PARTNERS' CAPITAL (Details) (USD $)	1 Months Ended	6 Months Ended							6 Months Ended	1 Months Ended	6 Months Ended			6 Months Ended
	Jan. 31, 2012	Jun. 30, 2012 USDPerUnit	Jun. 30, 2011 USDPerUnit	Sep. 30, 2012 USDPerUnit	Mar. 31, 2012 USDPerUnit	Dec. 31, 2011 USDPerUnit	Sep. 30, 2011 USDPerUnit	Mar. 31, 2011 USDPerUnit	Jun. 30, 2012 Limited Partner item	Jan. 31, 2012 Class A	Jun. 30, 2012 Class A USDPerUnit	Jan. 17, 2012 Class A USDPerUnit	Jan. 03, 2012 Class A	Jun. 30, 2012 Class B	Jun. 30, 2012 General Partnership item
Number of classes of 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	7.00	7.5	7.5	7.00	7.00	7.00			7.50	7
Quarterly distributions per depositary receipt (in dollars per share)		$ 0.25	$ 0.23	$ 0.25	$ 0.25	$ 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)		$ 0.42	$ 0.12
Income from Discontinued Operations (in dollars per share)			$ 1.98
Net Income per Depositary Receipt after Discontinued Operations (in dollars per share)		$ 0.42	$ 2.10
Distributions per Depositary Receipt (in dollars per share)		$ 0.50	$ 0.46			$ 0.93