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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2016 | Apr. 30, 2015 | Dec. 31, 2014 | Oct. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Acquisitions of oil and gas |  |  |  |  |  | $ 0 | $ 16,312 | $ 214,737
Gain (loss) on sale of assets |  |  |  |  |  | (1,857) | 3,866 | 17,120
Proceeds from sale of assets |  |  |  |  |  | $ 50,419 | $ 7,653 | $ 39,492
Oil and gas properties, proved and unproved | Eagle Ford Shale in South Texas |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Acquisition cost of proved and unproved oil and gas properties |  |  | $ 30,500 | $ 210,000 |  |  |  |
Acquisitions of oil and gas |  | $ 16,000 | $ 29,900 | 185,200 |  |  |  |
Adjustment to acquisition cost, consents for leaseholds |  |  |  | 17,400 |  |  |  |
Adjustment to acquisition cost, customary purchase price adjustment |  |  |  | 7,400 |  |  |  |
Acquisition, assumed liability related to asset retirement obligations |  |  |  | 1,200 |  |  |  |
Oil and gas properties, proved and unproved | East Texas |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Gain (loss) on sale of assets | $ 500 |  |  | 19,900 |  |  |  |
Proceeds from sale of assets | $ 56,400 |  |  | $ 44,300 | $ 6,300 |  |  |
Oil and gas properties | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |
Capital rate |  |  | 10.00% |  |  | 10.00% |  |

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