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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]          
Investments $ 2,831   $ 2,831   $ 3,032
Investment income (loss) $ (110) $ (444) $ (200) $ 227  
Kingstone Holding Company          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 15.00%   15.00%