Counterparty Risk (Tables)

9 Months Ended

Sep. 30, 2012

Counterparty Risk [Abstract]

% Of Total Collateral On Reverse Repurchase Agreements

	% of Total Collateral on
	Reverse Repurchase
Dealer	Agreements
J.P. Morgan Securities Inc.	19	%
Royal Bank of Canada	19	%
Deutsche Bank	16	%

% Of Total Deposits With Dealers Held As Collateral

	% of Total Deposits with
	Dealers Held as
Dealer	Collateral
Citigroup	40	%
Bank of America	26	%

% Of Total Receivable For Securities Sold

	% of Total Receivable for
Dealer	Securities Sold
CS First Boston	35	%
Morgan Stanley	18	%

Components Of Receivable For Securities Sold And Payable For Securities Purchased

		September 30, 2012					December 31, 2011
(In thousands)		Receivables		Payables			Receivables		Payables
Trades pending settlement	$	494,842	$	(149,085	)	$	533,708	$	(127,517	)
Securities failed to deliver/receive		29,690		(29,368	)		0		0
Total	$	524,533	$	(178,453	)	$	533,708	$	(127,517	)