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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining nine months of 2018 $ 17,463
2018 18,036
2019 16,832
2020 15,378
2021 14,009
Thereafter (excluding in-process technology) 76,840
Net carrying amount $ 158,558