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Equity Cash distributions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Apr. 25, 2014
Jan. 24, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 28, 2014
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]              
Total Quarterly Distribution Per Unit $ 0.425 $ 0.415         $ 0.475
Total Quarterly Distribution Per Unit, Annualized $ 1.70 $ 1.66         $ 1.90
Total Cash Distribution including general partner IDRs $ 10,474 $ 10,228 $ 11,910 $ 9,688 $ 22,384 $ 19,117 $ 11,910