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Properties and Equipment (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Properties and Equipment |
Components of net properties and equipment |
|  | 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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of 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 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of aging of capitalized exploratory well costs |
|  | 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 Tabular disclosure of the change in capitalized exploratory costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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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 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 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 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 amount of exploratory well costs that have been capitalized after the completion of drilling and the number of projects for which those costs relate. Additionally, for exploratory well costs that have been capitalized for periods greater than one year at the most recent balance sheet date, this block of text may be used to disclose an aging of those amounts by year, or by using a range of years, and the number of projects to which those costs relate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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