Property and Equipment, Net (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,197,912	$ 1,201,180	$ 1,232,678
Accumulated depreciation and depletion	733,296	727,573	731,420
Property and equipment, net	464,616	473,607	501,258
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	124,892	120,342	124,621
Quarry property [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	173,055	174,231	172,140
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	81,325	85,655	89,209
Equipment and vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	772,800	778,443	807,267
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 45,840	$ 42,509	$ 39,441

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, 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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