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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | The following is a reconciliation of our liability for plugging and abandonment costs as of December 31, 2016 and 2015 (in thousands):
| 2016 |  |  | 2015 |
Beginning of period | $ | 264,137 |  |  | $ | 287,463 |
Liabilities incurred |  | 2,694 |  |  |  | 4,595 |
Acquisitions |  | 21,900 |  |  |  | 1,584 |
Liabilities settled |  | (11,511 | ) |  |  | (18,828 | )
Disposition of wells |  | (10,540 | ) |  |  | (45,845 | )
Accretion expense |  | 18,021 |  |  |  | 19,163 |
Change in estimate |  | (26,758 | ) |  |  | 16,005 |
End of period |  | 257,943 |  |  |  | 264,137 |
Less current portion |  | (7,271 | ) |  |  | (15,071 | )
Long-term asset retirement obligations | $ | 250,672 |  |  | $ | 249,066 |

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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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