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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Schedule Of Due To (From) Broker-Dealers And Clearing Organizations) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables from Brokers-Dealers and Clearing Agencies [Abstract]
Deposits with clearing agencies	$ 250	$ 750
Unsettled regular way trades, net	2,543
Receivables from clearing agencies	82,578	102,846
Receivables from brokers, dealers, and clearing agencies	85,371	103,596
Payables to Broker-Dealers and Clearing Agencies [Abstract]
Unsettled regular way trades, net		1,997
Margin payable	107,291	128,561
Payables to brokers, dealers, and clearing agencies	$ 107,291	$ 130,558

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Payables from unsettled regular way trades, net.

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Amount of right to receive cash and securities on deposit with broker-dealers to demonstrate an intention to complete a purchase (good faith deposit) and collateral deposited by counterparty to cover the credit risk assumed (margin deposit).

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Amount of other payables due to broker-dealers or clearing organizations.

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Amount payable to broker-dealers and clearing organizations, including, but not limited to, securities failed-to-receive, certain deposits received for securities loaned, open transactions, and floor-brokerage payables.

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

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Amount of right to receive cash and securities on deposit with clearing organizations. Clearing organizations perform post trade processing and trade comparisons among numerous broker-dealers and act as settlement agents between buying and selling broker-dealers.

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