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Acquisition (Tables)
 6 Months Ended
Jun. 30, 2013
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
The following table summarizes the estimated acquisition date fair values of the net assets acquired (in thousands):
Oil and gas properties
 
$
188,778

Unevaluated oil and gas properties
 
19,036

Asset retirement obligations
 
(16,049
)
Net assets to be acquired
 
$
191,765