Property Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of Property, plant and equipment
Gross Property, plant and equipment	$ 192,817	$ 190,621
Accumulated depreciation	(139,767)	(133,730)
Net Property, plant and equipment	53,050	56,891
Land and land improvements [Member]
Components of Property, plant and equipment
Gross Property, plant and equipment	3,467	3,337
Buildings and building improvements [Member]
Components of Property, plant and equipment
Gross Property, plant and equipment	25,351	24,704
Machinery, equipment, furniture and fixtures [Member]
Components of Property, plant and equipment
Gross Property, plant and equipment	160,356	156,595
Construction in progress [Member]
Components of Property, plant and equipment
Gross Property, plant and equipment	$ 3,643	$ 5,985

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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