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Equity and Distributions, Distributions (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Distributions to Partners [Abstract]    
Number of Designated Units to be excluded from distributions during 2011 30,610,000  
Number of Designated Units to be excluded from distributions during 2012 26,130,000  
Number of Designated Units to be excluded from distributions during 2013 23,700,000  
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  
Cash Distribution [Member] | First Quarter Distribution [Member]
    
Distributions to Partners [Abstract]    
Distribution Per Common Unit (in dollars per unit) $ 0.6700 $ 0.6275
Record Date Apr. 30, 2013 Apr. 30, 2012
Payment Date May 07, 2013 May 09, 2012
Cash Distribution [Member] | Second Quarter Distribution [Member]
    
Distributions to Partners [Abstract]    
Distribution Per Common Unit (in dollars per unit) $ 0.6800 $ 0.6350
Record Date Jul. 31, 2013 Jul. 31, 2012
Payment Date Aug. 07, 2013 Aug. 08, 2012
Cash Distribution [Member] | Third Quarter Distribution [Member]
    
Distributions to Partners [Abstract]    
Distribution Per Common Unit (in dollars per unit) $ 0.6900 $ 0.6500
Record Date Oct. 31, 2013 Oct. 31, 2012
Payment Date Nov. 07, 2013 Nov. 08, 2012
Cash Distribution [Member] | Fourth Quarter Distribution [Member]
    
Distributions to Partners [Abstract]    
Distribution Per Common Unit (in dollars per unit) $ 0.7000 $ 0.6600
Record Date Jan. 31, 2014 Jan. 31, 2013
Payment Date Feb. 07, 2014 Feb. 07, 2013