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Oil and Natural Gas Properties
 6 Months Ended
Jun. 30, 2014
Oil and Natural Gas Properties [Abstract]  
Oil and natural gas properties
Oil and Natural Gas Properties
Oil and Natural Gas Capitalized Costs
Aggregate capitalized costs related to oil, natural gas and NGL production activities with applicable accumulated depletion and amortization are presented below:
 
June 30, 2014
 
December 31, 2013
 
(in thousands)
Oil and natural gas:
 
 
 
Proved properties
$
3,755,393

 
$
3,397,785

Unproved properties
1,370,732

 
1,415,874

 
5,126,125

 
4,813,659

Less accumulated depletion and amortization
(150,631
)
 
(10,394
)
 
$
4,975,494

 
$
4,803,265