Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures (Fair Value of Net Assets Acquired ) (Details)

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Acquisitions and Divestitures (Fair Value of Net Assets Acquired ) (Details) - Cimarex Energy Company
$ in Thousands
Aug. 31, 2018
USD ($)
Assets:  
Oil and natural gas properties $ 540,089
Total assets acquired 540,089
Liabilities:  
Asset retirement obligation (570)
Total liabilities assumed (570)
Net Assets Acquired 539,519
Evaluated properties  
Assets:  
Oil and natural gas properties 253,089
Unevaluated properties  
Assets:  
Oil and natural gas properties $ 287,000