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Other Intangible Assets, net and Goodwill - Estimated Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Finite-lived intangible assets, Net $ 6,801,142 $ 7,209,105
Total intangible assets, Net $ 6,964,081 $ 7,370,350