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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Activity Related to Asset Retirement Obligations | Activity related to the Company’s asset retirement obligations is as follows:
(In thousands) |  | Six Months Ended June 30, 2018
Balance at beginning of period(1) |  | $ | 48,553 |
Liabilities incurred |  | 2,322 |
Liabilities settled |  | (789 | )
Liabilities divested |  | (3,782 | )
Accretion expense |  | 1,223 |
Balance at end of period(2) |  | $ | 47,527 |
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(1) | Includes $5.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2017.
(2) | Includes $1.0 million of current asset retirement obligations included in accrued liabilities at June 30, 2018.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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