Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment
Gross property, plant and equipment	$ 3,296,155	$ 3,275,728
Less: Accumulated depreciation	(2,050,975)	(2,001,244)
Property, plant and equipment, net	1,245,180	1,274,484
Land
Property, Plant and Equipment
Gross property, plant and equipment	26,387	26,729
Land improvements
Property, Plant and Equipment
Gross property, plant and equipment	21,014	17,960
Buildings and improvements
Property, Plant and Equipment
Gross property, plant and equipment	190,725	186,799
Machinery and equipment
Property, Plant and Equipment
Gross property, plant and equipment	2,966,973	2,977,521
Uncompleted construction
Property, Plant and Equipment
Gross property, plant and equipment	$ 91,056	$ 66,719

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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