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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 11,469,432	$ 11,103,925
Southern [Member]
Segment Reporting Information [Line Items]
Assets	2,813,993	2,869,841
Western [Member]
Segment Reporting Information [Line Items]
Assets	1,502,583	1,516,870
Eastern [Member]
Segment Reporting Information [Line Items]
Assets	1,941,755	1,541,854
Canada [Member]
Segment Reporting Information [Line Items]
Assets	2,533,253	2,532,046
Central [Member]
Segment Reporting Information [Line Items]
Assets	1,296,480	1,302,900
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Assets	985,634	1,068,086
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 395,734	$ 272,328

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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