Goodwill and Intangible Assets - Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 11,818
Finite-Lived Intangible Assets, Amortization Expense, Year Two	13,920
Finite-Lived Intangible Assets, Amortization Expense, Year Three	5,355
Finite-Lived Intangible Assets, Amortization Expense, Year Four	4,267
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,555
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 3,246