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Acquisitions of Oil and Natural Gas Properties (Tables)
 12 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
The following table summarizes the estimated fair value of the assets acquired and liabilities assumed as a result of the Double Eagle Acquisition (in thousands):
Cash
$
2,469

Receivables
20,756

Derivatives
3,970

Proved oil and natural gas properties
353,000

Unproved oil and natural gas properties
2,257,266

Total assets acquired
2,637,461

Accounts payable
(48,179
)
Deferred tax liability
(10,167
)
Total liabilities assumed
(58,346
)
Estimated fair value of net assets acquired
$
2,579,115