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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 40,512 $ 42,409
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) 179,102,000 179,103,000
Common stock shares outstanding (shares) 139,353,000 139,542,000
Treasury stock (shares) 39,749,000 39,561,000