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SHARE BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Carry Unit Awards      
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    
Weighted average fair value (in dollars per unit) $ 2.10   $ 2.50
Employee and non-employee share-based compensation expense $ 17,501 $ 7,848  
Employee share-based compensation expense 16,872 5,786  
Non-employee share-based compensation expense $ 629 $ 2,062  
Carry Unit Awards | Second Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 50.00%    
Carry Unit Awards | Third Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 25.00%    
Carry Unit Awards | Fourth Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 25.00%    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee share-based compensation expense $ 4,122