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Goodwill and Intangible Assets - Future Amortization (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Estimated annual amortization expense  
2018 (remaining) $ 12,062
2019 46,113
2020 45,996
2021 43,705
2022 43,235
Thereafter 502,962
Net, finite-lived intangible assets $ 694,073