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Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
ASSETS
Segment assets for total reportable business segments	$ 8,207,758	$ 6,931,913	$ 9,025,195
Items excluded from segment assets:
Recoverable Income Taxes	27,780	31,523
Total Consolidated Assets	8,207,758	$ 6,931,913	9,025,195
Intersegment Eliminations [Member]
ASSETS
Segment assets for total reportable business segments	(11,166)		0
Items excluded from segment assets:
Total Consolidated Assets	(11,166)		0
Segment Reconciling Items [Member]
Items excluded from segment assets:
Cash and Cash Equivalents	54,846		291,535
Recoverable Income Taxes	27,780		112,073
Deferred Income Taxes	0		0
Assets Held for Sale	250,746		0
Discontinued Operations	0		2,426,767
E&P [Member] | Operating Segments [Member]
ASSETS
Segment assets for total reportable business segments	6,055,545		6,194,820
Items excluded from segment assets:
Total Consolidated Assets	6,055,545		6,194,820
Midstream [Member] | Operating Segments [Member]
ASSETS
Segment assets for total reportable business segments	1,830,007		0
Items excluded from segment assets:
Total Consolidated Assets	$ 1,830,007		$ 0

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