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 $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
acre
PlannedWells
Jun. 30, 2013
acre
Dec. 31, 2013
acre
Acquisitions [Abstract]      
Capital expenditures incurred but not yet paid $ 205,000,000   $ 163,000,000
Mineral acres acquired, net (in acres) 11,681 10,497  
Average acquisition cost per net acre 1,671 1,075  
Productive oil and gas wells, Number of wells, Gross 74    
Productive oil and gas wells, Number of wells, Net 6.2    
Productive Oil and Gas Wells, Cost $ 6,600,000    
Unproved Properties [Abstract]      
Unproven leasehold interests (in net acres) 59,000   60,600
Anticipated future period over which excluded costs will become subject to depletion 5 years