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Acquired Intangible Assets - Calculation Of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 (six months ended June 30) $ 186,702  
2019 346,701  
2020 275,188  
2021 187,202  
2022 177,208  
2023 and beyond 295,377  
Total $ 1,468,378 $ 1,472,542