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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 26, 2012	Dec. 28, 2011
Assets [Abstract]
Accumulated depreciation	$ 249,715	$ 241,102
Shareholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	135,000	135,000
Common stock, issued (in shares)	103,664	102,668
Common stock, outstanding (in shares)	94,528	95,972
Treasury stock, at cost (in shares)	9,136	6,696

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The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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