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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Identifiable intangibles (net of amortization of $218.3 million, $179.0 million, and $207.9 million, respectively) $ 580,497 $ 587,528 $ 635,143
Accumulated amortization 218,300 207,900 179,000
Deferred income taxes 50,510 49,937 78,922
Other 217,846 209,541 214,454
Total other noncurrent assets $ 848,853 $ 847,006 $ 928,519