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Acquisitions (Details) a in Thousands, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Feb. 27, 2017 USD ($) a Mcfe well mi | Feb. 01, 2017 USD ($) a | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses, gross |  |  | $ 669,479 | $ 0
Bankruptcy Auction |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of property acquired (in acres) | a | 85 |  |  |
Payments to acquire businesses, gross | $ 522,500 |  |  |
Number of acres with drilling rights (in acres) | a | 44 |  |  |
Production of well (in MMcfe) | Mcfe | 110 |  |  |
Number of wells acquired | well | 174 |  |  |
Number of miles of pipeline acquired | mi | 20 |  |  |
First Quarter 2017 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses, gross |  |  | 652,500 |
PP&E acquired |  |  | 664,400 |
Current liabilities assumed |  |  | 7,200 |
Noncurrent liabilities assumed |  |  | 4,700 |
2016 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses, gross |  |  | 17,000 |
Capital expenditures incurred but not yet paid |  |  | $ 3,500 |
Marion, Monongalia, and Wetzel Counties |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Area of property acquired (in acres) | a |  | 14 |  |
Payments to acquire businesses, gross |  | $ 130,000 |  |

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