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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2013
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | The following table sets forth the Company’s property, plant and equipment:
| December 31,
| 2013 |  | 2012
| (In thousands)
Proved oil and gas properties(1) | $ | 3,713,525 |  |  | $ | 2,271,711 |
Less: Accumulated depreciation, depletion, amortization and impairment | (612,380 | ) |  | (383,564 | )
Proved oil and gas properties, net(2) | 3,101,145 |  |  | 1,888,147 |
Unproved oil and gas properties | 815,433 |  |  | 76,417 |
Other property and equipment | 188,468 |  |  | 49,732 |
Less: Accumulated depreciation | (25,296 | ) |  | (7,696 | )
Other property and equipment, net(2) | 163,172 |  |  | 42,036 |
Total property, plant and equipment, net | $ | 4,079,750 |  |  | $ | 2,006,600 |
(1) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $32.6 million and $20.7 million at December 31, 2013 and 2012, respectively.
(2) | The Company reclassed substantially all of its salt water disposal and other midstream assets from proved oil and gas properties to other property and equipment, effective January 1, 2013.

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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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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 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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