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Divestitures and Assets Held for Sale Fair Value of Acquired Properties (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Net Assets Acquired [Table Text Block]
 
As of September 24, 2014
 
As of October 15, 2014
Purchase Price
(in thousands)
Cash consideration
$
325,230

 
$
84,836

 
 
 
 
Fair value of assets acquired:
 
 
 
Proved oil and gas properties
$
203,493

 
$
54,360

Unproved oil and gas properties
126,622

 
29,469

Total fair value of oil and gas properties acquired
330,115

 
83,829

 
 
 
 
Working capital
(2,772
)
 
2,625

Asset retirement obligation
(2,113
)
 
(1,618
)
Total fair value of net assets acquired
$
325,230

 
$
84,836