Quarterly report pursuant to Section 13 or 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES (Details)

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CRUDE OIL AND NATURAL GAS PROPERTIES (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
a
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
a
Sep. 30, 2014
USD ($)
a
Dec. 31, 2014
USD ($)
a
Acquisitions [Abstract]          
Capital expenditures incurred but not yet paid     $ 93,000,000   $ 221,300,000
Mineral acres acquired, net | a     3,157 17,050  
Average acquisition cost per net acre $ 1,065 $ 1,586 $ 1,065 $ 1,586  
Unproved Properties [Abstract]          
Unproven leasehold interests | a 41,348   41,348   55,743
Anticipated future period over which excluded costs will become subject to depletion     5 years    
Impairment costs related to expired leases subject to depletion $ 1,100,000 $ 0 $ 32,400,000 $ 0