Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of property, plant and equipment
Property, plant and equipment	$ 128,547	$ 126,980
Less: accumulated depreciation	(89,392)	(86,059)
Property, plant and equipment, net	39,155	40,921
Work in progress [Member]
Schedule of property, plant and equipment
Property, plant and equipment	868	966
Buildings and improvements [Member]
Schedule of property, plant and equipment
Property, plant and equipment	12,952	12,963
Machinery and equipment [Member]
Schedule of property, plant and equipment
Property, plant and equipment	111,148	109,500
Land and improvements [Member]
Schedule of property, plant and equipment
Property, plant and equipment	$ 3,579	$ 3,551

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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