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Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Asset Retirement Obligations 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 |
The change in estimate during 2014 is attributable to an increase in cost of materials and services. The increase is primarily due to an increase in demand, more costly and rigorous plugging and abandonment techniques associated with the Company's wells in certain areas of its operations and the lack of availability of service providers in areas with minimal activity. As of both December 31, 2014 and 2013, approximately $2.0 million is included in accrued liabilities in the Consolidated Balance Sheet, which represents the current portion of the Company’s asset retirement obligation.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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