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) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
acre
PlannedWells
Dec. 31, 2013
acre
Acquisitions [Abstract]    
Capital expenditures incurred but not yet paid $ 211,200,000 $ 163,000,000
Mineral acres acquired, net (in acres) 17,050  
Average acquisition cost per net acre 1,586  
Productive oil and gas wells, Number of wells, Gross 123  
Productive oil and gas wells, Number of wells, Net 10.0  
Productive Oil and Gas Wells, Cost $ 10,300,000  
Unproved Properties [Abstract]    
Unproven leasehold interests (in net acres) 57,500 60,600
Anticipated future period over which excluded costs will become subject to depletion 5 years