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Goodwill and Intangible Assets - Future Amortization Expense (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 2018 $ 10,140
2019 39,647
2020 38,386
2021 31,025
2022 $ 29,141