CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013
Accounts receivable, allowances	$ 12,741	$ 14,252
Property, plant and equipment, accumulated depreciation and amortization	$ 901,189	$ 870,982
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Class A Common Stock [Member]
Authorized shares	300,000,000	300,000,000
Issued shares	151,662,423	151,289,625
Treasury shares	2,180,442	2,180,471
Class B Common Stock [Member]
Authorized shares	816,835	818,061
Issued shares	816,835	818,061
Treasury shares	0	0