FAIR VALUE (Investments Using NAV per Share) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
FAIR VALUE
Investments Measured at NAV	$ 325,715	$ 339,243
Unfunded Commitments	$ 197,791	291,208
Minimum
FAIR VALUE
Redemption restriction period	0 days
Maximum
FAIR VALUE
Redemption restriction period	60 days
Credit Group
FAIR VALUE
Investments Measured at NAV	$ 53,131	98,251
Unfunded Commitments	30,896	89,917
Private Equity
FAIR VALUE
Investments Measured at NAV	181,096	157,234
Unfunded Commitments	96,687	78,700
Real Estate
FAIR VALUE
Investments Measured at NAV	71,669	56,547
Unfunded Commitments	35,708	99,802
Operations Management Group
FAIR VALUE
Investments Measured at NAV	19,819	27,211
Unfunded Commitments	$ 34,500	$ 22,789

Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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No definition available.

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Period when redemption restriction has been in effect for investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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- Definition

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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