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Equity Distributions Earned (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended
Apr. 25, 2014
Jan. 24, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Distributions Earned by Limited or General Partners [Line Items]            
Distribution Made To Partners, Total Cash Distributions Declared $ 10,474 $ 10,228 $ 11,910 $ 9,688 $ 22,384 $ 19,117
Cash distributions per unit     $ 0.475 $ 0.395 [1] $ 0.900 $ 0.780 [1]
General Partner [Member]
            
Distributions Earned by Limited or General Partners [Line Items]            
Managing Member Or General Partner, Subsequent Distribution Amount, Excluding Incentive Distribution     235 193 444 382
Incentive Distribution, Subsequent Distribution Amount     189 0 189 0
Managing Member or General Partner, Subsequent Distribution Amount     424 193 633 382
Limited Partner [Member]
            
Distributions Earned by Limited or General Partners [Line Items]            
Limited partners' distribution     11,486 9,495 21,751 18,735
Common Units [Member] | Limited Partner [Member]
            
Distributions Earned by Limited or General Partners [Line Items]            
Limited partners' distribution     5,787 4,755 10,952 9,375
Subordinated Units [Member] | Limited Partner [Member]
            
Distributions Earned by Limited or General Partners [Line Items]            
Limited partners' distribution     $ 5,699 $ 4,740 $ 10,799 $ 9,360
[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.