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EQUITY COMPENSATION (Equity Incentive Plan) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Jan. 01, 2018
Equity compensation            
Equity compensation expense   $ 89,724 $ 69,711 $ 39,065    
Restricted units            
Equity compensation            
Stock to be settled (in units) 2,000,000 4,957,869        
Equity compensation expense   $ 74,441 54,339 21,894    
Restricted units with a market condition            
Equity compensation            
Stock to be settled (in units) 666,666 1,333,334        
Equity compensation expense   $ 1,524 0 0    
Options            
Equity compensation            
Granted (in units)   0        
Equity compensation expense   $ 12,449 13,848 15,450    
Phantom units            
Equity compensation            
Equity compensation expense   $ 1,310 $ 1,524 $ 1,721    
Ares Management L.P            
Equity compensation            
Total number of units available for grant under the Equity Incentive Plan   27,281,855       31,853,504
IPO | Restricted units            
Equity compensation            
Stock to be settled (in units)         4,936,051  
IPO | Options            
Equity compensation            
Granted (in units)         24,835,227  
IPO | Phantom units            
Equity compensation            
Stock to be settled (in units)         686,395