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Supplementary information
 9 Months Ended
Sep. 30, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Supplementary information
Supplementary information
Costs incurred in oil and natural gas property acquisition, exploration and development activities
Costs incurred in the acquisition, exploration and development of oil and natural gas assets are presented below for the periods presented:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(in thousands)
 
2015
 
2014
 
2015
 
2014
Property acquisition costs:
 
 

 
 

 
 

 
—

Evaluated
 
$
—

 
$
—

 
$
—

 
$
3,873

Unevaluated
 
—


—

 
—

 
9,925

Exploration(1)
 
7,803


200,711

 
16,157

 
217,353

Development costs(2)
 
64,451


325,118

 
381,641

 
733,671

Total costs incurred
 
$
72,254


$
525,829

 
$
397,798

 
$
964,822

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(1)
The Company acquired significant leasehold interests during the three months ended September 30, 2014.
(2)
The costs incurred for oil and natural gas development activities include $0.3 million and $1.6 million in asset retirement obligations for the three months ended September 30, 2015 and 2014, respectively, and $1.3 million and $3.1 million for the nine months ended September 30, 2015 and 2014, respectively.