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Acquisitions, Goodwill And Other Intangible Assets (Summary of Estimated Amortization Expense) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Finite-Lived Intangible Assets |  |  |
Amortization expense | $ 19,573 | $ 17,758 | $ 16,055
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity |  |  |
2017 | 19,300 |  |
2018 | 17,352 |  |
2019 | 14,578 |  |
2020 | 12,918 |  |
2021 | 11,397 |  |
Cost of Sales |  |  |
Finite-Lived Intangible Assets |  |  |
Amortization expense | 5,631 | 5,967 | 6,017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity |  |  |
2017 | 5,324 |  |
2018 | 4,680 |  |
2019 | 3,633 |  |
2020 | 3,093 |  |
2021 | 2,229 |  |
Selling, General and Administrative Expenses |  |  |
Finite-Lived Intangible Assets |  |  |
Amortization expense | 13,942 | $ 11,791 | $ 10,038
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity |  |  |
2017 | 13,976 |  |
2018 | 12,672 |  |
2019 | 10,945 |  |
2020 | 9,825 |  |
2021 | $ 9,168 |  |

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