CASH DISTRIBUTIONS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
CASH DISTRIBUTIONS
Cash distributions (in dollars per unit)	$ 0.75	$ 0.73	$ 1.50	$ 1.46