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) - USD ($)
$ in Thousands
Aug. 31, 2018
Feb. 13, 2017
Cimarex Energy Company    
Assets:    
Total 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  
Cimarex Energy Company | Evaluated properties    
Assets:    
Total oil and natural gas properties 253,089  
Cimarex Energy Company | Unevaluated properties    
Assets:    
Total oil and natural gas properties $ 287,000  
Delaware Basin    
Assets:    
Total oil and natural gas properties   $ 646,727
Total assets acquired   646,727
Liabilities:    
Asset retirement obligation   (168)
Total liabilities assumed   (168)
Net Assets Acquired   646,559
Delaware Basin | Evaluated properties    
Assets:    
Total oil and natural gas properties   137,368
Delaware Basin | Unevaluated properties    
Assets:    
Total oil and natural gas properties   $ 509,359