Property, Plant, and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 79,124	$ 74,437
Less: accumulated depreciation	(47,380)	(44,841)
Property, Plant and Equipment, Net, Total	31,744	29,596
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,951	3,951
Building [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	18,371	18,371
Building Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	11,723	10,632
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,327	4,038
Computer hardware and software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	25,763	23,595
Manufacturing test equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	11,522	10,093
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 3,467	$ 3,757

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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