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Partners' Capital and Distributions (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Partners' Capital and Distributions    
Common unitholders, units outstanding (in units) 359,133,200 335,283,874
Ownership interest (as a percent) 98.00%  
General partner ownership interest (as a percent) 2.00%  
Percentage of available cash distributed (as a percent) 100.00%  
Number of days after end of quarter within which distributions must be paid to unitholders 45 days  
Percentage of distribution amount to the general partner as per ownership interest 2.00%  
General Partner Distribution - Level One
   
Partners Capital and Distribution    
Percent of distribution amount to the general partner before incentive distributions 2.00%  
General Partner Distribution - Level Two
   
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 15.00%  
Quarterly incentive distribution threshold amount (in dollars per unit) $ 0.2250  
General Partner Distribution - Level Three
   
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 25.00%  
Quarterly incentive distribution threshold amount (in dollars per unit) $ 0.2475  
General Partner Distribution - Level Four
   
Partners Capital and Distribution    
Percent of distribution amount to the general partner above threshold 50.00%  
Quarterly incentive distribution threshold amount (in dollars per unit) $ 0.3375