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Acquisition and Dispositions of Properties - Additional Information (Details)
a in Thousands, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2014
USD ($)
a
Mar. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
MBoe
Gas and Oil Acreage [Line Items]        
Payment for unproved leasehold     $ 61.1 $ 68.5
San Juan        
Gas and Oil Acreage [Line Items]        
Payment for unproved leasehold $ 22.8      
Acres of unproved leasehold, net | a 15      
San Juan Basin        
Gas and Oil Acreage [Line Items]        
Amount of consideration received   $ 395.0    
Purchase price adjustments   16.0    
Pre-tax proceeds   378.0    
Transaction costs   2.8    
Proved developed reserves (MBOE) | MBoe       69,038
San Juan Basin | San Juan        
Gas and Oil Acreage [Line Items]        
Pre-tax gain on disposal   $ 27.1