Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 29, 2019	Dec. 29, 2018
Assets:
Property, plant and equipment, accumulated depreciation	$ 1,343,741	$ 1,246,095
Intangible assets, accumulated amortization	$ 448,654	$ 423,575
Stockholders’ equity:
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	168,410,054	168,098,177
Treasury stock, shares	3,661,004	3,437,579