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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets Amortization Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Intangible Assets, Net        
Amortization expense $ 16,693 $ 6,258 $ 34,165 $ 12,501