PARTNERS' CAPITAL AND DISTRIBUTIONS - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended
	Nov. 22, 2016	Oct. 24, 2016	Sep. 30, 2016	Sep. 30, 2015
Distributions to unitholders
Actual cash distributions			$ 469,764	$ 439,578
Limited Partners
Distributions to unitholders
Actual cash distributions			$ 472,100	$ 442,000
Distribution per LP unit (in dollars per share)			$ 3.6	$ 3.45
Limited Partners | Forecast
Distributions to unitholders
Actual cash distributions	$ 161,800
Limited Partners | Subsequent event
Distributions to unitholders
Cash distributions declared (in dollars per share)		$ 1.225