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PARTNERS' CAPITAL (Details) (USD $)
 1 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Jan. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Limited Partner
item
Jan. 31, 2012
Class A
Sep. 30, 2012
Class A
USDPerUnit
Dec. 31, 2012
Class A
USDPerUnit
Jun. 30, 2012
Class A
USDPerUnit
Mar. 31, 2012
Class A
USDPerUnit
Jan. 03, 2012
Class A
Dec. 31, 2011
Class A
USDPerUnit
Sep. 30, 2011
Class A
USDPerUnit
Jun. 30, 2011
Class A
USDPerUnit
Mar. 31, 2011
Class A
USDPerUnit
Sep. 30, 2012
Class B
Sep. 30, 2012
General Partnership
item
Number of classes of limited partners         2                       1
Fixed distribution percentage of unit holders             80.00%                 19.00% 1.00%
Forward split of depositary receipts 3                                
Exchange ratio of depositary receipts for partnership units before adjustment           10                      
Exchange ratio of depositary receipts for partnership units after adjustment           30                      
Number of units in each depository receipt                     0.03333            
Quarterly distribution per unit (in dollars per unit)             7.50 7.50 7.50 7.50   7.00 7.00 7.00 7.00    
Quarterly distributions per depositary receipt (in dollars per share)             $ 0.25 $ 0.25 $ 0.25 $ 0.25   $ 0.23 $ 0.23 $ 0.23 $ 0.23    
Distribution per unit (in dollars per unit)       $ 28.00                          
Earnings per depository receipt                                  
Income per Depositary Receipt before Discontinued Operations (in dollars per share)   $ 0.62 $ 0.23                            
Income from Discontinued Operations (in dollars per share)     $ 1.98                            
Net Income per Depositary Receipt after Discontinued Operations (in dollars per share)   $ 0.62 $ 2.21                            
Distributions per Depositary Receipt (in dollars per share)   $ 0.75 $ 0.70 $ 0.93