Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 03, 2021	Dec. 31, 2020
Trade accounts and notes receivable, allowance for doubtful accounts	$ 2,225	$ 2,384
Property, plant and equipment, accumulated depreciation	611,886	574,257
Intangible assets, Accumulated amortization	470,006	445,795
Unamortized discount and debt issuance costs	$ 8,618	$ 9,217
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	135,823,851	135,148,774
Common stock, shares outstanding	135,621,451	134,946,374
Treasury stock, shares outstanding	202,400	202,400