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Acquired Intangible Assets - Calculation Of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (three months ended June 30) $ 94,776  
2019 352,401  
2020 280,888  
2021 190,763  
2022 177,208  
2023 and beyond 295,377  
Total $ 1,391,413 $ 1,472,542