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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Investments $ 2,890   $ 3,032  
Investment income (loss) $ (143) $ (17)    
Kingstone Holding Company        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 15.00%     15.00%
Investments $ 2,900   $ 3,000  
Investment income (loss) $ (100) $ 0