EQUITY COMPENSATION (Equity Incentive Plan) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2019
Equity compensation
Equity compensation expenses	$ 30,336	$ 22,393	$ 91,576	$ 73,974
Restricted units
Equity compensation
Equity compensation expenses	30,036	21,430	86,804	66,226
Restricted units with a market condition
Equity compensation
Equity compensation expenses	300	911	4,729	2,702
Options
Equity compensation
Equity compensation expenses	0	52	43	4,310
Phantom shares
Equity compensation
Equity compensation expenses	$ 0	$ 0	$ 0	$ 736
Ares Management L.P
Equity compensation
Total number of shares available for grant under the Equity Incentive Plan (in shares)	34,055,707		34,055,707		37,528,029