Acquisitions and Divestitures of Oil and Natural Gas Properties - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Double Eagle Acquisition [Member] $ in Thousands	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Cash	$ 2,469
Receivables	17,060
Derivatives	3,970
Proved oil and natural gas properties	353,000
Unproved oil and natural gas properties	2,247,607
Total assets acquired	2,624,106
Accounts payable	(39,355)
Deferred tax liability	(6,618)
Total liabilities assumed	(45,973)
Estimated fair value of net assets acquired	$ 2,578,133

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Amount of assets acquired at the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

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