Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Cost	$ 2,844,606	$ 2,674,577
Accumulated depreciation	(1,758,455)	(1,673,707)
Total	1,086,151	1,000,870
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	63,033	54,113
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	613,150	586,538
Machinery, equipment and other [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 2,168,423	$ 2,033,926

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.

+ References+ Details

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.

+ References+ Details

- 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.

+ References+ Details