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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
A summary of our goodwill accounts is as follows (in thousands):

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

Goodwill impairment
 
—

Balance,
December 31, 2013
 
$
10,454