Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property and equipment
Total cost	$ 165,585	$ 165,393
Accumulated depreciation and amortization	(48,653)	(45,543)
Property and equipment, net	116,932	119,850
Land and land improvements [Member]
Property and equipment
Total cost	4,133	4,133
Buildings [Member]
Property and equipment
Total cost	30,389	30,364
Machinery, equipment and tooling [Member]
Property and equipment
Total cost	106,139	103,477
Leasehold improvements [Member]
Property and equipment
Total cost	7,696	7,696
Furniture and fixtures [Member]
Property and equipment
Total cost	941	941
Information systems [Member]
Property and equipment
Total cost	1,070	1,070
Construction in progress [Member]
Property and equipment
Total cost	$ 15,217	$ 17,712

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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