PARTNERS' CAPITAL (Details) (USD $)	6 Months Ended			6 Months Ended	0 Months Ended	6 Months Ended								6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Limited Partner item	Jan. 03, 2012 Class A	Jun. 30, 2013 Class A	Aug. 31, 2013 Class A	Jun. 14, 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	Jun. 30, 2013 Class B	Jun. 30, 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	$ 7.50
Quarterly distributions per depositary receipt (in dollars per share)							$ 0.25	$ 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)	$ 0.43	$ 0.41
Income from Discontinued Operations (in dollars per share)	$ 0.95	$ 0.01
Net Income (loss) per Depositary Receipt after Discontinued Operations (in dollars per share)	$ 1.38	$ 0.42
Distributions per Depositary Receipt (in dollars per share)	$ 0.50	$ 0.50	$ 1.00