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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations Activity related to the Company's asset retirement obligations is as follows:
(In thousands) |  | Year Ended December 31, 2017
Balance at beginning of period (1) |  | $ | 133,733 |
Liabilities incurred |  | 4,653 |
Liabilities settled |  | (1,293 | )
Liabilities divested |  | (77,965 | )
Liabilities transferred to liabilities held for sale |  | (15,748 | )
Accretion expense |  | 5,173 |
Balance at end of period (2) |  | $ | 48,553 |
____________________________________________ (1) Includes $2.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2016. (2) Includes $5.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2017.

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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 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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