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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]      
Beginning balance $ 10,454 [1] $ 7,499 $ 7,499
Goodwill Impairment 0 0 0
Goodwill acquired through the business combinations of Nettleton and Big Sandy   2,955  
Ending balance $ 10,454 $ 10,454 [1] $ 7,499
[1] Includes the historical balances of the Tyler Terminal and Tank Assets. See Notes 1 and 3 for further discussion.