UNIT-BASED COMPENSATION PLANS - Summary of Changes in Options Outstanding (Details) - Option Plan - Limited Partners - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of LP Units
Beginning Balance (in units)	26	46
Exercised (in units)	(5)	(18)
Forfeited, cancelled or expired (in units)	(4)	(2)
Ending Balance (in units)	17	26	46
Exercisable balance (in units)	17
Weighted- Average Strike Price ($/LP Unit)
Beginning Balance (in dollars per unit)	$ 48.18	$ 47.32
Exercised (in dollars per unit)	47.38	46.62
Forfeited, cancelled or expired (in dollars per unit)	46.65	42.10
Ending Balance (in dollars per unit)	48.71	$ 48.18	$ 47.32
Exercisable balance (in dollars per unit)	$ 48.71
Weighted- Average Remaining Contractual Term
Outstanding balance	10 months 24 days	1 year 7 months 6 days	2 years 4 months 24 days
Exercisable balance	10 months 24 days
Aggregate Intrinsic Value
Outstanding balance	$ 300	$ 703	$ 1,080
Exercisable balance	$ 300