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Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Amounts Receivable From Brokers, Dealers, And Clearing Organizations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Due To And From Broker Dealers And Clearing Organizations [Abstract]    
Receivables from clearing organizations $ 320,277 $ 270,285
Deposits paid for securities borrowed 109,795 132,776
Securities failed to deliver 85,502 56,046
Receivables from brokers, dealers and clearing organizations, Total $ 515,574 $ 459,107