Quarterly report pursuant to Section 13 or 15(d)

Secured Loans Receivable (Summary of Carrying-value of Secured Loans) (Details)

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Secured Loans Receivable (Summary of Carrying-value of Secured Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current and long-term) $ 88,871 $ 91,238
Secured loans originated by company and with related party [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current and long-term) 32,287 30,864
Secured loans originated    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current and long-term) 30,072 30,864
Secured loans originated - with a related party    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current and long-term) 2,215 0
Secured loans acquired    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current and long-term) $ 56,584 $ 60,374