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INVESTMENTS (Other Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015
Other Investments [Line Items] |  |  |
Other investments | $ 1,009,587 | $ 1,009,373 |
Percentage of total fair value | 100.00% | 100.00% |
Long/short equity funds |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 25,489 | $ 38,470 |
Percentage of total fair value | 3.00% | 4.00% |
Redemption notice period | 60 days | 60 days |
Multi-strategy funds |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 283,298 | $ 286,164 |
Percentage of total fair value | 28.00% | 28.00% |
Multi-strategy funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 17,000 | $ 16,000 |
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 |
Event-driven funds |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 37,680 | $ 39,177 |
Percentage of total fair value | 4.00% | 4.00% |
Redemption notice period | 45 days | 45 days |
Direct lending funds |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 261,902 | $ 250,681 |
Percentage of total fair value | 26.00% | 25.00% |
Direct lending funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 128,000 | $ 137,000 |
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 | $ 65,811 | $ 68,812 |
Percentage of total fair value | 7.00% | 7.00% |
Unfunded commitments related to other investments | $ 18,000 | $ 21,000 |
Investment term | 10 years |  |
Real estate funds |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 54,720 | $ 50,009 |
Percentage of total fair value | 5.00% | 5.00% |
Real estate funds | Other Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments | $ 105,000 | $ 115,000 |
Investment term | 7 years |  |
CLO-Equities |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 28,556 | $ 31,413 |
Percentage of total fair value | 2.00% | 2.00% |
Other privately held investments |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 48,787 | $ 46,430 |
Percentage of total fair value | 5.00% | 5.00% |
Overseas deposits |  |  |
Other Investments [Line Items] |  |  |
Other investments | $ 203,344 | $ 198,217 |
Percentage of total fair value | 20.00% | 20.00% |
Hedge funds | Lockup Redemption Restriction |  |  |
Other Investments [Line Items] |  |  |
Fair value of other investments subject to redemption restrictions | $ 25,000 | $ 38,000 |
Percentage of fair value of other investments subject to redemption restrictions | 7.00% | 11.00% |
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
Open-Ended Commercial Mortgage Income Fund |  |  |
Other Investments [Line Items] |  |  |
Unfunded commitments related to other investments |  | $ 75,000 |

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