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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Identifiable intangible assets (net of accumulated amortization of $277.5 million, $238.1 million, and $248.0 million, respectively) $ 519,861 $ 553,114 $ 552,332
Identifiable intangible assets, accumulated amortization 277,500 248,000 238,100
Deferred income taxes $ 60,850 $ 67,900 $ 63,551