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Segment Information Reconciliation of Segment Information, Total Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Items Excluded from Segment Assets:
Segment Assets	$ 9,060,806	$ 8,592,170	$ 6,931,913
Recoverable Income Taxes	62,425	149,481
Intercompany Eliminations
Items Excluded from Segment Assets:
Segment Assets	6,331	(12,223)
Segment Reconciling Items
Items Excluded from Segment Assets:
Cash and Cash Equivalents	16,283	17,198
Recoverable Income Taxes	62,425	149,481
Exploration and Production Equipment | Operating Segments
Items Excluded from Segment Assets:
Segment Assets	6,745,091	6,518,597	$ 6,391,223
Midstream | Operating Segments
Items Excluded from Segment Assets:
Segment Assets	$ 2,230,676	$ 1,919,117

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Segment Reporting Information, Other Items Not Allocated to Segments [Abstract]

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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.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Sum of investments and unrestricted cash as of the balance sheet date.

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