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Acquisitions (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) | Jun. 29, 2015 USD ($) a | Jun. 12, 2015 USD ($) a well mi MMcf | Jun. 09, 2015 USD ($) a | Dec. 31, 2015 USD ($) | Jun. 29, 2015 USD ($) a | Apr. 30, 2015 USD ($) a | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Increase (decrease) in restricted cash |  |  |  |  |  |  |  | $ 0 | $ (75,005)
Paloma Partners III, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price | $ 302,300 |  |  |  |  |  | $ 301,900 |  |
Gas and oil acreage, net | a |  |  |  |  |  |  | 24,000 |  |
Amount put in escrow | $ 30,100 |  |  |  |  |  | $ 75,000 |  |
American Energy - Utica, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 405,400 |  |  |
Amount put in escrow |  |  |  | $ 67,100 |  |  |  |  |
Increase (decrease) in restricted cash |  |  |  |  | $ 2,400 |  |  |  |
Cash, net of purchase price adjustments |  | $ 405,000 | $ 405,029 |  |  |  |  |  |
Fair value of net identifiable assets acquired |  |  | 405,029 |  |  |  |  |  |
American Energy - Utica, LLC | Proved |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of net identifiable assets acquired |  |  | 70,804 |  |  |  |  |  |
American Energy - Utica, LLC | Unevaluated |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of net identifiable assets acquired |  |  | 334,225 |  |  |  |  |  |
Belmont And Jefferson Counties, Ohio | American Energy - Utica, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 68,200 |  |  |  |  |
Gross and net acres acquired | a |  |  |  | 6,198 |  |  |  |  |
Monroe County, Ohio | American Energy - Utica, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price |  | $ 18,200 | $ 319,000 |  |  |  |  |  |
Gas and oil acreage, net | a |  | 1,900 | 27,228 |  |  | 1,900 |  |  |
Gas and oil acreage, gross | a |  | 4,950 | 38,965 |  |  | 4,950 |  |  |
Daily production of well acquired | MMcf |  |  | 14.6 |  |  |  |  |  |
Gross wells acquired | well |  |  | 18 |  |  |  |  |  |
Net wells acquired | well |  |  | 11.3 |  |  |  |  |  |
Gas gathering system (in miles) | mi |  |  | 11 |  |  |  |  |  |
Number of well pad locations acquired | well |  |  | 4 |  |  |  |  |  |

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