CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 30, 2012
Accounts receivable, allowances	$ 16,117	$ 17,390
Property, plant and equipment, accumulated depreciation and amortization	963,033	941,728
Goodwill, accumulated impairment losses	$ 805,218	$ 805,218
Common stock, par value	$ 0.10	$ 0.10
Class A Common Stock
Authorized shares	300,000,000	300,000,000
Issued shares	150,446,997	150,270,975
Treasury shares	2,399,737	2,483,537
Class B Common Stock
Authorized shares	818,385	818,385
Issued shares	818,385	818,385
Treasury shares	0	0