EQUITY COMPENSATION (Restricted Units) (Details) $ / shares in Units, $ in Thousands					3 Months Ended								12 Months Ended
	Nov. 21, 2016 $ / shares	Aug. 23, 2016 $ / shares	May 24, 2016 $ / shares	Mar. 14, 2016 $ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Dec. 31, 2016 USD ($) item $ / shares shares	Apr. 30, 2014 USD ($)
Equity compensation
Number of quarterly distributions declared | item													4
Quarterly distribution declared (in dollars per unit)	$ 0.20	$ 0.28	$ 0.15	$ 0.20	$ 0.28	$ 0.20	$ 0.28	$ 0.15	$ 0.20	$ 0.13	$ 0.26	$ 0.25
Weighted Average Grant Date Fair Value
Unrecognized compensation expenses | $														$ 60,500
Restricted units
Equity compensation
Distribution equivalents made to holders | $													$ 6,100
Units
Balance at the beginning of the period (in units) | shares								4,657,761					4,657,761
Restricted stock granted (in units) | shares													3,988,873
Vested (in units) | shares													(47,729)
Forfeited (in units) | shares													(540,533)
Balance at the end of the period (in units) | shares					8,058,372				4,657,761				8,058,372
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per unit)								$ 18.01					$ 18.01
Granted (in dollars per unit)													14.58
Vested (in dollars per unit)													17.32
Forfeited (in dollars per unit)													16.95
Balance at the end of the period (in dollars per unit)					$ 16.38				$ 18.01				$ 16.38
Unrecognized compensation expenses | $					$ 82,700								$ 82,700
Weighted average period of compensation expense expected to be recognized													3 years 18 days