QUARTERLY FINANCIAL DATA (unaudited) (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net income per common unit (in dollars per unit)	$ 0.63	$ 0.58	$ 0.40	$ 0.52	$ 0.56	$ 0.64	$ 0.60	$ 0.71	$ 2.13	[1]	$ 2.51	[1]	$ 3.02	[1]
As previously recast
Net income per common unit (in dollars per unit)						$ 0.88
Adjustment
Net income per common unit (in dollars per unit)						$ (0.24)

[1] (a) Recast as discussed in Note 2 and Note 6.