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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 |  |

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- 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 + Details
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