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Investments (Available for sale equity investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Marketable Securities [Abstract]    
Amortized cost, equity investments $ 27,962 $ 14,851
Estimated market value, equity investments 36,183 25,125
Common stocks [Member]    
Marketable Securities [Abstract]    
Amortized cost, equity investments 9,775 9,775
Estimated market value, equity investments 17,927 20,015
Non-redeemable preferred stocks [Member]    
Marketable Securities [Abstract]    
Amortized cost, equity investments 18,187 5,076
Estimated market value, equity investments $ 18,256 $ 5,110