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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2013
Business Combinations [Abstract] |
Purchase Price Allocation |
| Year Ended December 31, 2013
| West Williston |  | East Nesson
Consideration given to the sellers: | (In thousands)
Cash | $ | 1,496,369 |  |  | $ | 55,339 |
Forgiveness of debt | — |  |  | 1,896 |
Total consideration | 1,496,369 |  |  | 57,235 |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |
Assets acquired: |  |  |
Proved developed properties | 535,477 |  |  | 32,511 |
Proved undeveloped properties | 165,907 |  |  | 1,807 |
Unproved lease acquisition costs | 787,589 |  |  | 23,369 |
Other property and equipment | 13,157 |  |  | — |
Inventory | 3,181 |  |  | 148 |
Total assets acquired | 1,505,311 |  |  | 57,835 |
Liabilities assumed: |  |  |
Asset retirement obligations | 6,598 |  |  | 307 |
Revenues payable | 2,344 |  |  | 293 |
Total liabilities assumed | 8,942 |  |  | 600 |
Total identifiable net assets | $ | 1,496,369 |  |  | $ | 57,235 |
Business Acquisition, Pro Forma Information [Table Text Block] |
| Year Ended December 31,
| 2013 |  | 2012
| (In thousands)
| Unaudited
Revenues | $ | 1,297,545 |  |  | $ | 831,575 |
Net income | 231,217 |  |  | 136,004 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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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=6910749&loc=d3e4845-128472 + Details
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