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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) Parenthetical (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
CONDENSED CONSOLIDATED BALANCE SHEETS Parenthetical [Abstract]
Accumulated depreciation, depletion and amortization	$ 948,112	$ 930,515

- Definition

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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