Concentration of Risk Concentration of Risk (Tables)
12 Months Ended
Dec. 31, 2013
Concentration Risk - Revenue  
Individual Customers Constituting 10% or more of Total Revenue [Table Text Block]
Major Customers. The following table presents the individual customers from continuing operations constituting 10% or more of total revenues:
 
 
Year ended December 31,
Major Customer
 
2013
 
2012
Suncor Energy Marketing, Inc.
 
70%
 
71%
DCP Midstream, LP
 
30%
 
29%