Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 28, 2014		Dec. 31, 2013
Preferred stock, shares authorized	100,000,000	[1]	100,000,000
Preferred stock, shares outstanding	0	[1]	0
Common stock, par value	$ 0.01	[1]	$ 0.01
Common stock, shares authorized	300,000,000	[1]	300,000,000
Common stock, shares issued	88,142,219	[1]	88,062,341
Common stock held in treasury, shares	7,928,855	[1]	7,311,037
Series A convertible preferred stock
Preferred stock, shares authorized	10,896,250	[1]	10,896,250

[1] Unaudited.