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Goodwill and Intangible Assets - Amortization (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Estimated aggregate amortization expense  
2019 $ 16,820
2020 15,894
2021 12,772
2022 10,438
2023 8,675
Thereafter 17,370
Net Amount, Definite-lived intangible assets $ 81,969