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INVESTMENTS (DETAILS 5) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Mar. 01, 2016
Other Investments [Line Items] |  |  |
Other investments | $ 859,639 | $ 816,756 |
Percentage of total fair value | 100.00% | 100.00% |
Hedge Funds [Member] | Lockup Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Fair value of other investments subject to redemption restrictions | $ 59,000 | $ 66,000 |
Percentage of fair value of other investments subject to redemption restrictions | 10.00% | 10.00% |
Long/short equity funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 128,502 | $ 154,348 |
Percentage of total fair value | 15.00% | 19.00% |
Redemption frequency | Quarterly, Semi-annually, Annually | Quarterly, Semi-annually, Annually |
Long/short equity funds [Member] | Minimum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 45 days | 45 days |
Long/short equity funds [Member] | Maximum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 60 days | 60 days |
Multi-strategy funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 312,211 | $ 355,073 |
Percentage of total fair value | 36.00% | 43.00% |
Redemption frequency | Quarterly, Semi-annually | Quarterly, Semi-annually |
Multi-strategy funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 12,000 | $ 12,000 |
Optional extension of investment term | 3 years |  |
Multi-strategy funds [Member] | Minimum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 60 days | 60 days |
Multi-strategy funds [Member] | Maximum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 95 days | 95 days |
Event driven funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 146,428 | $ 147,287 |
Percentage of total fair value | 17.00% | 18.00% |
Redemption frequency | Quarterly, Annually | Quarterly, Annually |
Event driven funds [Member] | Minimum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 45 days | 45 days |
Event driven funds [Member] | Maximum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 60 days | 60 days |
Leveraged bank loan funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 65 | $ 65 |
Percentage of total fair value | 0.00% | 0.00% |
Direct Lending Funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 112,889 | $ 90,120 |
Percentage of total fair value | 13.00% | 11.00% |
Direct Lending Funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 198,000 | $ 222,000 |
Optional extension of investment term | 3 years |  |
Direct Lending Funds [Member] | Minimum [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Investment term | 5 years |  |
Direct Lending Funds [Member] | Maximum [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Investment term | 10 years |  |
Private Equity Funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 93,783 | $ 0 |
Percentage of total fair value | 11.00% | 0.00% |
Unfunded commitments related to other investments | $ 41,000 |  | $ 135,000
Investment term | 10 years |  |
Real Estate Funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 5,390 | $ 4,929 |
Percentage of total fair value | 1.00% | 1.00% |
Real Estate Funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 95,000 | $ 95,000 |
Investment term | 8 years |  |
Commitment period | 3 years |  |
CLO-Equities [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 60,371 | $ 64,934 |
Percentage of total fair value | 7.00% | 8.00% |
Bank Revolver Opportunity Funds [Member] |  |  |
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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