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Properties and Equipment | 12 Months Ended
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Dec. 31, 2013
Properties and Equipment |
Properties and Equipment | 3. Properties and Equipment Properties and equipment are comprised of the following:
|  | December 31, |
--- | --- | --- | ---
(In thousands) |  | 2013 |  | 2012 |
Proved oil and gas properties |  | $ | 6,362,570 |  | $ | 5,724,940 |
Unproved oil and gas properties |  |  | 375,428 |  |  | 467,483 |
Gathering and pipeline systems |  |  | 239,958 |  |  | 239,656 |
Land, building and other equipment |  |  | 94,243 |  |  | 86,137 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 7,072,199 |  |  | 6,518,216 |
Accumulated depreciation, depletion and amortization |  |  | (2,525,972 | ) |  | (2,207,239 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 4,546,227 |  | $ | 4,310,977 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Capitalized Exploratory Well Costs The following table reflects the net changes in capitalized exploratory well costs:
|  | Year Ended December 31, |
--- | --- | --- | ---
(In thousands) |  | 2013 |  | 2012 |  | 2011 |
Balance at beginning of period |  | $ | 10,390 |  | $ | 5,328 |  | $ | 4,285 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  |  | — |  |  | 10,390 |  |  | 5,328 |
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves |  |  | (10,198 | ) |  | — |  |  | (1,138 | )
Capitalized exploratory well costs charged to expense |  |  | (192 | ) |  | (5,328 | ) |  | (3,147 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at end of period |  | $ | — |  | $ | 10,390 |  | $ | 5,328 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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The following table provides an aging of capitalized exploratory well costs based on the date the drilling was completed:
|  | December 31, |
--- | --- | --- | ---
(In thousands) |  | 2013 |  | 2012 |  | 2011 |
Capitalized exploratory well costs that have been capitalized for a period of one year or less |  | $ | — |  | $ | 10,390 |  | $ | 5,328 |
Capitalized exploratory well costs that have been capitalized for a period greater than one year |  |  | — |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | — |  | $ | 10,390 |  | $ | 5,328 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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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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