Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 01, 2016
Statement of Financial Position [Abstract]      
Accounts receivable, allowance for doubtful accounts $ 21,469 $ 20,539 $ 22,654
Preferred Stock, par value (in USD per share) $ 1 $ 1 $ 1
Preferred Stock, shares authorized (in shares) 25,000,000 25,000,000 25,000,000
Preferred Stock, shares outstanding (in shares) 0 0 0
Common Stock, stated value (in USD per share) $ 0.25 $ 0.25 $ 0.25
Common Stock, shares authorized (in shares) 1,200,000,000 1,200,000,000 1,200,000,000
Common Stock, shares outstanding (in shares) 394,502,698 414,012,954 413,682,259