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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Activity related to the Company's asset retirement obligations is as follows:
(In thousands) | Year Ended December 31, 2014
Balance at beginning of period | $ | 75,853 |
Liabilities incurred | 7,220 |
Liabilities settled and divested | (1,474 | )
Liabilities acquired | 1,206 |
Accretion expense | 5,110 |
Change in estimate | 38,740 |
Balance at end of period | $ | 126,655 |

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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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