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INVESTMENTS (DETAILS 4) (USD $)
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6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 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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Jun. 30, 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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Jun. 30, 2013
Long/short equity funds [Member]
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Dec. 31, 2012
Long/short equity funds [Member]
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Jun. 30, 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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Jun. 30, 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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Jun. 30, 2013
Multi-strategy funds [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
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Jun. 30, 2013
Multi-strategy funds [Member]
Minimum [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
Minimum [Member]
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Jun. 30, 2013
Multi-strategy funds [Member]
Maximum [Member]
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Dec. 31, 2012
Multi-strategy funds [Member]
Maximum [Member]
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Jun. 30, 2013
Event driven funds [Member]
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Dec. 31, 2012
Event driven funds [Member]
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Jun. 30, 2013
Event driven funds [Member]
Minimum [Member]
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Dec. 31, 2012
Event driven funds [Member]
Minimum [Member]
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Jun. 30, 2013
Event driven funds [Member]
Maximum [Member]
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Dec. 31, 2012
Event driven funds [Member]
Maximum [Member]
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Jun. 30, 2013
Leveraged bank loan funds [Member]
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Dec. 31, 2012
Leveraged bank loan funds [Member]
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Jun. 30, 2013
Direct Lending Funds [Member]
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Dec. 31, 2012
Direct Lending Funds [Member]
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Jun. 30, 2013
Direct Lending Funds [Member]
Other Redemption Restriction [Member]
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Jun. 30, 2012
Direct Lending Funds [Member]
Other Redemption Restriction [Member]
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Jun. 30, 2013
Direct Lending Funds [Member]
Minimum [Member]
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Jun. 30, 2013
Direct Lending Funds [Member]
Maximum [Member]
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Jun. 30, 2013
CLO-Equities [Member]
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Dec. 31, 2012
CLO-Equities [Member]
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| Other Investments [Line Items] | ||||||||||||||||||||||||||||||||||
| Other investments | $ 962,315,000 | $ 843,437,000 | $ 397,917,000 | $ 302,680,000 | $ 264,688,000 | $ 244,075,000 | $ 192,185,000 | $ 171,479,000 | $ 50,249,000 | $ 62,768,000 | $ 4,232,000 | $ 0 | $ 53,044,000 | $ 62,435,000 | ||||||||||||||||||||
| Percentage of total fair value | 100.00% | 100.00% | 41.00% | 36.00% | 28.00% | 29.00% | 20.00% | 20.00% | 5.00% | 8.00% | 0.00% | 0.00% | 6.00% | 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 | 95 days | 95 days | 65 days | 65 days | ||||||||||||||||||||
| Fair value of other investments subject to redemption restrictions | 95,000,000 | 38,000,000 | 14,000,000 | 29,000,000 | 4,232,000 | 0 | ||||||||||||||||||||||||||||
| Percentage of fair value of other investments subject to redemption restrictions | 10.00% | 5.00% | 0.00% | 0.00% | ||||||||||||||||||||||||||||||
| Unfunded commitments related to direct lending funds | $ 106,000,000 | $ 40,000,000 | ||||||||||||||||||||||||||||||||
| Investment term | 5 years | 10 years | ||||||||||||||||||||||||||||||||
| Optional extension of investment term | 3 years | |||||||||||||||||||||||||||||||||