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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
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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

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