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Acquisitions (Details) a in Thousands, Mcfe in Thousands, $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2017 a | Feb. 27, 2017 a Mcfe well mi | Feb. 01, 2017 a | Sep. 30, 2017 USD ($)
Bankruptcy Auction |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of property acquired (in acres) | a |  | 85 |  |
Number of acres with drilling rights (in acres) | a |  | 44 |  |
Production of well (in Mcfe) | Mcfe |  | 110 |  |
Number of wells acquired | well |  | 174 |  |
Number of producing wells acquired | well |  | 120 |  |
Number of miles of pipeline acquired | mi |  | 20 |  |
Allegheny, Washington, and Westmore Counties |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of property acquired (in acres) | a | 11 |  |  |
2017 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses | $ |  |  |  | $ 740.1
Property, plant, and equipment assumed | $ |  |  |  | 750.1
Current liabilities assumed | $ |  |  |  | 5.3
Noncurrent liabilities, assumed | $ |  |  |  | $ 4.7
Marion, Monongalia, and Wetzel Counties |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of property acquired (in acres) | a |  |  | 14 |

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