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Intangible Assets - Future Amortization (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Estimated annual amortization expense  
2017 (remaining) $ 10,518
2018 42,071
2019 42,052
2020 41,919
2021 41,814
Thereafter 538,445
Net, finite-lived intangible assets $ 716,819