Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jul. 01, 2017	Dec. 31, 2016
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	72,563,291	80,563,291
Common stock held in treasury, shares	4,499,508	11,131,648
Series A convertible preferred stock
Preferred stock, shares authorized	10,896,250	10,896,250