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Supplemental disclosures to the consolidated statements of cash flows
 6 Months Ended
Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental disclosures to the consolidated statements of cash flows
Supplemental disclosures to the consolidated statements of cash flows
Supplemental disclosures to the consolidated statements of cash flows are presented below:
 
 
Six months ended June 30,
 
 
2014
 
2013
Net cash provided by operating activities included:
 
 
 
 
Cash payments for interest
 
$
56,419

 
$
53,199

Interest capitalized
 
(6,290
)
 
(7,549
)
Cash payments for interest, net of amounts capitalized
 
$
50,129

 
$
45,650

Cash payments for income taxes
 
$
591

 
$
240

Non-cash investing activities included:
 
 
 
 
Asset retirement obligation additions
 
$
2,966

 
$
262

Oil and natural gas properties acquired through increase in accounts payable and accrued liabilities
 
$
20,768

 
$
19,613