PARTNERS' CAPITAL (Details)		1 Months Ended			9 Months Ended
	Jan. 03, 2012	Jul. 31, 2019 $ / item	Apr. 30, 2019 $ / item	Jan. 31, 2019 $ / item	Sep. 30, 2019 item $ / item	Sep. 30, 2018 $ / item	Dec. 31, 2018 $ / item	Jun. 30, 2018 $ / item	Mar. 31, 2018 $ / item	Aug. 20, 2007
Depositary receipts exchange ratio for Class A units | item					30
Quarterly distribution per unit approved (in dollars per unit)		9.60	9.60	9.60
Quarterly distributions per depositary receipt (in dollars per receipt)		0.32	(0.32)	0.32		0.30	0.30	0.30	0.30
Quarterly distribution per unit (in dollars per unit)						9.00	9.00	9.00	9.00
Earnings per depository receipt
Net Income per Depositary Receipt (in dollars per receipt)					1.26	0.69
Distributions per Depositary Receipt (in dollars per share)					0.96	0.90
Limited Partner
Number of classes of partners | item					2
General Partnership
Number of classes of partners | item					1
Fixed distribution percentage of unit holders					1.00%
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%