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Supplemental disclosures to the consolidated statements of cash flows (Tables)
 3 Months Ended
Mar. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental disclosures to the consolidated statements of cash flows
Supplemental disclosures to the consolidated statements of cash flows are presented below:
 
 
Three months ended March 31,
 
 
2014
 
2013
Net cash provided by operating activities included:
 
 
 
 
Cash payments for interest
 
$
18,794

 
$
16,787

Interest capitalized
 
(2,942
)
 
(3,628
)
Cash payments for interest, net of amounts capitalized
 
$
15,852

 
$
13,159

Non-cash investing activities included:
 
 
 
 
Asset retirement obligation additions and revisions
 
$
139

 
$
76

Oil and natural gas properties acquired through increase in accounts payable and accrued liabilities
 
$
18,629

 
$
18,502