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INVESTMENTS (Other Investments) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Other Investments [Line Items] |  |
Other investments, at fair value | $ 802,064 | $ 787,787
Percentage of total fair value | 100.00% | 100.00%
Long/short equity funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 30,526 | $ 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 | $ 165,123 | $ 167,819
Percentage of total fair value | 21.00% | 22.00%
Multi-strategy funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 39,000 | $ 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
Direct lending funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 273,864 | $ 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 | $ 193,000 | $ 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 | $ 60,285 | $ 64,566
Percentage of total fair value | 8.00% | 8.00%
Unfunded commitments related to other investments | $ 15,000 | $ 16,000
Investment term | 10 years |
Real estate funds |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 134,763 | $ 84,202
Percentage of total fair value | 17.00% | 11.00%
Real estate funds | Other Redemption Restriction |  |
Other Investments [Line Items] |  |
Unfunded commitments related to other investments | $ 100,000 | $ 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 | $ 17,798 | $ 21,271
Percentage of total fair value | 1.00% | 2.00%
Other privately held investments |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 28,452 | $ 44,518
Percentage of total fair value | 4.00% | 6.00%
Overseas deposits |  |
Other Investments [Line Items] |  |
Other investments, at fair value | $ 91,253 | $ 104,154
Percentage of total fair value | 11.00% | 13.00%
Hedge funds | Lockup Redemption Restriction |  |
Other Investments [Line Items] |  |
Fair value of other investments subject to redemption restrictions | $ 63,000 | $ 27,000
Percentage of fair value of other investments subject to redemption restrictions | 32.00% | 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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