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INCOME TAXES (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 07, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense (benefit) |  |  | $ (6,000) | $ 3,500 | $ 3,300
Deferred income tax expense (benefit) |  |  | 3,200 | $ 400 |
Deferred tax asset related to capital losses |  |  | $ 4,500 |  |
Fees and other income |  |  |  |  | 2,500
Applicable cash savings, percentage |  |  | 85.00% |  |
Applicable cash savings available to entity, percentage |  |  | 15.00% |  |
Amount payable pursuant to tax receivable agreement | [1] |  | $ 1,559 |  | 1,570
Other assets |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred tax liabilities |  |  | (900) |  |
Deferred tax asset |  |  |  |  | 2,300
Accrued Liabilities |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized tax benefits |  |  | 900 |  | $ 800
Amount Payable Pursuant to Tax Receivable Agreement |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Amount payable pursuant to tax receivable agreement |  |  | $ 1,600 |  |
Subsequent Event |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Fees and other income collected |  | $ 2,400 |  |  |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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