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Goodwill and Other Intangible Assets - Amortization Expense of Acquired Intangible Assets (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 40,404
2020 31,594
2021 31,594
2022 31,594
2023 and thereafter 145,390
Total $ 280,576