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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
Jun. 30, 2019
Dec. 31, 2018
Due To And From Broker Dealers And Clearing Organizations [Abstract]    
Receivables from clearing organizations $ 579,892 $ 320,277
Deposits paid for securities borrowed 146,245 109,795
Securities failed to deliver 40,207 85,502
Receivables from brokers, dealers and clearing organizations, Total $ 766,344 $ 515,574