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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 45,685 $ 46,606
Other intangible assets, accumulated amortization $ 676,848 $ 589,236
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 335,575,365 334,230,496
Class A common stock, shares outstanding 335,575,365 334,230,496