Receivables from and Payable to Brokers (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012 broker	Dec. 31, 2011
Brokers and Dealers [Abstract]
Receivable from brokers	$ 103,825	$ 62,046
Payable to brokers	$ 203,250	$ 213,360
Number of brokers (brokers)	8

- Definition

Aggregate amounts payable to broker-dealers and clearing organizations include amounts payable for securities failed to receive, certain deposits received for securities loaned, amounts payable to clearing organizations on open transactions, and floor-brokerage payables. In addition, the net receivable or payable arising from unsettled trades would be reflected in those captions. A broker-dealer that purchases securities, either for its own account or for a customer's account, but does not receive the securities on the settlement date records the amount of money representing the purchase price of the securities, including any accrued interest, as a liability to the selling broker-dealer. This liability is paid when the securities are received by the purchasing broker-dealer.

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