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Summary of Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Summary of Significant Accounting Policies (Textuals) [Abstract] |  |  |  |
Amortization expense | $ 3.7 | $ 3.5 | $ 7.4 | $ 7.1
Future Amortization Expense Current Year |  |  | 15.1 |
Aggregate amortization expense for 2020 | 15.4 |  | 15.4 |
Aggregate amortization expense for 2021 | 14.1 |  | 14.1 |
Aggregate amortization expense for 2023 | 12.7 |  | 12.7 |
Aggregate amortization expense for 2024 | 13.3 |  | 13.3 |
Aggregate amortization expense for 2025 | 11.7 |  | 11.7 |
Purchased Intangible Amortization, Gross | 3.5 | 3.3 | 6.9 | 6.7
Purchased intangible amortization, net of tax | 2.6 | 2.5 | 5.2 | 5.0
Amortization expense associated with capitalized software | 8.5 | 8.4 | 17.0 | 16.5
Share - based compensation expense | $ 4.3 | $ 3.9 | $ 8.8 | $ 8.2

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