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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Receivables, allowance for doubtful accounts $ 42,409 $ 39,543
Other intangible assets, accumulated amortization $ 122,283 $ 87,486
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 480,000,000 480,000,000
Common stock, shares issued (in shares) 179,103,000 179,006,000
Common stock shares outstanding (in shares) 139,542,000 141,258,000
Treasury stock, shares (in shares) 39,561,000 37,748,000