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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 27, 2013	Dec. 26, 2012
Assets [Abstract]
Accumulated depreciation	$ 252,687	$ 250,173
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)	104,341	103,764
Common stock, outstanding (in shares)	92,465	92,229
Treasury stock, at cost (in shares)	11,876	11,535

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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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