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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Successor |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Throughput obligation | $ 0 |  |  |  | $ 0 |
Future minimum operating lease payments | 0 |  |  |  | 0 | $ 0
Coal royalty expense | 22,300,000 | $ 2,700,000 |  | $ 6,700,000 | 74,500,000 |
Successor | Indemnifications |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Remaining maximum exposure | 200,000 |  |  |  | 200,000 |
Successor | Other long-term liabilities | Indemnifications |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Indemnification accrual | $ 300,000 |  |  |  | $ 300,000 | 300,000
Successor | Accrued expenses |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Throughput obligation |  |  |  |  |  | $ 2,100,000
Predecessor |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Coal royalty expense |  |  | $ 3,600,000 |  |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + 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 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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