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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Identifiable intangible assets (net of accumulated amortization of $267.7 million, $228.2 million, and $248.0 million, respectively) $ 524,153 $ 553,114 $ 566,737
Deferred income taxes 59,827 67,900 49,937
Other noncurrent assets 794,724 833,212 832,127
Identifiable intangible assets, accumulated amortization $ 267,700 $ 248,000 $ 228,200