Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Cost	$ 2,907,248	$ 2,560,618
Accumulated depreciation	(1,740,196)	(1,589,915)
Total	1,167,052	970,703
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	70,079	51,315
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	605,448	562,785
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 2,231,721	$ 1,946,518

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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