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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 Obligations | Activity related to the Company's asset retirement obligations is as follows:
(In thousands) |  | Year Ended December 31, 2016
Balance at beginning of period |  | $ | 145,606 |
Liabilities incurred |  | 3,522 |
Liabilities settled |  | (1,148 | )
Liabilities divested |  | (24,338 | )
Accretion expense |  | 8,065 |
Change in estimate |  | 2,026 |
Balance at end of period |  | $ | 133,733 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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