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Goodwill and Other Intangible Assets - Finite-lived Intangible Assets Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Definite-lived intangible asset amortization expense $ 311,221 $ 308,721 $ 617,528 $ 612,698