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Oil and natural gas properties, net of accumulated impairment (under successful efforts accounting) (Tables)
 6 Months Ended
Jun. 30, 2016
Extractive Industries [Abstract]  
Components of Oil and Natural Gas Properties
Oil and natural gas properties are comprised of the following:
 
 
June 30,
2016
 
December 31, 2015
Proved property
$
9,695,367

 
$
9,940,660

Unproved property
$
1,375,940

 
$
1,375,940

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

 
$
11,316,600

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

 
$
3,033,279

Less: accumulated depletion
(2,112,224
)
 
(2,274,188
)
Oil and natural gas properties, net
$
675,762

 
$
759,091