CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 24, 2012	Dec. 25, 2011
Assets
Accounts receivable, allowances	$ 17,177	$ 17,412
Property, plant and equipment, accumulated depreciation and amortization	916,705	868,798
Goodwill, accumulated impairment losses	999,950	805,218
Other intangible assets acquired, accumulated amortization	$ 72,382	$ 69,952
Stockholders' Equity
Common stock, par value	$ 0.10	$ 0.10
Class A Common Stock
Stockholders' Equity
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	150,085,772	150,007,446
Treasury stock, shares	2,836,305	2,979,786
Class B Common Stock
Stockholders' Equity
Common stock, shares authorized	818,385	818,885
Common stock, shares issued	818,385	818,885
Treasury stock, shares	0	0