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Significant Concentrations
 12 Months Ended
Dec. 31, 2011
Significant Concentrations [Abstract]  
Significant Concentrations

13. Significant Concentrations

Purchasers that accounted for more than 10% of the Company's total sales for the periods presented are as follows:

 

September 30, September 30, September 30,
       Year Ended December 31,
       2011   2010   2009

Texon L.P.

      18%   19%   30%

Plains All American Pipeline L.P.

      16%   28%   N/A

Enserco Energy Inc.

      15%   N/A   N/A

Whiting Petroleum Corporation

      N/A   11%   N/A

Tesoro Refining and Marketing Company

      N/A   N/A   32%

N/A

Not applicable as the sales to these purchasers did not account for more than 10% of the Company's total sales for such respective periods.

No other purchasers accounted for more than 10% of the Company's total oil and natural gas sales for the years ended December 31, 2011, 2010 and 2009. Management believes that the loss of any of these purchasers would not have a material adverse effect on the Company's operations, as there are a number of alternative oil and natural gas purchasers in the Company's producing regions.

Substantially all of the Company's accounts receivable result from sales of oil and natural gas as well as joint interest billings ("JIB") to third-party companies who have working interest payment obligations in projects completed by the Company. Northern Oil & Gas Inc. and Hess Corporation accounted for approximately 16% and 14%, respectively, of the Company's JIB receivables balance at December 31, 2011. Brigham Oil & Gas LP and Hess Corporation accounted for approximately 44% and 12%, respectively, of the Company's JIB receivables balance at December 31, 2010.

This concentration of customers and joint interest owners may impact the Company's overall credit risk, either positively or negatively, in that these entities may be similarly affected by changes in economic or other conditions.