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Intangible Assets Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Intangible Assets Disclosure [Abstract]    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 15,522  
Finite-Lived Intangible Assets, Amortization Expense, Year Three   $ 15,130
Finite-Lived Intangible Assets, Amortization Expense, Year Four   10,529
Finite-Lived Intangible Assets, Amortization Expense, Year Four   7,154
Finite-Lived Intangible Assets, Amortization Expense, Year Five   $ 4,791