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Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)
 9 Months Ended
Sep. 30, 2017
Extractive Industries [Abstract]  
Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)
Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting)

Oil and natural gas properties are comprised of the following: 
 
September 30,
2017
 
December 31, 2016
Proved property
$
9,695,367

 
$
9,695,367

Unproved property
$
1,375,940

 
$
1,375,940

Total oil and natural gas properties, at cost
$
11,071,307

 
$
11,071,307

Less: accumulated impairment
$
(8,283,321
)
 
$
(8,283,321
)
Oil and natural gas properties, net of impairment
$
2,787,986

 
$
2,787,986

Less: accumulated depletion
(2,234,098
)
 
(2,166,643
)
Oil and natural gas properties, net
$
553,888

 
$
621,343


 
Depletion and accretion expense for the three months ended September 30, 2017 and 2016 was $28,455 and $31,114, respectively, and $76,573 and $104,168 for the nine months ended September 30, 2017 and 2016, respectively. During the three and nine months ended September 30, 2017 and 2016, the Company recorded no impairment losses.