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Property, Plant, and Equipment (Schedule of Capitalized Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property, Plant, and Equipment        
Capitalized interest $ 176 $ 607 $ 611 $ 1,841