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Goodwill and Intangible Assets - Future Amortization Expense (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 2018 $ 36,644
2019 41,215
2020 38,160
2021 30,525
2022 $ 28,879