Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
Property, Plant and Equipment	$ 294,910	$ 286,949
Accumulated Depreciation	(208,717)	(199,795)
Property, Plant and Equipment, Net	86,193	87,154
Depreciation	18,072	18,088	18,026
Land
Property, Plant and Equipment
Property, Plant and Equipment	4,294	4,383
Buildings and improvements
Property, Plant and Equipment
Property, Plant and Equipment	52,597	49,931
Machinery and manufacturing equipment
Property, Plant and Equipment
Property, Plant and Equipment	140,330	135,794
Office equipment
Property, Plant and Equipment
Property, Plant and Equipment	88,814	86,740
Work in progress
Property, Plant and Equipment
Property, Plant and Equipment	$ 8,875	$ 10,101

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

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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