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Equity Distributions Earned (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Distributions Earned by Limited or General Partners [Line Items]    
General partner's interest $ 209 $ 189
Limited partners' distribution 10,474 9,429
Cash distributions per unit $ 0.425 $ 0.385 [1]
Common
    
Distributions Earned by Limited or General Partners [Line Items]    
Limited partners' distribution 5,165 4,620
Subordinated
    
Distributions Earned by Limited or General Partners [Line Items]    
Limited partners' distribution 5,100 4,620
General Partner [Member]
    
Distributions Earned by Limited or General Partners [Line Items]    
General partner's interest $ 209 $ 189
[1] Adjusted to include the historical results of the El Dorado Terminal and Tank Assets and the Tyler Terminal and Tank Assets. See Notes 1 and 2 for further discussion.