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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 12,192,066 | $ 12,014,681
Southern [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,778,123 | 2,718,296
Western [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,583,561 | 1,573,955
Eastern [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,348,438 | 2,024,527
Canada [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 2,562,659 | 2,677,557
Central [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,452,607 | 1,297,118
Exploration and Production [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 974,049 | 981,980
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 492,629 | $ 741,248

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- 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 + Details
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