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INVESTMENTS (Details 5) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 830,253 | $ 830,219 |
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 | $ 64,000 | $ 60,000 |
Percentage of fair value of other investments subject to redemption restrictions | 16.00% | 12.00% |
Long/short equity funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 64,067 | $ 118,619 |
Percentage of total fair value | 8.00% | 14.00% |
Redemption notice period | 60 days |  |
Long/short equity funds [Member] | Minimum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period |  | 45 days |
Long/short equity funds [Member] | Maximum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period |  | 60 days |
Multi-strategy funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 286,452 | $ 285,992 |
Percentage of total fair value | 35.00% | 34.00% |
Multi-strategy funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 16,000 | $ 12,000 |
Multi-strategy funds [Member] | Minimum [Member] |  |  |
Other Investments [Line Items] |  |  |
Redemption notice period | 60 days | 60 days |
Multi-strategy funds [Member] | Minimum [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Optional extension of investment term | 2 years |  |
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, at fair value | $ 48,578 | $ 93,539 |
Percentage of total fair value | 6.00% | 11.00% |
Redemption notice period | 45 days | 45 days |
Direct Lending Funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 232,389 | $ 134,650 |
Percentage of total fair value | 28.00% | 16.00% |
Direct Lending Funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 142,000 | $ 176,000 |
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, at fair value | $ 71,896 | $ 81,223 |
Percentage of total fair value | 9.00% | 10.00% |
Unfunded commitments related to other investments | $ 21,000 | $ 24,000 |
Investment term | 10 years |  |
Real Estate Funds [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 46,691 | $ 13,354 |
Percentage of total fair value | 6.00% | 2.00% |
Real Estate Funds [Member] | Other Redemption Restriction [Member] |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 120,000 | $ 140,000 |
Investment term | 7 years |  |
CLO-Equities [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 36,782 | $ 60,700 |
Percentage of total fair value | 3.00% | 8.00% |
Other Privately Held Investments [Member] |  |  |
Other Investments [Line Items] |  |  |
Other investments, at fair value | $ 43,398 | $ 42,142 |
Percentage of total fair value | 5.00% | 5.00% |
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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