Goodwill and Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 1,365
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5,355
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4,267
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,555
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,246
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 3,246