Disclosure of Major Customers

12 Months Ended

Dec. 31, 2012

Disclosure of Major Customers

Disclosure of Major Customers

16. Disclosure of Major Customers

For the years ended December 31, 2012, 2011 and 2010, there were four customers who accounted for more than 10% of revenues:

	2012		2011			2010
Sunoco, Inc.	$	34,147,610	$	22,579,414		$	10,951,458
Valero Marketing & Supply Co.	22,321,999		—		(1)	—		(1)
DCP Midstream, LP	15,412,128		31,727,341			23,224,023
Shell Trading (U.S.) Company	11,692,738		—		(1)	—		(1)

(1) Customer represented less than 10% of revenues for the years ended December 31, 2011 and 2010.

Each of our major customers represents a significant percentage of total revenue.  Contracts with our major customers are short-term or evergreen contracts based on prevailing commodity market prices at the time of delivery.  A change in one or all of our major customers, whether initiated by the customer or by us, is unlikely to have a significant interruption in production or revenue.