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Goodwill and Intangible Assets - Future Amortization (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Estimated annual amortization expense  
2018 (remaining) $ 32,753
2019 43,970
2020 43,951
2021 43,814
2021 43,691
Thereafter 501,960
Net, finite-lived intangible assets $ 710,139