CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 29, 2015	Dec. 28, 2014
Accounts receivable, allowances	$ 13,047	$ 12,860
Accumulated depreciation and amortization	$ 867,433	$ 853,363
Common stock, par value (USD per share)	$ 0.1	$ 0.1
Class A Common Stock
Authorized shares (in shares)	300,000,000	300,000,000
Issued shares (in shares)	167,943,762	151,701,136
Treasury shares (in shares)	2,462,839	2,180,442
Class B Common Stock
Authorized shares (in shares)	816,635	816,635
Issued shares (in shares)	816,635	816,635
Treasury shares (in shares)	0	0

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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