CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 29, 2019
Accounts receivable, allowances	$ 13,646	$ 14,358
Accumulated depreciation and amortization	$ 978,828	$ 950,881
Common stock, par value (in USD per share)	$ 0.1	$ 0.1
Class A Common Stock
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	174,820,777	174,242,668
Treasury stock shares (in shares)	8,870,801	8,870,801
Class B Common Stock
Common stock, shares authorized (in shares)	803,404	803,404
Common stock, shares issued (in shares)	803,404	803,404