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Equity and Distributions, Distributions (Details) (USD $)
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Cash Distribution [Member]
First Quarter 2014 Distribution [Member]
Jun. 30, 2014
Cash Distribution [Member]
First Quarter 2014 Distribution [Member]
Jun. 30, 2014
Cash Distribution [Member]
Second Quarter 2014 Distribution [Member]
Jun. 30, 2014
Cash Distribution [Member]
Second Quarter 2014 Distribution [Member]
Mar. 31, 2013
Cash Distribution [Member]
First Quarter 2013 Distribution [Member]
Jun. 30, 2014
Cash Distribution [Member]
First Quarter 2013 Distribution [Member]
Jun. 30, 2013
Cash Distribution [Member]
Second Quarter 2013 Distribution [Member]
Jun. 30, 2014
Cash Distribution [Member]
Second Quarter 2013 Distribution [Member]
Distributions to Partners [Abstract]                  
Distribution Per Common Unit (in dollars per unit)   $ 0.7100   $ 0.7200   $ 0.6700   $ 0.6800  
Record Date     Apr. 30, 2014   Jul. 31, 2014   Apr. 30, 2013   Jul. 31, 2013
Payment Date     May 07, 2014   Aug. 07, 2014   May 07, 2013   Aug. 07, 2013
Number of Designated Units to be excluded from distributions during 2014 22,560,000                
Number of Designated Units to be excluded from distributions during 2015 17,690,000