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Properties and Equipment, Net (Tables) | 6 Months Ended
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Jun. 30, 2015
Property, Plant and Equipment [Abstract] |
Schedule of properties and equipment, net | Properties and equipment, net are comprised of the following:
(In thousands) |  | June 30, 2015 |  | December 31, 2014
Proved oil and gas properties |  | $ | 8,531,171 |  |  | $ | 7,984,979 |
Unproved oil and gas properties |  | 451,332 |  |  | 492,208 |
Gathering and pipeline systems |  | 242,371 |  |  | 241,272 |
Land, building and other equipment |  | 114,809 |  |  | 109,758 |
|  | 9,339,683 |  |  | 8,828,217 |
Accumulated depreciation, depletion and amortization |  | (4,207,028 | ) |  | (3,902,506 | )
|  | $ | 5,132,655 |  |  | $ | 4,925,711 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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