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Counterparty Risk (Narrative) (Details) (USD $)	3 Months Ended
Counterparty Risk (Narrative) (Details) (USD $)	Mar. 31, 2013
Risks and Uncertainties [Abstract]
Investments held with dealers as collateral	$ 1,100,000,000
Unencumbered investments held in custody	$ 248,300,000
Concentration risk threshold	15.00%

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.

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