Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Assets:
Property, plant and equipment, accumulated depreciation	$ 467,749	$ 381,314
Intangible assets, accumulated amortization	$ 146,900	$ 105,070
Stockholders’ equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	165,917,726	165,261,003
Treasury stock, shares	1,259,664	993,578