Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Consolidated Balance Sheets
Property, plant and equipment, accumulated depreciation (in dollars)	$ 277,493	$ 270,454
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, Authorized shares	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized shares	125,000,000	125,000,000
Common stock, shares issued	64,120,497	64,044,649
Common stock, shares outstanding	64,120,497	64,044,649