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Goodwill and Other Intangible Assets - Finite-lived Intangible Assets Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Definite-lived intangible asset amortization expense $ 303,977 $ 288,293