EQUITY COMPENSATION (Equity Incentive Plan) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
Equity compensation
Equity compensation expenses	$ 32,557	$ 27,552
Restricted units
Equity compensation
Equity compensation expenses	28,381	23,012
Restricted units with a market condition
Equity compensation
Equity compensation expenses	4,133	891
Options
Equity compensation
Equity compensation expenses	43	3,101
Phantom Shares
Equity compensation
Equity compensation expenses	$ 0	$ 548
Ares Management L.P
Equity compensation
Total number of shares available for grant under the Equity Incentive Plan (in shares)	34,495,433		37,528,029