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Acquisitions and Divestitures - Allocation of Purchase Price (Details) - Williston Basin Acquisition $ in Thousands	Dec. 01, 2016 USD ($)
Business Combination, Consideration Transferred [Abstract]
Cash	$ 764,300
Assets acquired:
Proved developed properties	419,911
Proved undeveloped properties	154,146
Unproved lease acquisition costs	200,244
Other property and equipment	204
Inventory	1,297
Liabilities assumed:
Asset retirement obligations	(8,931)
Revenues payable	(2,571)
Total identifiable net assets	$ 764,300

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Property and Equipment

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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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The amount of inventory recognized as of 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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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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