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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accumulated depreciation on property, plant and equipment	$ 662,068	$ 658,990
Accumulated amortization on acquired intangibles assets	$ 82,530	$ 91,542

- 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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