Property Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	$ 301,250	$ 306,720
Accumulated depreciation	(196,825)	(191,508)
Total property, plant and equipment, net	104,425	115,212
Building and improvements [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	57,435	57,512
Machinery and equipment [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	218,359	224,611
Furniture and fixtures [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	1,999	2,445
Forklifts and Tractors [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	5,373	5,095
Computer equipment [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	7,371	5,774
Construction in process [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	1,855	2,425
Land [Member]
Summary of Property, plant and equipment
Property, Plant and Equipment, Gross	$ 8,858	$ 8,858

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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