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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 13,270,235	$ 12,833,830	$ 12,627,329
Eastern [Member]
Segment Reporting Information [Line Items]
Assets	2,737,208		2,673,316
Southern [Member]
Segment Reporting Information [Line Items]
Assets	2,994,260		2,892,994
Western [Member]
Segment Reporting Information [Line Items]
Assets	1,697,050		1,596,129
Central [Member]
Segment Reporting Information [Line Items]
Assets	1,884,207		1,506,326
Canada [Member]
Segment Reporting Information [Line Items]
Assets	2,454,152		2,412,971
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Assets	962,761		969,808
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 540,597		$ 575,785

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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=119400593&loc=d3e572229-122910

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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.

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