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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2015 |  | 2014
Oil and natural gas properties |  |  |
Proved(1) | $ | 12,529,681 |  |  | $ | 11,707,147 |
Unproved | 363,149 |  |  | 290,596 |
Total oil and natural gas properties | 12,892,830 |  |  | 11,997,743 |
Less accumulated depreciation, depletion and impairment | (11,149,888 | ) |  | (6,359,149 | )
Net oil and natural gas properties capitalized costs | 1,742,942 |  |  | 5,638,594 |
Land | 14,260 |  |  | 16,300 |
Non-oil and natural gas equipment(2) | 373,687 |  |  | 602,392 |
Buildings and structures(3) | 227,673 |  |  | 263,191 |
Total | 615,620 |  |  | 881,883 |
Less accumulated depreciation and amortization | (123,860 | ) |  | (305,420 | )
Other property, plant and equipment, net | 491,760 |  |  | 576,463 |
Total property, plant and equipment, net | $ | 2,234,702 |  |  | $ | 6,215,057 |
____________________
(1) | Includes cumulative capitalized interest of approximately $48.9 million and $38.1 million at December 31, 2015 and 2014, respectively.
(2) | Includes cumulative capitalized interest of approximately $4.3 million at both December 31, 2015 and 2014.
(3) | Includes cumulative capitalized interest of approximately $20.4 million and $17.1 million at December 31, 2015 and 2014, respectively.
Capitalized Costs of Unproved Properties Excluded from Amortization | The following table summarizes the costs, by year incurred, related to unproved properties and pipe inventory, which were excluded from oil and natural gas properties subject to amortization at December 31, 2015 (in thousands):
|  |  | Year Cost Incurred
| Total |  | 2015 |  | 2014 |  | 2013 |  | 2012 and Prior
Property acquisition | $ | 362,803 |  |  | $ | 197,849 |  |  | $ | 70,304 |  |  | $ | 14,011 |  |  | $ | 80,639 |
Exploration(1) | 34,988 |  |  | 10,698 |  |  | 6,263 |  |  | 17,688 |  |  | 339 |
Total costs incurred | $ | 397,791 |  |  | $ | 208,547 |  |  | $ | 76,567 |  |  | $ | 31,699 |  |  | $ | 80,978 |
____________________
(1) | Includes $34.7 million of pipe inventory costs incurred ($10.5 million in 2015, $6.2 million in 2014 and $18.0 million in 2013 and prior years).

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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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- Definition Tabular disclosure of the capitalized costs of unproved properties and major development projects that are excluded from capitalized costs being amortized. This includes the total costs excluded and, at a minimum, these categories of costs: acquisition costs, exploration costs, development costs in the case of significant development projects, and capitalized interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
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