Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 1,727	$ 1,290
Common stock, par value (in dollars per share)	$ 0.8333	$ 0.8333
Common stock, shares authorized (in shares)	110,000,000	110,000,000
Common stock, shares outstanding (in shares)	96,634,070	96,242,784
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	0	0