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Supplemental Disclosures to the Consolidated Statements of Cash Flows
9 Months Ended
Sep. 30, 2012
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:
 
 
Nine months ended September 30,
 
 
2012
 
2011
Net cash provided by operating activities included:
 
 
 
 
Cash payments for interest
 
$
71,475

 
$
72,366

Interest capitalized
 
(3,311
)
 
(1,835
)
Cash payments for interest, net of amounts capitalized
 
$
68,164

 
$
70,531

Cash (receipts) payments for income taxes
 
$
100

 
$
101

Non-cash investing activities included:
 
 
 
 
Asset retirement costs capitalized
 
$
551

 
$
396

Oil and natural gas properties acquired through increase (decrease) in accounts payable and accrued liabilities
 
$
38,184

 
$
10,301