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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 77,293 $ 60,348
Other intangible assets, accumulated amortization $ 1,299,958 $ 1,180,393
Class A common stock, par value $ 0.01 $ 0.01
Class A common stock, shares authorized 525,000,000 525,000,000
Class A common stock, shares issued 335,755,183 336,912,783
Class A common stock, shares outstanding 335,755,183 336,912,783