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Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)
 3 Months Ended
Mar. 31, 2016
Extractive Industries [Abstract]  
Oil and natural gas properties
Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)

Oil and natural gas properties are comprised of the following:
 
 
March 31,
2016
 
December 31, 2015
Proved property
$
9,959,103

 
$
9,940,660

Unproved property
$
1,375,940

 
$
1,375,940

Total oil and natural gas properties, at cost
$
11,335,043

 
$
11,316,600

Less: accumulated impairment
$
(8,283,321
)
 
$
(8,283,321
)
Oil and natural gas properties, net of impairment
$
3,051,722

 
$
3,033,279

Less: accumulated depletion
(2,319,512
)
 
(2,274,188
)
Oil and natural gas properties, net
$
732,210

 
$
759,091


 
Depletion, depreciation, and amortization expense for the three months ended March 31, 2016 and 2015 was $48,019 and $75,199, respectively. During the three months ended March 31, 2016 and 2015, the Company recorded impairment losses of $0 and $5,496, respectively.