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Patents Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2018 $ 15,212
2019 18,527
2020 6,134
2021 5,261
2022 5,256
Thereafter 6,197
Total expected amortization expense $ 56,587