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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 41,980 $ 43,455
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value ( in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 480,000,000 480,000,000
Common stock, shares issued 178,783,000 178,784,000
Common stock shares outstanding 143,031,000 143,455,000
Treasury stock, shares 35,752,000 35,329,000