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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Identifiable intangibles (net of amortization of $179.5 million, $162.3 million, and $168.8 million, respectively) $ 612,234 $ 639,203 $ 193,793
Deferred income taxes 74,992 76,750 580,113
Nonamortizable identifiable intangibles 0 0 467,038
Other 205,138 229,008 222,050
Total other noncurrent assets 892,364 944,961 1,462,994
Accumulated amortization $ 179,500 $ 168,800 $ 162,300