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INVESTMENTS (Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Other Investments [Line Items] |  |
Other investments, at fair value | $ 795,331 | $ 787,787
Percentage of total fair value | 100.00% | 100.00%
Long/short equity funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 29,324 | $ 26,779
Percentage of total fair value | 4.00% | 3.00%
Redemption notice period | 60 days | 60 days
Multi-strategy funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 149,509 | $ 153,883
Percentage of total fair value | 19.00% | 20.00%
Multi-strategy funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 53,000 | $ 84,000
Multi-strategy funds | Minimum |  |
Other Investments [Line Items] |  |
Redemption notice period | 60 days | 60 days
Multi-strategy funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 2 years |
Multi-strategy funds | Maximum |  |
Other Investments [Line Items] |  |
Redemption notice period | 90 days | 95 days
Event-driven funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 5,914 | $ 13,936
Percentage of total fair value | 1.00% | 2.00%
Redemption notice period |  | 45 days
Direct lending funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 272,752 | $ 274,478
Percentage of total fair value | 34.00% | 35.00%
Direct lending funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 200,000 | $ 210,000
Optional extension of investment term | 3 years |
Direct lending funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 5 years |
Direct lending funds | Maximum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 10 years |
Private equity funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 61,526 | $ 64,566
Percentage of total fair value | 8.00% | 8.00%
Unfunded commitments related to other investments | $ 16,000 | $ 16,000
Investment term | 10 years |
Real estate funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 111,169 | $ 84,202
Percentage of total fair value | 14.00% | 11.00%
Real estate funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 115,000 | $ 147,000
Real estate funds | Minimum | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Investment term | 7 years |
CLO-Equities |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 18,022 | $ 21,271
Percentage of total fair value | 1.00% | 2.00%
Other privately held investments |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 47,685 | $ 44,518
Percentage of total fair value | 6.00% | 6.00%
Overseas deposits |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 99,430 | $ 104,154
Percentage of total fair value | 13.00% | 13.00%
Hedge funds | Lockup Redemption Restriction |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | $ 42,000 | $ 27,000
Percentage of fair value of other investments subject to redemption restrictions | 23.00% | 14.00%
Bank Revolver Opportunity Funds |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 50,000 |
Investment term | 7 years |
Optional extension of investment term | 2 years |

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- Definition The percentage of the total fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. + References No definition available. + Details
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