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Acquisitions Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2014
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

 
 
(in thousands)
Consideration paid
 
 
     Cash, net of purchase price adjustments
 
$
179,527

Fair value of identifiable assets acquired
 
 
     Oil and natural gas properties
 
 
       Proved
 
$
31,961

       Unproved
 
6,263

       Unevaluated
 
141,303

Fair value of net identifiable assets acquired
 
$
179,527