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Goodwill (Tables)
12 Months Ended
Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
A summary of our goodwill accounts is as follows (in thousands):

Balance,
December 31, 2009
 
$
7,499

Goodwill impairment
 

Balance,
December 31, 2010
 
7,499

Goodwill impairment
 

Balance,
December 31, 2011
 
7,499

Goodwill impairment
 

Goodwill acquired through the business combinations of Nettleton and Big Sandy
 
2,955

Balance,
December 31, 2012
 
$
10,454