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Suspended Exploratory Well Costs | 3 Months Ended
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Mar. 31, 2014
Suspended Exploratory Well Costs | (7) SUSPENDED EXPLORATORY WELL COSTS We capitalize exploratory well costs until a determination is made that the well has either found proved reserves or that it is impaired. Capitalized exploratory well costs are presented in natural gas and oil properties in the accompanying consolidated balance sheets. If an exploratory well is determined to be impaired, the well costs are charged to exploration expense in the accompanying consolidated statements of operations. The following table reflects the changes in capitalized exploratory well costs for the three months ended March 31, 2014 and the year ended December 31, 2013 (in thousands except for number of projects):
|  | March 31, 2014 |  |  | December 31, 2013 |
Balance at beginning of period |  | $ | 6,964 |  |  | $ | 57,360 |
Additions to capitalized exploratory well costs pending the determination of proved reserves |  |  | 5,552 |  |  |  | 39,832 |
Reclassifications to wells, facilities and equipment based on determination of proved reserves |  |  | — |  |  |  | (84,840 | )
Capitalized exploratory well costs charged to expense |  |  | — |  |  |  | — |
Divested wells |  |  | — |  |  |  | (5,388 | )
Balance at end of period |  |  | 12,516 |  |  |  | 6,964 |
Less exploratory well costs that have been capitalized for a period of one year or less |  |  | (5,552 | ) |  |  | — |
Capitalized exploratory well costs that have been capitalized for a period greater than one year |  | $ | 6,964 |  |  | $ | 6,964 |
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year |  |  | 1 |  |  |  | 1 |
As of March 31, 2014, $7.0 million of capitalized exploratory well costs have been capitalized for more than one year which relates to one well in our Marcellus Shale area where we are evaluating pipeline options. The following table provides an aging of capitalized exploratory well costs that have been suspended for more than one year as of March 31, 2014 (in thousands):
|  | Total |  |  | 2013 |  |  | 2012 |  |  | 2011 |
Capitalized exploratory well costs that have been capitalized for more than one year |  | $ | 6,964 |  |  | $ | 110 |  |  | $ | 6,801 |  |  | $ | 53 |

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- Definition The entire disclosure for parts or all of the information related to suspended well costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61939-109447 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration