UNIT-BASED COMPENSATION PLANS - Schedule of LTIP Activity (Details) - LTIP - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Number of LP Units
Beginning Balance (in units)	906	813
Granted (in units)	435	409
Vested (in units)	(312)	(231)
Forfeited (in units)	(18)	(85)
Ending Balance (in units)	1,011	906
Weighted Average Grant Date Fair Value per LP Unit
Beginning Balance (in dollars per unit)	$ 63.56	$ 59.36
Granted (in dollars per unit)	73.45	71.79
Vested (in dollars per unit)	62.08	63.27
Forfeited (in dollars per unit)	67.32	63.92
Ending Balance (in dollars per unit)	$ 68.20	$ 63.56