Counterparty Risk (Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2014
Risks and Uncertainties [Abstract]
Investments held with dealers as collateral	$ 1,370,000,000
Unencumbered investments held in custody	131,100,000
Concentration risk threshold	15.00%
Pledged Financial Instruments, Not Separately Reported, Securities For Repurchase Agreements Unsettled	$ 31,100,000

Threshold used by the Company to determine disclosure of counterparty concentration risk.

No definition available.

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements which have been sold prior to period end but remain unsettled at the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of securities that are free and clear of any encumbrances such as reverse repurchase agreements.

+ References

No definition available.

+ Details

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (b)(1)(i)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729

+ Details

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- Details

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