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INVESTMENTS (DETAILS 5) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2013
Other Investments [Line Items] |  |  |  |  |
Other investments | $ 853,101 | $ 853,101 | $ 965,465 |  |
Percentage of total fair value | 100.00% | 100.00% | 100.00% |  |
Hedge Funds [Member] | Lockup Redemption Restriction [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Fair value of other investments subject to redemption restrictions | $ 98,000 | $ 98,000 | $ 87,000 |  |
Percentage of fair value of other investments subject to redemption restrictions | 14.00% | 14.00% | 11.00% |  |
Long/short equity funds [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Other investments | $ 192,622 | $ 192,622 | $ 298,907 |  |
Percentage of total fair value | 23.00% | 23.00% | 31.00% |  |
Redemption frequency |  | Quarterly, Semi-annually, Annually | Quarterly, Semi-annually |  |
Long/short equity funds [Member] | Minimum [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Redemption notice period |  | 30 days | 30 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 | $ 345,726 | $ 345,726 | $ 324,020 |  |
Percentage of total fair value | 41.00% | 41.00% | 34.00% |  |
Redemption frequency |  | Quarterly, Semi-annually | Quarterly, Semi-annually |  |
Optional extension of investment term |  | 3 years |  |  |
Multi-strategy funds [Member] | Other Redemption Restriction [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Unfunded commitments related to other investments | $ 23,000 | $ 23,000 |  |  | $ 60,000
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 | $ 147,236 | $ 147,236 | $ 185,899 |  |
Percentage of total fair value | 17.00% | 17.00% | 19.00% |  |
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 | $ 75 | $ 75 | $ 9,713 |  |
Percentage of total fair value | 0.00% | 0.00% | 1.00% |  |
Redemption frequency |  |  | Quarterly |  |
Redemption notice period |  |  | 65 days |  |
Direct Lending Funds [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Other investments | $ 73,628 | $ 73,628 | $ 54,438 |  |
Percentage of total fair value | 9.00% | 9.00% | 6.00% |  |
Optional extension of investment term |  | 3 years |  |  |
Direct Lending Funds [Member] | Other Redemption Restriction [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Fair value of other investments subject to redemption restrictions | $ 73,628 | $ 73,628 | $ 54,438 |  |
Percentage of fair value of other investments subject to redemption restrictions | 9.00% | 9.00% | 6.00% |  |
Unfunded commitments related to other investments | $ 138,000 | $ 138,000 | $ 88,000 |  |
Direct Lending Funds [Member] | Minimum [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Investment term |  | 5 years |  |  |
Direct Lending Funds [Member] | Maximum [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Investment term |  | 10 years |  |  |
Real Estate Funds [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Other investments | $ 3,000 | $ 3,000 | $ 0 |  |
Percentage of total fair value | 0.00% | 0.00% | 0.00% |  |
Investment term | 8 years |  |  |  |
Real Estate Funds [Member] | Other Redemption Restriction [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Unfunded commitments related to other investments | $ 97,000 | $ 97,000 |  | $ 100,000 |
Commitment period | 3 years |  |  |  |
CLO-Equities [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Other investments | $ 90,814 | $ 90,814 | $ 92,488 |  |
Percentage of total fair value | 10.00% | 10.00% | 9.00% |  |
Bank Revolver Opportunity Funds [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Investment term | 7 years |  |  |  |
Optional extension of investment term | 2 years |  |  |  |
Bank Revolver Opportunity Funds [Member] | Other Redemption Restriction [Member] |  |  |  |  |
Other Investments [Line Items] |  |  |  |  |
Unfunded commitments related to other investments | $ 50,000 | $ 50,000 |  |  |

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