Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense on intangible assets $ 6,681 $ 4,941
Future amortization expense [Abstract]    
Future amortization expense for the remainder 2018 22,201  
Future amortization expense 2019 27,747  
Future amortization expense 2020 25,925  
Future amortization expense 2021 24,350  
Future amortization expense 2022 $ 22,928