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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining three months of 2018 $ 5,685
2019 17,954
2020 16,754
2021 15,417
2022 14,069
Thereafter (excluding in-process technology) 76,189
Net carrying amount $ 146,068