Acquisitions and Dispositions (Fair Value of Net Assets Acquired ) (Details) - Cimarex Energy Company $ in Thousands	Aug. 31, 2018 USD ($)
Business Acquisition [Line Items]
Asset retirement obligations	$ (570)
Net assets acquired	539,519
Evaluated oil and natural gas properties
Business Acquisition [Line Items]
Oil and natural gas properties	253,089
Unevaluated oil and natural gas properties
Business Acquisition [Line Items]
Oil and natural gas properties	$ 287,000

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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