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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Receivables from and Payables to Brokers, Dealers, and Clearing Agencies [Abstract]
Interest On Margin Payable	$ 233	$ 297	$ 752	$ 1,128

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- Definition

Interest On Margin Payable

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No definition available.

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