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Goodwill and Other Intangible Assets - Future Amortization (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity  
2018 $ 51,883
2019 50,914
2020 47,363
2021 46,421
2022 46,354
Thereafter 296,061
Total estimated future aggregate amortization expense $ 538,996