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Intangible Assets and Goodwill - Estimated Future Amortization of Intangible Assets, Other Than Goodwill (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2019 $ 20,524
2020 20,591
2021 19,820
2022 16,967
2023 13,799
Estimated future amortization expense over next five years $ 91,701