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Goodwill and Other Intangible Assets, Net - Future Estimated Amortization Expense (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Estimated future intangible amortization expense, 2019 $ 190,281
Estimated future intangible amortization expense, 2020 185,492
Estimated future intangible amortization expense, 2021 180,661
Estimated future intangible amortization expense, 2022 176,734
Estimated future intangible amortization expense, 2023 $ 176,621