Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Cost	$ 2,910,151	$ 2,907,248
Accumulated depreciation	(1,768,674)	(1,740,196)
Total	1,141,477	1,167,052
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	66,330	70,079
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	603,731	605,448
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 2,240,090	$ 2,231,721

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 of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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