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Patents Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2018 $ 15,534
2019 3,508
2020 1,683
2021 822
2022 817
Thereafter 735
Total expected amortization expense $ 23,099