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Supporting Financial Information - Maturities of Debt Obligations (Details) - Notes Payable to Banks [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Debt Instrument [Line Items]    
Year 1 $ 6,667  
Year 2 3,750  
Year 3 3,750  
Year 4 4,583  
Total bank debt obligation $ 18,750 $ 19,688