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Fair Value Measurements (Reconciliation of Liability) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value at beginning of period $ 10,065 $ 6,388
Contingent consideration payments (161) 0
Change in fair value of contingent consideration 243 (407)
Fair value at end of period $ 10,147 $ 5,981