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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2013
Property Plant And Equipment [Abstract] |
Property, Plant and Equipment | 4. Property, Plant and Equipment The following table sets forth the Company’s property, plant and equipment:
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | (In thousands) |
Proved oil and gas properties (1) |  | $ | 2,418,598 |  |  | $ | 2,271,711 |
Less: Accumulated depreciation, depletion, amortization and impairment |  |  | (433,371 | ) |  |  | (383,564 | )
Proved oil and gas properties, net |  |  | 1,985,227 |  |  |  | 1,888,147 |
Unproved oil and gas properties |  |  | 68,600 |  |  |  | 76,417 |
Total oil and gas properties, net |  |  | 2,053,827 |  |  |  | 1,964,564 |
Other property and equipment |  |  | 136,676 |  |  |  | 49,732 |
Less: Accumulated depreciation |  |  | (13,295 | ) |  |  | (7,696 | )
Other property and equipment, net |  |  | 123,381 |  |  |  | 42,036 |
Total property, plant and equipment, net |  | $ | 2,177,208 |  |  | $ | 2,006,600 |
(1) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $22.5 million and $20.7 million at March 31, 2013 and December 31, 2012, respectively.
As a result of expiring leases and periodic assessments of unproved properties, the Company recorded non-cash impairment charges on its unproved oil and gas properties of $0.5 million and $0.4 million for the three months ended March 31, 2013 and 2012, respectively. No impairment charges on proved oil and natural gas properties were recorded for the three months ended March 31, 2013 or 2012.

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- Definition The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 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 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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