Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Assets:
Property, plant and equipment, accumulated depreciation	$ 891,451	$ 842,186
Intangible assets, accumulated amortization	$ 315,008	$ 301,187
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	167,816,001	167,641,415
Treasury stock, shares	3,164,276	3,028,857