Quarterly report pursuant to Section 13 or 15(d)

Receivables (Loans Receivable and Credit Quality Indicators) (Details)

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Receivables (Loans Receivable and Credit Quality Indicators) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables and Secured Loans Gross - Trading Operations $ 83,356 $ 94,613
Percentage of secured loans 100.00% 100.00%
Trading segment secured loans 31,935 35,585
Loan-to-value of 75% or more
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of secured loans 39.10% 10.60%
Trading segment secured loans 12,493 3,764
Loan-to-value of less than 75%
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of secured loans 60.90% 89.40%
Trading segment secured loans 19,442 31,821
Secured loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables and Secured Loans Gross - Trading Operations 31,935 35,585
Percentage of secured loans 100.00% 100.00%
Secured loans | Bullion
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables and Secured Loans Gross - Trading Operations 19,403 21,993
Percentage of secured loans 60.80% 61.80%
Secured loans | Collectibles
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables and Secured Loans Gross - Trading Operations $ 12,532 $ 13,592
Percentage of secured loans 39.20% 38.20%