Property, Plant And Equipment, Net (Schedule Of Property, Plant And Equipment, Net) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment, Net [Abstract]
Land and land improvements	$ 620,940	$ 594,866
Mineral reserves and interests	421,820	351,543
Buildings	111,796	108,266
Machinery and equipment	2,407,045	2,420,759
Construction in progress	127,091	92,841
Gross property, plant and equipment	3,688,692	3,568,275
Less allowances for depreciation, depletion and amortization	(1,914,401)	(1,880,445)
Net property, plant and equipment	$ 1,774,291	$ 1,687,830

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, as of the balance sheet date, of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure, such as interior masonry, interior flooring, electrical, and plumbing.

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- Definition

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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