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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Receivables from and Payables to Brokers, Dealers, and Clearing Agencies [Abstract]        
Interest On Margin Payable $ 222 $ 415 $ 519 $ 831