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Other Noncurrent Assets - Schedule of Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Other Assets, Noncurrent [Abstract]      
Identifiable intangibles (net of amortization of $179.0 million, $157.9 million, and $168.8 million, respectively) $ 635,143 $ 639,203 $ 198,156
Deferred income taxes 78,922 76,750 554,056
Nonamortizable identifiable intangibles 0 0 461,179
Other 214,454 229,008 212,784
Total other noncurrent assets 928,519 944,961 1,426,175
Accumulated amortization $ 179,000 $ 168,800 $ 157,900