Derivative Asset Fair Value percentage

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- Definition

Fair Values Combined Total Cash and Cash Equivalents and Investments Held Under Trust

+ Details

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- Definition

A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).

+ Details

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- Definition

Letter Of Credit Remaining

+ Details

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- Definition

Net Asset Value, Explicit Leverage

+ Details

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- Definition

Notification Period For Fund Quarterly Redemption

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- Definition

Number Of Funds Remaining

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- Definition

Number Of Hedge Fund Investments Held

+ Details

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- Definition

Number Of Hedging Funds Not Eligible For Redemption

+ Details

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- Definition

Number of Long Exposure Funds

+ Details

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- Definition

Percentage Of long Exposure greater Than Fund's Net Asset Value

+ Details

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- Definition

Percentage Of Remaining Value of Fund Representing

+ Details

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- Definition

Percentage, Value Of The Fund Representing

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- Definition

Portion of Total Fair Value of Its Investments and Cash and Cash Equivalents, Percentage

+ Details

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- Definition

Relates to remaining lock up periods of hedge funds.

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- Definition

Total Maximum Collateral Portion Of Letters Of Credit

+ Details

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- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 17
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 61
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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- Definition

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph b(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph b(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

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- Definition

Fair value of all derivative assets designated as fair value hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

+ Details

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Number FAS115-1/124-1
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name FASB Staff Position (FSP)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The sum of the fair values, as of the date of each statement of financial position presented, of assets which are owned but transferred to serve as collateral for the payment of debt obligations, primarily secured borrowings, repurchase agreements or other current or potential obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 15
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728

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Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2010	Jun. 30, 2011	Dec. 31, 2010
Pledged Assets, cash and cash equivalents and investments		$ 286,393	$ 280,175
Collateralized portion of the facilites		1,300,000
Trusts contained assets		1,321,751	1,377,266
Percentage of long exposure greater than fund's net asset value		100.00%
Combined total cash and cash equivalents and investments		2,662,349	2,778,786
Total letter of credit facilities outstanding		871,437	848,834
Remaining credit facility used for third-party beneficiaries		828,563	851,166
Number of securities in an unrealized loss position		0	9
Other than temporary impairment	168
Other Invested Assets [Member]
Number of hedge fund investments held		21
Total fair value		562,267
Fair value of its investments and cash and cash equivalents		6.80%
Private Equity Funds [Member]
Number of hedge fund investments held		4
Private Equity Funds [Member] \| Minimum [Member]
Remaining restriction period of funds		8Y
Private Equity Funds [Member] \| Maximum [Member]
Remaining restriction period of funds		10Y
Distressed Funds [Member]
Number of hedge fund investments held		5
Funds not eligible for redemption		3
Percentage, value of the fund representing		34.00%
Distressed Funds [Member] \| Minimum [Member]
Remaining restriction period of funds		1Y
Distressed Funds [Member] \| Maximum [Member]
Remaining restriction period of funds		8Y
Distressed Funds [Member] \| Sixty Five Day Notification Period [Member]
Percentage, value of the fund representing		42.00%
Redemption notification period, days		65D
Distressed Funds [Member] \| Forty Five Day Notification Period [Member]
Percentage, value of the fund representing		24.00%
Redemption notification period, days		45D
Equity Long/Short Funds [Member]
Number of hedge fund investments held		5
Funds not eligible for redemption		1
Percentage, value of the fund representing		24.00%
Number of long exposure funds		3
Net asset value, explicit leverage		117.00%
Number Of Funds Remaining		4
Equity Long/Short Funds [Member] \| Minimum [Member]
Net asset value, explicit leverage		110.00%
Redemption notification period, days		45D
Equity Long/Short Funds [Member] \| Maximum [Member]
Remaining restriction period of funds		18M
Net asset value, explicit leverage		120.00%
Redemption notification period, days		90D
Equity Long/Short Funds [Member] \| Thirty, Forty Five, And Sixty Day Notification Period [Member]
Percentage, remaining value of fund representing		76.00%
Equity Long/Short Funds [Member] \| Sixty Five Day Notification Period [Member]
Redemption notification period, days		65D
Equity Long/Short Funds [Member] \| Forty Five Day Notification Period [Member]
Number of hedge fund investments held		1
Redemption notification period, days		45D
Equity Long/Short Funds [Member] \| Thirty Day Notification Period [Member]
Number of hedge fund investments held		1
Redemption notification period, days		30D
Equity Long/Short Funds [Member] \| Sixty Day Notification Period [Member]
Number of hedge fund investments held		2
Redemption notification period, days		60D
Multi-strategy Funds [Member]
Number of hedge fund investments held		4
Funds not eligible for redemption		3
Number of long exposure funds		1
Net asset value, explicit leverage		133.00%
Multi-strategy Funds [Member] \| Minimum [Member]
Redemption notification period, days		45D
Multi-strategy Funds [Member] \| Maximum [Member]
Redemption notification period, days		90D
Multi-strategy Funds [Member] \| Sixty Five Day Notification Period [Member]
Net asset value, percentage		33.33%
Hedge Funds [Member]
Number of long exposure funds		5
Event Driven Funds [Member]
Number of hedge fund investments held		2
Percentage, value of the fund representing		52.00%
Percentage, remaining value of fund representing		48.00%
Number of long exposure funds		1
Net asset value, explicit leverage		151.00%
Event Driven Funds [Member] \| Maximum [Member]
Remaining restriction period of funds		2Y
Pledged Assets [Member]
Total letter of credit facilities outstanding		7,295	7,295
Remaining credit facility used for third-party beneficiaries		$ 864,142	$ 841,539