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Property, Plant, and Equipment (Schedule of Capitalized Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Property, Plant, and Equipment        
Capitalized interest $ 208 $ 633 $ 435 $ 1,234