588

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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