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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 05, 2015
Predecessor | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | $ 1.4 |  |  |
Black Warrior Methane (BWM) |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Proportionate consolidation method, ownership percentage |  |  |  |  |  | 50.00%
Black Warrior Transmission (BWT) |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00%
Allocated Expenses to Joint Venture | Successor | Corporate Joint Venture |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party | $ 1.3 | $ 1.3 |  | $ 0.5 | $ 0.9 |
Allocated Expenses to Joint Venture | Predecessor | Corporate Joint Venture |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party |  |  | $ 0.3 |  |  |

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + 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(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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