Equipment, Property and Improvements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Composition of the Partnership's equipment, property and improvements
Total equipment, property and improvements	$ 1,425,968	$ 1,471,830
Accumulated depreciation and amortization	(888,919)	(892,391)
Equipment, property and improvements, net	537,049	579,439
Land [Member]
Composition of the Partnership's equipment, property and improvements
Total equipment, property and improvements	18,745	18,742
Buildings and improvements [Member]
Composition of the Partnership's equipment, property and improvements
Total equipment, property and improvements	793,655	787,714
Equipment Furniture and Fixtures [Member]
Composition of the Partnership's equipment, property and improvements
Total equipment, property and improvements	$ 613,568	$ 665,374

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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