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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 34,057 $ 41,131
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (shares) 20,000,000 20,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (shares) 480,000,000 480,000,000
Common stock, shares issued (shares) 179,429,000 179,400,000
Common stock shares outstanding (shares) 135,152,000 137,284,000
Treasury stock (shares) 44,277,000 42,116,000