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Receivables from and Payables to Customers Amounts Receivable from Customers (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables From and Payables to Customers [Abstract]    
Cash accounts $ 6,135pjc_ReceivablesDueFromCustomersonCashAccounts $ 5,013pjc_ReceivablesDueFromCustomersonCashAccounts
Margin accounts 3,523pjc_ReceivablesDueFromCustomersonMarginAccounts 6,620pjc_ReceivablesDueFromCustomersonMarginAccounts
Total receivables $ 9,658us-gaap_ReceivablesFromCustomers $ 11,633us-gaap_ReceivablesFromCustomers