Property, Plant and Equipment (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Property, Plant and Equipment
Property, plant and equipment, gross	$ 938,508	$ 910,695
Less: Accumulated depreciation	631,019	604,899
Property, plant and equipment, net	307,489	305,796
Land [Member]
Property, Plant and Equipment
Property, plant and equipment, gross	34,404	32,775
Building [Member]
Property, Plant and Equipment
Property, plant and equipment, gross	206,559	201,866
Machinery and Equipment [Member]
Property, Plant and Equipment
Property, plant and equipment, gross	678,499	663,642
Construction in Progress [Member]
Property, Plant and Equipment
Property, plant and equipment, gross	$ 19,046	$ 12,412

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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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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