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ACQUISITION AND DISPOSITION OF PROPERTIES - Additional Information (Details)
a in Thousands, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
a
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
MBoe
Business Acquisition [Line Items]          
Payments to acquire unproved leasehold properties     $ 143.7 $ 85.7 $ 68.5
San Juan Basin properties          
Business Acquisition [Line Items]          
Cash received from sale of oil properties $ 384.0        
Purchase price adjustments 11.0        
Transaction costs 2.8        
Pre-tax gain on disposal 27.0        
Sale of assets $ 395.0        
Proved reserves (in mboe) | MBoe         69,038
Payments to acquire unproved leasehold properties   $ 22.8      
Net acres | a   15      
Lea County          
Business Acquisition [Line Items]          
Payments to acquire unproved leasehold properties     77.0    
Disposal Group, Not Discontinued Operations | Permian and San Juan Basin          
Business Acquisition [Line Items]          
Disposal group, consideration     552.0    
Disposal Group, Held-for-sale, Not Discontinued Operations | Permian and San Juan Basin          
Business Acquisition [Line Items]          
Cash received from sale of oil properties     532.9    
Purchase price adjustments     19.0    
Transaction costs     5.0    
Pre-tax gain on disposal     $ 246.3