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SHARE BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
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 $ 2.14 $ 2.14 $ 2.50
Employee and Non-employee Share-based Compensation Expense $ 7,993 $ 25,494  
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 $ 4,233 $ 8,355