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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 |  |

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