XML 100 R49.htm IDEA: XBRL DOCUMENT v2.4.0.6
Concentration of Risk (Tables)
 12 Months Ended
Dec. 31, 2011
Concentration of Risk [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
The largest single non-affiliated purchasers of our production were as follows:
 
   
Percentage of
Crude Oil
Sales
  
Percentage of
Total Oil, Gas
 & NGL Sales
 
Year Ended December 31, 2011
      
Glencore Energy UK Ltd
  24%  16%
Shell  Trading (US) Company
  17%  12%
Year Ended December 31, 2010
        
Glencore Energy UK Ltd
  17%  11%
Year Ended December 31, 2009
        
Suncor Energy Marketing
  25%  16%