Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property and Equipment
Total Property and Equipment	$ 468,938	$ 437,397
Accumulated depreciation	(275,389)	(263,584)
Property and equipment, net	193,549	173,813
Land and land interests [Member]
Property and Equipment
Total Property and Equipment	25,871	18,134
Building and leasehold improvements [Member]
Property and Equipment
Total Property and Equipment	126,431	109,077
Equipment and other [Member]
Property and Equipment
Total Property and Equipment	$ 316,636	$ 310,186

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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