XML 49 R34.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
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, 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 |

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration