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Segment Information - Reconciliation of Revenue (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]
Mining revenue	$ 302,958	$ 44,395		$ 129,810	$ 895,802
Other revenues	8,997	8,496		14,555	33,487
Revenues	311,955	52,891		144,365	929,289
Successor | Segment Reconciling Items
Segment Reporting Information [Line Items]
Other revenues	8,997	8,496		14,555	33,487
Predecessor
Segment Reporting Information [Line Items]
Mining revenue			$ 65,154
Other revenues			6,229
Revenues			71,383
Predecessor | Segment Reconciling Items
Segment Reporting Information [Line Items]
Other revenues			6,229
Mining | Successor | Operating Segments
Segment Reporting Information [Line Items]
Mining revenue	$ 302,958	$ 44,395		$ 129,810	$ 895,802
Mining | Predecessor | Operating Segments
Segment Reporting Information [Line Items]
Mining revenue			$ 65,154

X

- Definition

Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a),(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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