INVESTMENTS (DETAILS 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Other Investments [Line Items]
Total other investments	$ 643,270	$ 519,296
Percentage of total fair value	100.00%	100.00%
Single Fund Hedge Funds [Member]
Other Investments [Line Items]
Total other investments	267,055	123,036
Percentage of total fair value	42.00%	24.00%
Funds Of Hedge Funds [Member]
Other Investments [Line Items]
Total other investments	230,187	235,240
Percentage of total fair value	36.00%	45.00%
Long Short Credit Funds [Member]
Other Investments [Line Items]
Total other investments	66,823	82,846
Percentage of total fair value	10.00%	16.00%
Distressed Securities Credit Funds [Member]
Other Investments [Line Items]
Total other investments	20,563	21,911
Percentage of total fair value	3.00%	4.00%
CLO Equity Tranched Securities [Member]
Other Investments [Line Items]
Total other investments	$ 58,642	$ 56,263
Percentage of total fair value	9.00%	11.00%

This element represents the total fair market value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Subparagraph (a)

-Paragraph 6A

-URI http://asc.fasb.org/extlink&oid=6925170&loc=SL6742756-110258

Name:	us-gaap_AlternativeInvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant