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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 95,533 $ 72,725
Other intangible assets, accumulated amortization 1,556,537 1,358,528
Investments in unconsolidated entities, fair value $ 116,314 $ 124,262
Class A common stock, par value (in USD per share) $ 0.01 $ 0.01
Class A common stock issued (in shares) 335,561,345 334,752,283
Class A common stock outstanding (in shares) 335,561,345 334,752,283