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Partners' Capital and Distributions (Details) (USD $)
 0 Months Ended 12 Months Ended
Oct. 02, 2012
Dec. 31, 2012
Dec. 31, 2011
Partners' Capital and Distributions      
Common unitholders, units outstanding (in units)   335,283,874 310,753,874
Effective aggregate common ownership interest in the Partnership and its subsidiaries (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  
Unit split conversion ratio 2    
General Partner Distribution - Level One
      
Partners Capital and Distribution      
Percent of distribution amount to the general partner above threshold as incentive distributions   15.00%  
Quarterly incentive distribution threshold amount (in dollars per unit)   0.2250  
General Partner Distribution - Level Two
      
Partners Capital and Distribution      
Percent of distribution amount to the general partner above threshold as incentive distributions   25.00%  
Quarterly incentive distribution threshold amount (in dollars per unit)   0.2475  
General Partner Distribution - Level Three
      
Partners Capital and Distribution      
Percent of distribution amount to the general partner above threshold as incentive distributions   50.00%  
Quarterly incentive distribution threshold amount (in dollars per unit)   0.3375