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Properties and Equipment, Net | 3 Months Ended
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Mar. 31, 2014
Properties and Equipment, Net |
Properties and Equipment, Net | 2. Properties and Equipment, Net Properties and equipment, net are comprised of the following:
|  | March 31, |  | December 31, |
(In thousands) |  | 2014 |  | 2013 |
Proved oil and gas properties |  | $ | 6,676,002 |  | $ | 6,362,570 |
Unproved oil and gas properties |  | 365,186 |  | 375,428 |
Gathering and pipeline systems |  | 239,925 |  | 239,958 |
Land, building and other equipment |  | 97,082 |  | 94,243 |
|  | 7,378,195 |  | 7,072,199 |
Accumulated depreciation, depletion and amortization |  | (2,667,626 | ) | (2,525,972 | )
|  | $ | 4,710,569 |  | $ | 4,546,227 |
At March 31, 2014, the Company did not have any projects that had exploratory well costs that were capitalized for a period of greater than one year after drilling.

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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 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 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: 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 4: 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 + Details
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