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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2013
Asset Retirement Obligations | A reconciliation of our liability for plugging and abandonment costs for the years ended December 31, 2013 and 2012 is as follows (in thousands):
| 2013 |  |  | 2012 |
Beginning of period | $ | 146,478 |  |  | $ | 84,810 |
Liabilities incurred |  | 8,731 |  |  |  | 9,802 |
Liabilities settled |  | (424) |  |  |  | (3,649 | )
Disposition of wells |  | (3,129 | ) |  |  | (1,457 | )
Accretion expense |  | 10,778 |  |  |  | 8,793 |
Change in estimate |  | 67,643 |  |  |  | 48,179 |
End of period |  | 230,077 |  |  |  | 146,478 |
Less current portion |  | (5,037 | ) |  |  | (2,470 | )
Long-term asset retirement obligations | $ | 225,040 |  |  | $ | 144,008 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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