Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property and Equipment
Total property and equipment	$ 470,176	$ 473,865
Accumulated depreciation	(277,537)	(276,567)
Property and equipment, net	192,639	197,298
Land and land interests [Member]
Property and Equipment
Total property and equipment	25,879	26,124
Building and leasehold improvements [Member]
Property and Equipment
Total property and equipment	136,497	137,293
Equipment and other [Member]
Property and Equipment
Total property and equipment	$ 307,800	$ 310,448

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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