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INVESTMENTS (DETAILS 4) (USD $)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
Hedge funds [Member]
Lockup Redemption Restriction [Member]
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Dec. 31, 2012
Hedge funds [Member]
Lockup Redemption Restriction [Member]
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Dec. 31, 2013
Hedge funds [Member]
Other Redemption Restriction [Member]
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Dec. 31, 2012
Hedge funds [Member]
Other Redemption Restriction [Member]
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Dec. 31, 2013
Long/short equity funds [Member]
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Dec. 31, 2012
Long/short equity funds [Member]
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Dec. 31, 2013
Long/short equity funds [Member]
Minimum [Member]
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Dec. 31, 2012
Long/short equity funds [Member]
Minimum [Member]
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Dec. 31, 2013
Long/short equity funds [Member]
Maximum [Member]
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Dec. 31, 2012
Long/short equity funds [Member]
Maximum [Member]
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Dec. 31, 2013
Multi-strategy funds [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
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Nov. 21, 2013
Multi-strategy funds [Member]
Other Redemption Restriction [Member]
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Dec. 31, 2013
Multi-strategy funds [Member]
Minimum [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
Minimum [Member]
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Dec. 31, 2013
Multi-strategy funds [Member]
Maximum [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
Maximum [Member]
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Dec. 31, 2013
Event driven funds [Member]
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Dec. 31, 2012
Event driven funds [Member]
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Dec. 31, 2013
Event driven funds [Member]
Minimum [Member]
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Dec. 31, 2012
Event driven funds [Member]
Minimum [Member]
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Dec. 31, 2013
Event driven funds [Member]
Maximum [Member]
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Dec. 31, 2012
Event driven funds [Member]
Maximum [Member]
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Dec. 31, 2013
Leveraged bank loan funds [Member]
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Dec. 31, 2012
Leveraged bank loan funds [Member]
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Dec. 31, 2013
Direct Lending Funds [Member]
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Dec. 31, 2012
Direct Lending Funds [Member]
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Dec. 31, 2013
Direct Lending Funds [Member]
Other Redemption Restriction [Member]
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Dec. 31, 2012
Direct Lending Funds [Member]
Other Redemption Restriction [Member]
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Dec. 31, 2013
Direct Lending Funds [Member]
Minimum [Member]
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Dec. 31, 2013
Direct Lending Funds [Member]
Maximum [Member]
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Dec. 31, 2013
CLO-Equities [Member]
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Dec. 31, 2012
CLO-Equities [Member]
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Aug. 01, 2013
CLO-Equities [Member]
Other Redemption Restriction [Member]
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| Other Investments [Line Items] | ||||||||||||||||||||||||||||||||||||
| Other investments | $ 1,045,810,000 | $ 843,437,000 | $ 425,444,000 | $ 302,680,000 | $ 285,155,000 | $ 244,075,000 | $ 190,458,000 | $ 171,479,000 | $ 48,753,000 | $ 62,768,000 | $ 22,134,000 | $ 0 | $ 73,866,000 | $ 62,435,000 | ||||||||||||||||||||||
| Percentage of total fair value | 100.00% | 100.00% | 41.00% | 36.00% | 27.00% | 29.00% | 18.00% | 20.00% | 5.00% | 8.00% | 2.00% | 0.00% | 7.00% | 7.00% | ||||||||||||||||||||||
| Redemption frequency | Monthly, Quarterly, Semi-annually | Monthly, Quarterly, Semi-annually | Quarterly, Semi-annually | Quarterly, Semi-annually | Quarterly, Annually | Quarterly, Annually | Quarterly | Quarterly | ||||||||||||||||||||||||||||
| Redemption notice period | 30 days | 30 days | 60 days | 60 days | 60 days | 60 days | 95 days | 95 days | 45 days | 45 days | 60 days | 95 days | 65 days | 65 days | ||||||||||||||||||||||
| Fair value of other investments subject to redemption restrictions | 99,000,000 | 38,000,000 | 11,000,000 | 29,000,000 | 22,134,000 | 0 | ||||||||||||||||||||||||||||||
| Percentage of fair value of other investments subject to redemption restrictions | 10.00% | 5.00% | 2.00% | 0.00% | ||||||||||||||||||||||||||||||||
| Unfunded commitments related to other investments | $ 54,000,000 | $ 60,000,000 | $ 88,000,000 | $ 40,000,000 | $ 27,000,000 | $ 60,000,000 | ||||||||||||||||||||||||||||||
| Investment term | 5 years | 10 years | ||||||||||||||||||||||||||||||||||
| Optional extension of investment term | 3 years | 3 years | ||||||||||||||||||||||||||||||||||