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PARTNERS' CAPITAL (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 31, 2013
Limited Partner
item
Jan. 03, 2012
Class A
Mar. 31, 2013
Class A
Feb. 04, 2013
Class A
Dec. 31, 2012
Class A
Sep. 30, 2012
Class A
Jun. 30, 2012
Class A
Mar. 31, 2012
Class A
Aug. 20, 2007
Class A
Mar. 31, 2013
Class B
Mar. 31, 2013
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             0.1    
Quarterly distribution per unit (in dollars per unit)             $ 7.50 $ 7.50 $ 7.50 $ 7.50 $ 7.50      
Quarterly distributions per depositary receipt (in dollars per share)             $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25      
Distribution per unit (in dollars per unit)     $ 30.00                      
Earnings per depository receipt                            
Income per Depositary Receipt before Discontinued Operations (in dollars per share) $ 0.23 $ 0.16                        
Net Income (loss) per Depositary Receipt after Discontinued Operations (in dollars per share) $ 0.23 $ 0.16                        
Distributions per Depositary Receipt (in dollars per share) $ 0.25 $ 0.25 $ 1.00