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SHARE BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Carry Unit Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Repurchase period following termination     60 days      
Repurchase period following fourth anniversary       60 days    
Carry unit plan, written promissory note period       3 years    
Share-based Compensation Arrangement, Weighted Average Fair Value Per Unit $ 2.28     $ 2.28   $ 2.50
Employee and Non-employee Share-based Compensation Expense $ 7,510 $ 15,005   $ 33,004 $ 40,932  
Carry Unit Awards [Member] | Second Anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       50.00%    
Carry Unit Awards [Member] | Third Anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       25.00%    
Carry Unit Awards [Member] | Fourth Anniversary            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting percentage       25.00%    
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee and Non-employee Share-based Compensation Expense $ 4,817     $ 13,172