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INVESTMENTS (Other Investments) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) fund | Dec. 31, 2020 USD ($) | Dec. 31, 2015 USD ($)
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 790,530 | $ 829,156 |
Percentage of total fair value | 100.00% | 100.00% |
Long/short equity funds |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 19,033 | $ 25,300 |
Percentage of total fair value | 2.00% | 3.00% |
Redemption notice period | 60 days | 60 days |
Multi-strategy funds |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 106,971 | $ 121,420 |
Percentage of total fair value | 14.00% | 15.00% |
Multi-strategy funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 20,000 | $ 20,000 |
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 | 95 days | 95 days |
Direct lending funds |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 279,324 | $ 272,131 |
Percentage of total fair value | 35.00% | 33.00% |
Redemption notice period | 90 days | 90 days |
Direct lending funds | Quarterly Redemption |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 38,000 | $ 38,000 |
Number of funds | fund | 1 |  |
Direct lending funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 187,000 | 151,000 |
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 | 15 years |  |
Private equity funds |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 153,515 | $ 124,706 |
Percentage of total fair value | 19.00% | 15.00% |
Private equity funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 137,000 | $ 166,000 |
Investment term | 5 years |  |
Real estate funds |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 163,635 | $ 164,250 |
Percentage of total fair value | 21.00% | 20.00% |
Redemption notice period | 45 days | 45 days |
Real estate funds | Quarterly Redemption |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 66,000 | $ 61,000 |
Number of funds | fund | 1 |  |
Real estate funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 191,000 | 201,000 |
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 | $ 6,269 | $ 6,173 |
Percentage of total fair value | 1.00% | 1.00% |
Other privately held investments |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 61,783 | $ 70,011 |
Percentage of total fair value | 8.00% | 8.00% |
Overseas deposits |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 0 | $ 45,165 |
Percentage of total fair value | 0.00% | 5.00% |
Hedge funds | Lockup Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Fair value of other investments subject to redemption restrictions | $ 19,000 | $ 25,000 |
Percentage of fair value of other investments subject to redemption restrictions | 15.00% | 17.00% |
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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