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Sale and Exchange of Properties Sale and Exchange of Properties (Details) a in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 USD ($) a well | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net acres received | a | 73 |  |  |  |
Number of producing wells received | well | 900 |  |  |  |
Net acres transferred | a | 138 |  |  |  |
Number of producing vertical wells transferred | well | 2,000 |  |  |  |
Ownership interest transferred | 50.00% |  |  |  |
Amount of cash transferred | $ 167,300 |  | $ 157,300 | $ 0 | $ 157,256
Nonconsolidated investment | 50.00% |  | 50.00% |  | 50.00%
Fair value of assets exchanged | $ 516,500 |  | $ 516,500 |  | $ 516,500
Gain on sale / exchange of assets | 34,100 | $ 0 | 37,749 | $ 0 | 37,749
Pre-tax gain related to the de-designation of derivative instruments | 28,000 |  |  |  |
Acreage |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Fair value of assets exchanged | 318,300 |  | 318,300 |  | 318,300
Wells |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Fair value of assets exchanged | $ 198,200 |  | $ 198,200 |  | $ 198,200

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