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PARTNERS' CAPITAL (Details)
 6 Months Ended
Jan. 03, 2012
Jun. 30, 2015
item
$ / shares
$ / item
Jun. 30, 2014
$ / shares
$ / item
Mar. 31, 2015
$ / shares
$ / item
Dec. 31, 2014
$ / shares
$ / item
Sep. 30, 2014
$ / shares
$ / item
Mar. 31, 2014
$ / shares
$ / item
Aug. 20, 2007
Quarterly distribution per unit (in dollars per unit)   7.50 7.50 7.50 7.50 7.50 7.50  
Quarterly distributions per depositary receipt (in dollars per share) | $ / shares   $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25  
Distribution per unit (in dollars per unit) | $ / shares         $ 30.00      
Earnings per depository receipt                
Net Income per Depositary Receipt after Discontinued Operations   0.40 0.07          
Distributions per Depositary Receipt (in dollars per share)   0.50 0.50   1.00      
Limited Partner                
Number of classes of partners | item   2            
Class A                
Fixed distribution percentage of unit holders   80.00%            
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
Class B                
Fixed distribution percentage of unit holders   19.00%            
General Partnership                
Number of classes of partners | item   1            
Fixed distribution percentage of unit holders   1.00%