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Property, Plant and Equipment | 6 Months Ended
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Jun. 30, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The following table sets forth the Company’s property, plant and equipment:
| June 30, 2015 |  | December 31, 2014
| (In thousands)
Proved oil and gas properties(1) | $ | 5,589,637 |  |  | $ | 5,156,875 |
Less: Accumulated depreciation, depletion, amortization and impairment | (1,273,361 | ) |  | (1,043,121 | )
Proved oil and gas properties, net | 4,316,276 |  |  | 4,113,754 |
Unproved oil and gas properties | 689,089 |  |  | 809,265 |
Total oil and gas properties, net | 5,005,365 |  |  | 4,923,019 |
Other property and equipment | 416,417 |  |  | 313,439 |
Less: Accumulated depreciation | (65,125 | ) |  | (49,672 | )
Other property and equipment, net | 351,292 |  |  | 263,767 |
Total property, plant and equipment, net | $ | 5,356,657 |  |  | $ | 5,186,786 |
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(1) | Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $38.2 million and $36.9 million at June 30, 2015 and December 31, 2014, respectively.
Impairment. As a result of expiring leases and periodic assessments of unproved properties, the Company recorded non-cash impairment charges on its unproved oil and natural gas properties of $19.5 million and $24.8 million for the three and six months ended June 30, 2015, respectively, and $42,000 and $0.8 million for the three and six months ended June 30, 2014, respectively. The impairment charges for the three and six months ended June 30, 2015 included $19.1 million and $20.3 million, respectively, related to acreage expiring within the next 12 months because there were no current plans to drill or extend the leases prior to their expiration. For the three and six months ended June 30, 2014, the Company did not record similar impairment charges based on its ability to actively manage and prioritize its capital expenditures to drill leases and to make payments to extend leases that would have otherwise expired. No impairment charges on proved oil and gas properties were recorded for the three and six months ended June 30, 2015 or 2014. Divestiture. On March 5, 2014, the Company completed the sale of certain non-operated properties in and around its Sanish position for cash proceeds of approximately $324.9 million, which includes customary post close adjustments. The Company recognized a $187.0 million gain on sale of properties in its Consolidated Statement of Operations for the year ended December 31, 2014.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, 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 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 2: 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=51717284&loc=d3e1361-107760 Reference 3: 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=51719941&loc=d3e2921-110230 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 + Details
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