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Acquisitions, Divestitures, and Assets Held for Sale Fair Value of Acquired Properties (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Net Assets Acquired [Table Text Block] | The Company determined that both of these acquisitions met the criteria of a business combination under Accounting Standards Codification (“ASC”) Topic 805, Business Combinations. The Company allocated the final adjusted purchase price to the acquired assets and liabilities based on fair value as of the respective acquisition dates, as summarized in the table below. Refer to Note 11 – Fair Value Measurements for additional discussion on the valuation techniques used in determining the fair value of acquired properties.
| Acquisition #1 |  | Acquisition #2
| As of September 24, 2014 |  | As of October 15, 2014
Purchase Price | (in thousands)
Cash consideration | $ | 321,807 |  |  | $ | 84,836 |
Fair value of assets and liabilities acquired: |  |  |
Proved oil and gas properties | $ | 203,467 |  |  | $ | 54,612 |
Unproved oil and gas properties | 126,588 |  |  | 29,610 |
Total fair value of oil and gas properties acquired | 330,055 |  |  | 84,222 |
Working capital | (6,135 | ) |  | 2,232 |
Asset retirement obligation | (2,113 | ) |  | (1,618 | )
Total fair value of net assets acquired | $ | 321,807 |  |  | $ | 84,836 |

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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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