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Goodwill and Intangible Assets - Future Amortization (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Estimated annual amortization expense  
2018 (remaining) $ 22,528
2019 46,128
2020 46,109
2021 44,893
2022 43,673
Thereafter 501,793
Net, finite-lived intangible assets $ 705,124