XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Asset Retirement Obligations (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | A reconciliation of our liability for plugging and abandonment costs for the nine months ended September 30, 2017 is as follows (in thousands):
|  | Nine Months Ended September 30, 2017 |
Beginning of period |  | $ | 257,943 |
Liabilities incurred |  |  | 5,597 |
Liabilities settled |  |  | (6,125 | )
Disposition of wells |  |  | (2,427 | )
Accretion expense |  |  | 11,022 |
Change in estimate |  |  | 862 |
End of period |  |  | 266,872 |
Less current portion |  |  | (7,271 | )
Long-term asset retirement obligations |  | $ | 259,601 |

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 carrying amount of a liability for asset retirement obligations. + 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 + Details
Name: | us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration